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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 3265. Отображено 100.
26-07-2012 дата публикации

Microstructured transmission optical fiber

Номер: US20120186304A1
Автор: Dana Craig Bookbinder, Ming-Jun Li, Pushkar Tandon, Scott Robertson Bickham
Принадлежит: Corning Inc

Microstructured optical fiber for single-moded transmission of optical signals, the optical fiber including a core region and a cladding region, the cladding region including an annular void-containing region that contains non-periodically disposed voids. The optical fiber provides single mode transmission and low bend loss.

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Номер записи: 1
21-02-2013 дата публикации

Coupled multicore fiber

Номер: US20130044988A1
Автор: Katsuhiro Takenaga, Shoji Tanigawa
Принадлежит: Fujikura Ltd

A coupled multi-core fiber 10 includes a plurality of cores 11 and a clad 12 surrounding the plurality of cores 11, wherein the plurality of cores 11 are arranged in such a way that periphery surfaces of the adjacent cores 11 contact with each other, each of the cores 11 is made to have a refractive index higher than the clad 12 and includes: an outer region 16 having a predetermined thickness from the periphery surface; and an inner region 15 made to have a higher refractive index than the outer region 16 and surrounded by the outer region 16.

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Номер записи: 2
28-02-2013 дата публикации

Method for producing optical fiber having controlled perturbations

Номер: US20130047676A1
Автор: Anping Liu, Charles Frederick Laing, Eric John Mozdy, Joseph Doull Thaler, Ming-Jun Li, Xin Chen
Принадлежит: Corning Inc

A method for producing an optical fiber is provided. The method includes the steps of drawing an optical fiber from a heated glass source in a furnace and introducing index perturbations to the optical fiber via a plurality of perturbation sources arranged at a plurality of different azimuthal locations. The index perturbations are introduced synchronously at different locations along the axial length of the fiber by the plurality of perturbation sources in a generally helical pattern on the outside surface of the fiber in one embodiment. According to another embodiment, the index perturbations are introduced by the plurality of perturbation sources at different frequencies.

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Номер записи: 3
02-05-2013 дата публикации

Methods and systems for predicting an optical fiber performance parameter

Номер: US20130110463A1
Автор: John A. Fee
Принадлежит: VERIZON BUSINESS GLOBAL LLC

A method for predicting polarization mode dispersion (PMD) in an installed optical fiber. Values of PMD are measured for a first optical fiber at various points in time during the manufacture and installation of the first optical fiber. Values of PMD are identified that correspond to sensitive ones of the various points in time. A set of correlation coefficients is calculated based on the values of PMD corresponding to the sensitive ones of the various points in time. An installed value of PMD for a second optical fiber is predicted based on the set of correlation coefficients.

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Номер записи: 4
18-07-2013 дата публикации

Tapered optical fiber for supercontinuum generation

Номер: US20130182999A1
Автор: Carsten L. Thomsen, Christian Jacobsen, Ole Bang, Peter Morten Moselund, Simon Toft Sorensen
Принадлежит: NKT PHOTONICS AS

The invention relates to a tapered optical fiber and a method and drawing tower for producing such an optical fiber. The tapered optical fiber comprising a core region that is capable of guiding light along a longitudinal axis of said optical fiber and a cladding region surrounding said core region. The optical fiber comprises a tapered section arranged between a first longitudinal position and a second longitudinal position, said tapered section comprising a first taper section having a first length, L 1 , over which the optical fiber is tapered down to a taper waist, and a second taper section having a second length, L 2 , over which said optical fiber is tapered up.

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Номер записи: 5
02-01-2014 дата публикации

Multi-Core Optical Fibers for IR Image Transmission

Номер: US20140003776A1
Автор: Daniel J. Gibson, Ishwar D. Aggarwal, Jasbinder S. Sanghera, Leslie Brandon Shaw
Принадлежит: US Department of Navy

An optical fiber comprising non-silica, specialty glass that has multiple fiber cores arranged in a square registered array. The fiber cores are “registered” meaning that the array location of any fiber core is constant throughout the entire length of the fiber, including both ends. Optical fiber bundles are fabricated by combining multiple multi-core IR fibers with square-registration. Also disclosed is the related method for making the optical fiber.

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Номер записи: 6
23-01-2014 дата публикации

Methods for Making a Graded-Index Multimode Preform and Fiber

Номер: US20140020431A1
Автор: Christian Genz, Lothar Brehm, Wolfgang Haemmerle
Принадлежит: J Fiber GmbH

Methods for making a preform for a graded-index multimode fiber by using an inside deposition process are disclosed. The methods are characterized by an iterative refractive index profile correction with the following steps: determining a target refractive index profile for the preform to be produced, carrying out an inside deposition process with fixed volume flows for the reacting gases inside a tube and a given burner speed for all deposited layers, collapsing the tube and measuring the actual refractive index profile, comparing the target profile with the actual profile and calculating a correction value of index differences, converting this correction value in corrected burner speeds as varying process parameter, carrying out a inside deposition process with fixed gas flows and corrected burner speeds for all layers to be deposited.

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Номер записи: 7
13-03-2014 дата публикации

Fiber Geometrical Management for TEM00 Mode Pulse Energy Scaling of Fiber Lasers and Amplifiers

Номер: US20140071521A1
Автор: Jian Liu
Принадлежит: PolarOnyx Inc

Methods and systems for managing pulse energy scaling are disclosed, including generating electromagnetic radiation; coupling the electromagnetic radiation to a fiber geometrical management system comprising: a tapered fiber comprising: an elliptical or rectangular core centrally positioned within a single or double cladding shell, wherein the core comprises a fiber material and a doped gain medium; an input face wherein the doped core comprises a major axis and a minor axis, wherein the ratio of the major to minor axis at the input face ranges from about 1 to about 100; an output face wherein the doped core comprises a major axis and a minor axis, wherein the ratio of the major to minor axis at the output face ranges from about 1 to about 100; and wherein the major (minor) axis is adiabatically or linearly tapered from the input face to the output face. Other embodiments are described and claimed.

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Номер записи: 8
07-01-2016 дата публикации

Method for manufacturing preform for photonic band gap fiber, method for manufacturing photonic band gap fiber, preform for photonic band gap fiber, and photonic band gap fiber

Номер: US20160002089A1
Автор: Kunimasa Saitoh, Shoichiro Matsuo
Принадлежит: Fujikura Ltd, Hokkaido University NUC

A photonic band gap fiber 1 includes a hollow core region 10 and a band gap region 27 in a honeycomb shape surrounding the core region 10 and having a plurality of holes 21 formed in a glass body 22 . The holes 21 are surrounded by columnar glass bodies 25 disposed on three alternate apexes of a hexagon HEX and plate glass bodies 26 disposed so as to join the columnar glass bodies 25 to the other three apexes of the hexagon HEX. The columnar glass bodies 25 are disposed in a triangular lattice shape.

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Номер записи: 9
04-01-2018 дата публикации

LOW LOSS OPTICAL FIBERS WITH FLUORINE AND CHLORINE CODOPED CORE REGIONS

Номер: US20180002221A1
Автор: Bookbinder Dana Craig, Li Ming-Jun, Tandon Pushkar
Принадлежит:

A co-doped optical fiber is provided having an attenuation of less than about 0.17 dB/km at a wavelength of 1550 nm. The fiber includes a core region in the fiber having a graded refractive index profile with an alpha of greater than 5. The fiber also includes a first cladding region in the fiber that surrounds the core region. Further, the core region has a relative refractive index of about −0.10% to about +0.05% compared to pure silica. In addition, the core region includes silica that is co-doped with chlorine at about 1.2% or greater by weight and fluorine between about 0.1% and about 1% by weight. 1. An optical fiber , comprising:a fiber having an attenuation of less than about 0.17 dB/km at a wavelength of 1550 nm, the fiber comprising:a core region in the fiber having a graded refractive index profile with an alpha of greater than 0.5; anda first cladding region in the fiber that surrounds the core region,wherein the core region comprises silica co-doped with chlorine at about 1.2% or greater by weight and fluorine between about 0.1% and about 1% by weight.2. The fiber according to claim 1 , wherein the core region has a relative refractive index claim 1 , Δ claim 1 , of about −0.20% to about +0.1% compared to pure silica.3. The fiber according to claim 1 , wherein the first cladding region comprises (a) an inner cladding region that surrounds the core region and has a relative refractive index claim 1 , Δ claim 1 , and (b) a depressed cladding region that surrounds the inner cladding region and has a relative refractive index claim 1 , Δ; the core region has a relative refractive index claim 1 , Δ; and Δ≧Δ>Δ.4. The fiber according to claim 3 , wherein the first cladding region further comprises an outer cladding region having a relative refractive index claim 3 , Δ claim 3 , and further wherein Δ>Δ.5. The fiber according to claim 1 , wherein the core region comprises silica co-doped with chlorine and fluorine claim 1 , the chlorine at about 2.5% or greater ...

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Номер записи: 10
02-01-2020 дата публикации

MULTI OPTICALLY-COUPLED CHANNELS MODULE AND RELATED METHODS OF COMPUTATION

Номер: US20200003948A1
Автор: Cohen Eyal, LONDON Michael, MALKA Dror, SHEMER Amir, Zalevsky Zeev
Принадлежит:

An integrated optical module is provided. The optical module comprises multi optically-coupled channels, and enables the use thereof in an Artificial Neural Network (ANN). According to some embodiments the integrated optical module comprises a multi-core optical fiber, wherein the cores are optically coupled. 1. A method of performing a calculation , the method comprising:{'b': 1', '1', '2, 'providing a multi-core optical fiber of a length L comprising at least two cores configured to enable directional light propagation therein along the multi-core optical fiber, the optical fiber is configured to enable evanescent wave coupling between neighboring cores with a coupling length that is shorter than twice the length L at least for light signals having a first wavelength λ and wherein one or more of the cores are amplification core being configured to amplify the λ light according to a power of a control light signal having a second wavelength λ propagating therethrough;'}{'b': '1', 'transmitting input light signals having selected individual powers and the first wavelength λ into a plurality of cores of the multi-core optical fiber;'}obtaining output light signals emitted from one or more of the cores of the multi-core optical fiber, the powers of said output light signals being a function of the powers of the input light signals, and{'b': '2', 'transmitting control light signals having selected individual powers and the second wavelength λ into one or more of the amplification cores of the multi-core optical fiber, thereby defining said function.'}211221. The method of claim 1 , wherein the one amplification core is configured to amplify a λ light—being light at a first wavelength λ propagating therethrough—by a controllable amplification factor determined by a power of a λ light—being light at a second wavelength λ—propagating therethrough simultaneously with the λ light.321. The method of claim 2 , wherein said λ light has a wavelength of about 980 nm and said λ ...

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Номер записи: 11
08-01-2015 дата публикации

High Power Fiber Laser System with Side Pumping Arrangement

Номер: US20150007615A1
Автор: Berishev Igor, Chuyanov Vadim, Gapontsev Valentin, Strougov Nikolai
Принадлежит:

A twin fiber laser arrangement is configured with active and passive fibers supporting respective signal and pump lights and a reflective coating surrounding the fibers along a section of the arrangement. The passive fiber has regions covered by respective protective layer and coating-free regions alternating with the layer covered regions, wherein the reflective coating is configured to overlap the protective layer which shields the end of the reflective coating from high power pump light. 114-. (canceled)15. A method of manufacturing a twin fiber laser arrangement , comprising:providing a perform having a core doped with rare-earth ions;providing a passive preform with spaced regions covered by a protective layer, thereby alternating covered and uncovered regions;drawing active and passive fibers from respective preforms;joining the active and passive fibers together along the uncovered regions of the passive fiber, thereby forming a plurality of spaced coupling regions between the fibers, the coupling regions each being longer than the uncovered region of the passive fiber; andsurrounding the coupling regions each with a reflective layer, thereby overlapping end portions of each protective layer with respective end portions of the reflective layer.16. The method of claim 15 , wherein providing the passive preform includes:periodically removing the protective layer along a predetermined length of the passive preform so as to provide the uncovered regions; orapplying the protective layer along a predetermined length of the passive preform so as to provide the covered regions, the protective layer including at least one polymer.17. The method of further comprisingwhile drawing, detecting beginning and end of each covered region with the protective layer, andproviding markings on the reflective layer corresponding to the beginning and end of each covered region with the protective layer on the passive fiber.18. The method of claim 17 , wherein the passive and active ...

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Номер записи: 12
12-01-2017 дата публикации

PROCESS OF USING A SUBMERGED COMBUSTION MELTER TO PRODUCE HOLLOW GLASS FIBER OR SOLID GLASS FIBER HAVING ENTRAINED BUBBLES, AND BURNERS AND SYSTEMS TO MAKE SUCH FIBERS

Номер: US20170008795A1
Автор: Charbonneau Mark William, McHugh Kevin Patrick
Принадлежит:

Processes and systems for producing glass fibers having regions devoid of glass using submerged combustion melters, including feeding a vitrifiable feed material into a feed inlet of a melting zone of a melter vessel, and heating the vitrifiable material with at least one burner directing combustion products of an oxidant and a first fuel into the melting zone under a level of the molten material in the zone. One or more of the burners is configured to impart heat and turbulence to the molten material, producing a turbulent molten material comprising a plurality of bubbles suspended in the molten material, the bubbles comprising at least some of the combustion products, and optionally other gas species introduced by the burners. The molten material and bubbles are drawn through a bushing fluidly connected to a forehearth to produce a glass fiber comprising a plurality of interior regions substantially devoid of glass. 1. A process comprising:a) feeding at least one partially or wholly vitrifiable feed material into a feed inlet of a melting zone of a melter vessel comprising a floor, a ceiling, and a wall connecting the floor and ceiling at a perimeter of the floor and ceiling, the melter vessel comprising a feed opening in the wall or ceiling and an exit end comprising a melter exit structure for discharging molten material formed in the melting zone;b) heating the at least one partially or wholly vitrifiable material with at least one burner directing combustion products of an oxidant and a first fuel into the melting zone under a level of the molten material in the zone, one or more of the burners configured to impart heat and turbulence to at least some of the molten material in the melting zone, producing a turbulent molten material comprising a plurality of bubbles suspended in the molten material, the bubbles comprising at least some of the combustion products;c) discharging the molten material comprising bubbles from the melter vessel through the melter exit ...

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Номер записи: 13
10-01-2019 дата публикации

METHOD AND APPARATUS FOR CREATING COHERENT BUNDLE OF SCINTILLATING FIBERS

Номер: US20190010076A1
Автор: BULL Christopher, CRAMER Avilash, Gupta Rajiv, KINGON Angus, MORSE Theodore F., WALTZ Paul
Принадлежит:

A method and apparatus to manufacture a coherent bundle of scintillating fibers is disclosed. A method includes providing a collimated bundle having a glass preform with capillaries therethrough known in the industry as a glass capillary array, and infusing the glass capillary array with a scintillating polymer or a polymer matrix containing scintillating nanoparticles. 1. A method comprising:providing a collimated bundle having a glass preform with a plurality of capillaries therethrough known in the industry as a glass capillary array; andinfusing the glass capillary array with a scintillating polymer or a polymer matrix containing scintillating nanoparticles.2. The method of wherein a low index reflective metal coating is formed as an interfacial layer between the scintillating polymer and the glass cladding.3. The method of further comprising:placing the collimated bundle in a pressure vessel;applying pressure to the high refractive index scintillating polymer or polymer matrix;driving it into the capillaries; andapplying a back pressure to the collimated bundle, the back pressure reducing the risk of failure of the collimated bundle.4. The method of wherein the back pressure is applied by a high pressure gas.5. The method of wherein the transparent scintillating polymer is triphenylbismuth/polyvinylcarbazole claim 1 , or other scintillation polymers with a higher refractive index than the cladding.6. The method of wherein the scintillating polymer contains high refractive index nanoparticles.7. The method of wherein the high refractive index nanoparticles are zirconium dioxide (ZrO2) claim 6 , hafnium dioxide (HfO) or titanium dioxide (TiO)).8. The method of where the cladding glass is optically absorbing to the emitted photons of the scintillating material.9. The method of wherein there is a low refractive claim 8 , transparent interfacial layer between core and cladding claim 8 , with the interfacial layer being less than 1 micron in thickness claim 8 , this ...

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Номер записи: 14
12-01-2017 дата публикации

Spun round core fiber

Номер: US20170010410A1
Автор: Changgeng Ye, Joona Koponen, Ossi Kimmelma
Принадлежит: NLight Inc

Optical waveguide cores having refractive index profiles that vary angularly about a propagation axis of the core can provide single-mode operation with larger core diameters than conventional waveguides. An optical waveguide includes a core that extends along a propagation axis and has a refractive index profile that varies angularly about the propagation axis. The optical waveguide also includes a cladding disposed about the core and extending along the propagation axis. The refractive index profile of the core varies angularly along a length of the propagation axis.

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Номер записи: 15
11-01-2018 дата публикации

SPUN ROUND CORE FIBER

Номер: US20180011243A1
Автор: Kimmelma Ossi, KOPONEN Joona, YE Changgeng
Принадлежит: nLIGHT, Inc.

Optical waveguide cores having refractive index profiles that vary angularly about a propagation axis of the core can provide single-mode operation with larger core diameters than conventional waveguides. In one representative embodiment, an optical waveguide comprises a core that extends along a propagation axis and has a refractive index profile that varies angularly about the propagation axis. The optical waveguide can also comprise a cladding disposed about the core and extending along the propagation axis. The refractive index profile of the core can vary angularly along a length of the propagation axis. 1. An optical waveguide , comprising:a core that extends along a propagation axis, the core having a refractive index profile that varies angularly about the propagation axis; anda cladding disposed about the core and extending along the propagation axis;wherein the refractive index profile of the core varies angularly along a length of the propagation axis.2. The optical waveguide of claim 1 , wherein the refractive index profile of the core varies radially about the propagation axis.3. The optical waveguide of claim 1 , wherein the refractive index profile of the core is periodic along the propagation axis.4. The optical waveguide of claim 1 , wherein the refractive index profile of the core is aperiodic along the propagation axis.5. The optical waveguide of claim 1 , wherein the refractive index profile of the core is configured to attenuate one or more higher order modes.6. The optical waveguide of claim 1 , wherein the refractive index profile of the core is radially asymmetric about the propagation axis.7. The optical waveguide of claim 1 , wherein the refractive index profile of the core is angularly asymmetric about the propagation axis.8. The optical waveguide of claim 1 , wherein the core has a round cross-section.9. The optical waveguide of claim 1 , wherein the core comprises one or more mode-discriminating regions.10. The optical waveguide of claim ...

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Номер записи: 16
15-01-2015 дата публикации

Quartz glass tube as a semi-finished product for an optical component and method for producing said quartz glass tube

Номер: US20150017440A1
Автор: Andreas Langner, Andreas Schultheis, Clemens Schmitt, Gerhard Schötz, Karsten Bräuer, Peter Bauer, Richard Schmidt
Принадлежит: Heraeus Quarzglas GmbH and Co KG

A quartz glass tube as a semi-finished product for an optical component that has an inner bore extending along a tube centre axis for the acceptance of a core rod and a tube wall limited by an inner casing surface and an outer casing surface is already known; within said tube wall an inner region made of a first quartz glass and an outer region made of a second quartz glass with a different index of refraction surrounding the inner region contact one another at a contact surface which runs around the centre axis. In order to provide a quartz glass on this basis that facilitates the production of optical components for special applications such as laser-activated optical components in wand or fibre form, the invention states that the contact surface has a non-round course in the radial cross-section and the inner casing surface has a circular course.

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Номер записи: 17
21-01-2016 дата публикации

METHOD FOR MANUFACTURING BENT OPTICAL FIBER

Номер: US20160016843A1
Автор: KANEUCHI Yasuomi, Mitose Yuuichi
Принадлежит:

The present invention relates to a method for manufacturing a bent optical fiber while suppressing diameter reduction of the optical fiber and realizing a desired radius of curvature thereof. In an optical fiber prepared, a plurality of irradiation regions arranged along the longitudinal direction of the optical fiber are set as a heated section with infrared laser pulsed light. In each irradiation region, the optical fiber is bent at a predetermined angle in a bend processing portion softened by irradiation with the infrared laser pulsed light. The optical fiber is bent in the bend processing portions of all the irradiation regions, thereby obtaining a bent optical fiber having a predetermined radius of curvature in the heated section. 1. A method for manufacturing a bent optical fiber obtained by performing bend processing for an optical fiber comprised of silica glass and having a first end face and a second end face opposed to the first end face , the method comprising:a first bending step of irradiating a first irradiation region of the optical fiber with infrared laser pulsed light in order to partially soften the optical fiber, and, in an irradiation period with the infrared laser pulsed light, bending the optical fiber at a first angle in a first bend processing portion softened by irradiation with the infrared laser pulsed light in the first irradiation region; anda second bending step of irradiating a second irradiation region of the optical fiber different from the first irradiation region with the infrared laser pulsed light in order to partially soften the optical fiber in a portion different from the first bend processing portion, and, in an irradiation period with the infrared laser pulsed light, bending the optical fiber at a second angle in a second bend processing portion softened by irradiation with the infrared laser pulsed light in the second irradiation region,wherein in a heated section of the optical fiber irradiated with the infrared laser ...

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Номер записи: 18
22-01-2015 дата публикации

High bandwidth mmf and method of making

Номер: US20150023642A1
Автор: Kimberly Wilbert Smith, Robert Arnold Knowlton, Scott Robertson Bickham
Принадлежит: Corning Inc

A multimode optical fiber, and a method of making the fiber, are provided according to the following steps and elements: forming a core preform with a graded refractive index that includes silica and an up-dopant; drawing the core preform into a core cane; forming an inner annular segment preform that includes silica soot and an up-dopant surrounding the core cane; and forming a depressed-index annular segment preform that includes silica soot surrounding the inner annular segment preform. The method also includes the steps: forming an outer annular segment preform that includes silica soot and an up-dopant surrounding the depressed-index annular segment preform; doping the inner, depressed-index and outer annular segment preforms simultaneously or nearly simultaneously with a down-dopant; and consolidating the segment preforms simultaneously or nearly simultaneously into inner, depressed-index and outer annular segments.

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Номер записи: 19
28-01-2016 дата публикации

ISOTHERMAL PLASMA CVD SYSTEM FOR REDUCED TAPER IN OPTICAL FIBER PREFORMS

Номер: US20160023939A1
Автор: Alonzo John C., Braganza David D., Brodeur Merrill H., Fleming James W.
Принадлежит:

A chemical vapor deposition (CVD) system is configured to reduce the presence of geometrical and optical taper at the end sections of the preform, or more generally controlling the axial profile of the fabricated optical fiber preform. The system is configured to create an isothermal plasma within the substrate tube, with a relatively confined deposition zone located upstream of the plasma. A reagent delivery system is configured to adjust the composition and concentration of the introduced species in sync with the movement of the plasma and deposition zone within the substrate tube. By synchronizing the movement of the plasma with the adjustable reagent delivery system, it is possible to provide precision control of the axial profile of the created optical fiber preform. 1. Apparatus for providing axial refractive index profile control of layers deposited within an optical fiber preform substrate tube , the apparatus comprisinga chemical vapor deposition (CVD) reactor configured to create an isothermal plasma within a preform substrate tube, and a deposition zone located upstream of the isothermal plasma;an energy source for creating the isothermal plasma, the energy source comprising a radio frequency (RF) coil surrounding the substrate tube and an RF signal source for directing an electrical signal into the RF coil, the RF coil configured to traverse back and forth along at least a portion of an axial extent of the preform substrate tube to provide axial movement of the isothermal plasma and the deposition zone within the substrate tube;a delivery system coupled to the reactor for introducing reagents into the deposition zone within the substrate tube, the delivery system configured to respond to control signals for changing the reagent composition and concentration provided to the substrate tube; anda control system coupled to both the energy source and the delivery system for synchronizing the movement of the RF coil of the energy source with the composition ...

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Номер записи: 20
24-01-2019 дата публикации

ORGANIC-INORGANIC COMPOSITE FIBERS AND METHODS THEREOF

Номер: US20190023603A1
Автор: Decker Heather Bossard, Hart Shandon Dee, Kim Jenny, Li Yanfei, McCarthy Joseph Edward, Smith Nicholas James, Zimmermann James William
Принадлежит:

An organic-inorganic composite, including: a discontinuous phase having a plurality of adjacent and similarly oriented fibers of an inorganic material; and a continuous organic phase having a thermoplastic polymer, such that the continuous organic phase surrounds the plurality of adjacent and similarly oriented fibers of the inorganic material, and the organic-inorganic composite is a plurality of adjacent and similarly oriented fibers of inorganic material contained within a similarly oriented host fiber of the thermoplastic polymer. Also disclosed are methods of making and using the composite. 2. The composite of claim 1 , wherein the inorganic material is an oxide glass having a glass transition temperature of from 200° C. to 450° C. claim 1 , and the organic phase is a thermoplastic polymer.3. The composite of claim 2 , wherein the oxide glass is zinc sulfophosphate claim 2 , and the thermoplastic polymer is selected from a polyetherimide (PEI) claim 2 , a polyethersulfone (PS) claim 2 , a polyimide claim 2 , or mixtures thereof.4. A method of making the organic-inorganic composite of claim 1 , comprising:a first melting at a suitable temperature, a batch of suitable proportions of sources or precursors comprising:15 to 20% zinc oxide;8 to 12% lithium phosphate;4 to 8% zinc pyrophosphate;12 to 16% potassium monophosphate;12 to 16% sodium hexametaphosphate;0.1 to 2% calcium carbonate;0.1 to 2% strontium carbonate;4 to 10% aluminum metaphosphate; and20 to 40% zinc sulfate heptahydrate, based on a 100 weight percent total of the inorganic portion of the composite to produce a product of the first melting; anda second melting of the product of the first melting.5. The method of claim 4 , further comprising: pouring or extruding the product of the first melt into a rod and annealing the rod at to form an annealed ZSP glass rod.6. The method of claim 4 , further comprising: extruding the annealed ZSP glass rod form an extruded and annealed ZSP glass rod.7. The method ...

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Номер записи: 21
23-01-2020 дата публикации

Viscocity-Reducing Dopants In Optical Fibers

Номер: US20200024176A1
Автор: David W. Peckham, Man F. Yan, Patrick W. Wisk
Принадлежит: OFS FITEL LLC

An optical preform manufacturing process is disclosed in which an alkali dopant is deposited between an optical fiber core rod and an optical fiber cladding jacket. Depositing the alkali dopant between the core rod and the cladding jacket permits diffusion of the alkali dopants into the core during fiber draw when the core and the cladding are at their respective transition (or vitrification) temperatures. Introduction of the alkali dopants between the core rod and the cladding jacket also permits decoupling of the alkali doping process from one or more of other optical preform manufacturing processes. The optical preform manufacturing process can also include placing alkali dopants between an optical fiber inner cladding jacket and an optical fiber outer cladding jacket to reduce the glass viscosity during fiber draw.

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Номер записи: 22
29-01-2015 дата публикации

METHOD FOR PRODUCING OPTICAL FIBER

Номер: US20150027170A1
Автор: HARUNA Tetsuya, HIRANO Masaaki, TAMURA Yoshiaki
Принадлежит: Sumitomo Electric Industries, Ltd.

Provided is a method for producing an optical fiber having low attenuation and including a core that contains an alkali metal element. An optical fiber preform that includes a core part and a cladding part is drawn with a drawing apparatus to form an optical fiber , the core part having an average concentration of an alkali metal element of 5 atomic ppm or more and the cladding part containing fluorine and chlorine. The optical fiber includes a glass portion and resin coating portion and the glass portion is under residual stress that is a compressive stress of 130 MPa or less. During the drawing, the time during which an individual position of the optical fiber preform is maintained at 1500° C. or higher is 110 minutes or less. 1. A method for producing an optical fiber , comprising:drawing a silica-based optical fiber preform into an optical fiber, the optical fiber preform including a core part and a cladding part, the core part having an average concentration of an alkali metal element of 5 atomic ppm or more, the cladding part containing fluorine and chlorine, the optical fiber including a glass portion and resin coating portion, and the glass portion being under residual stress which is a compressive stress of 130 MPa or less.2. The method for producing an optical fiber according to claim 1 ,wherein in the drawing of the optical fiber preform, the time during which an individual position of the optical fiber preform is maintained at 1500° C. or higher is 110 minutes or less.3. The method for producing an optical fiber according to claim 1 ,wherein the average concentration of the alkali metal element in the core part of the optical fiber preform is 500 atomic ppm or less.4. The method for producing an optical fiber according to claim 1 ,wherein the core part of the optical fiber preform contains a halogen element, andwherein the average concentration of an additive element other than the alkali metal element or the halogen atom in the core part is equal to or ...

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Номер записи: 23
28-01-2021 дата публикации

SINGLE MODE OPTICAL FIBER AND MANUFACTURING METHOD THEREOF

Номер: US20210026064A1
Автор: KAWASAKI Kiichiro
Принадлежит: Sumitomo Electric Industries, Ltd.

T/C, which is a ratio of an area T of a skirt part outside the boundary to an area C of the core region in a refractive index distribution, is 4% or more and 30% or less, the boundary is defined at a position where an absolute value of a change amount of the index becomes maximum between the center of the core region and the outer peripheral part of the first clad region, the area C of the core region is defined in a range from the center of the core region to the boundary in the radial direction, the area T of the skirt part is defined in a range from the boundary to the outer peripheral part of the first clad region. 1. A single mode optical fiber having a refractive index distribution in which a refractive index continuously changes at a boundary between a core region and a first clad region , the singe mode optical fiber comprising:the core region whose maximum refractive index is n1;the first clad region provided on an outer peripheral side of the core region and having a refractive index smaller than the refractive index n1; anda second clad region provided on an outer peripheral side of the first clad region and having a refractive index greater than a refractive index of an outer peripheral part of the first clad region, whereinT/C, which is a ratio of an area T of a skirt part outside the boundary to an area C of the core region in the refractive index distribution, is 4% or more and 30% or less,the boundary, in the refractive index distribution, is defined at a position where an absolute value of a change amount in a radial direction of the refractive index becomes maximum between the center of the core region and the outer peripheral part of the first clad region,the area C of the core region, in the refractive index distribution, is defined by an area between a refractive index straight line of the first clad region and a straight line of an average refractive index of the core region in a range from the center of the core region to the boundary in the ...

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Номер записи: 24
04-02-2016 дата публикации

OPTICAL FIBER MICROWIRE DEVICES AND MANUFACTURE METHOD THEREOF

Номер: US20160033721A1
Автор: CHEN Mingyang
Принадлежит:

Herein presents an optical fiber microwire device, wherein the device comprising a silica tube, an optical fiber (2) inserted into the silica tube (1) and pigtailed at two sides, wherein the two ends of the silica tube (1) are fused with the optical fiber (2) to form a solid structure, or the two ends of the silica tube (2) are filled with silica rods (3), silica capillaries (4) or segments of optical fibers and fused to form a solid structure. The silica tube (1) together with the optical fiber (2) inside is then tapered to form a micro structure region. Therefore, the micro structure region is consisted of the tapered optical fiber as the microstructure core, tapered silica tube, and the air in between. This invention combine the manufacture of optical fiber microwire and the sealing process, avoiding the disadvantages of the conventional tapered optical fiber microwire, such as fragile mechanical structure, and sensitive to the outer environment variations. 1. Herein presents an optical fiber microwire device , wherein the device comprising a silica tube , an optical fiber inserted into the silica tube and pigtailed at two sides , wherein the two ends of the silica tube are fused with the optical fiber to form a solid structure , or the two ends of the silica tube are filled with silica rods , silica capillaries or segments of optical fibers and fused to form a solid structure. The silica tube together with the optical fiber inside is then tapered to form a micro structure region. Therefore , the micro structure region is consisted of the tapered optical fiber as the microstructure core , tapered silica tube , and the air in between.2. An optical fiber microwire device as claimed in claim 1 , in which the optical fiber is tapered to form a pre-tapered region claim 1 , then it is placed in the silica tube with all the pre-tapered region inside of the silica tube claim 1 , and after the two ends of the silica tube are fused to form fixed structure claim 1 , then ...

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Номер записи: 25
04-02-2021 дата публикации

Tension-based methods for forming bandwidth tuned optical fibers for bi-modal optical data transmission

Номер: US20210032153A1
Автор: Kangmei Li, Ming-Jun Li, Snigdharaj Kumar Mishra, Xin Chen
Принадлежит: Corning Inc

Methods of forming a bandwidth-tuned optical fiber for short-length data transmission systems include establishing a relationship between a change Δτ in a modal delay τ, a change ΔT in a draw tension T and a change Δλ in a BM wavelength λ of light in a BM wavelength range from 840 nm and 1100 nm for a test optical fiber drawn from a preform and that supports BM operation at the BM wavelength. The methods also include drawing from either the preform or a closely related preform the bandwidth-tuned optical fiber by setting the draw tension based on the established relationships of the aforementioned parameters so that the bandwidth-tuned optical fiber has a target bandwidth greater than 2 GHz·km at a target wavelength within the BM wavelength range.

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Номер записи: 26
12-02-2015 дата публикации

OPTICAL FIBER GLASS BASE MATERIAL MANUFACTURING METHOD AND OPTICAL FIBER GLASS BASE MATERIAL

Номер: US20150040616A1
Автор: NAKAJIMA Hitoshi
Принадлежит: SHIN-ETSU CHEMICAL CO., LTD.

Provided is an optical fiber glass base material manufacturing method that includes flame polishing an outside of a starting base material that includes a core and a first cladding with an oxyhydrogen flame and then arranging a glass fine particle synthesis burner facing the starting base material, which rotates, moving the starting base material and the burner back and forth relative to each other along the starting base material, and depositing glass fine particles produced by hydrolysis of glass raw material in the oxyhydrogen flame as a porous glass layer of a second cladding, the method comprising synthesizing and depositing the glass fine particles under conditions in which a hydrogen flow rate during a first back and forth deposition pass performed immediately after supply of raw material is started is greater than a normal hydrogen flow rate. 1. An optical fiber glass base material manufacturing method that includes flame polishing an outside of a starting base material that includes a core and a first cladding with an oxyhydrogen flame and then arranging a glass fine particle synthesis burner facing the starting base material , which rotates , moving the starting base material and the burner back and forth relative to each other along the starting base material , and depositing glass fine particles produced by hydrolysis of glass raw material in the oxyhydrogen flame as a porous glass layer of a second cladding , the method comprising:synthesizing and depositing the glass fine particles under conditions in which a hydrogen flow rate during a first back and forth deposition pass performed immediately after supply of raw material is started is greater than a normal hydrogen flow rate.2. The optical fiber glass base material manufacturing method according to claim 1 , whereinthe hydrogen flow rate during the first back and forth deposition pass performed immediately after the supply of raw material is started is 4% to 35% greater than the normal hydrogen flow ...

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Номер записи: 27
11-02-2016 дата публикации

PHOTONIC BAND GAP FIBERS USING A JACKET WITH A DEPRESSED SOFTENING TEMPERATURE

Номер: US20160041333A1
Автор: Aggarwal Ishwar D., Gibson Daniel J., Kung Frederic H., Sanghera Jasbinder S.
Принадлежит:

The present invention is generally directed to a photonic bad gap fiber and/or fiber preform with a central structured region comprising a first non-silica based glass and a jacket comprising a second non-silica based glass surrounding the central structured region, where the Littleton softening temperature of the second glass is at least one but no more than ten degrees Celsius lower than the Littleton softening temperature of the first glass, or where the base ten logarithm of the glass viscosity in poise of the second glass is at least 0.01 but no more than 2 lower than the base ten logarithm of the glass viscosity in poise of the first glass at a fiber draw temperature. Also disclosed is a method of making a photonic bad gap fiber and/or fiber preform 1. A photonic band gap fiber preform , comprising:a central structured region comprising a first non-silica based glass, wherein the first glass has a Littleton softening temperature; anda jacket comprising a second non-silica based glass, wherein the second glass comprises a different composition than the first glass, wherein the jacket surrounds the central structured region, and wherein the second glass has a Littleton softening temperature;wherein the Littleton softening temperature of the second glass is at least one but no more than ten degrees Celsius lower than the Littleton softening temperature of the first glass.2. The fiber preform of claim 1 , wherein the first glass and second glass are individually selected from the group consisting of chalcogenide glass claim 1 , chalcohalide glass claim 1 , oxide glass claim 1 , silicate glass claim 1 , germanate glass claim 1 , phosphate glass claim 1 , borate glass claim 1 , gallate glass claim 1 , tellurite glass claim 1 , and halide glass.3. The fiber preform of claim 1 , wherein when the fiber preform is heated claim 1 , the second glass flows into and fills any voids between the central structured region and the jacket.4. The fiber preform of claim 1 , ...

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Номер записи: 28
12-02-2015 дата публикации

Methods for producing a semifinished part for the manufacture of an optical fiber which is optimized in terms of bending

Номер: US20150043880A1
Автор: Jörg Kötzing, Lothar Brehm, Matthias Auth
Принадлежит: J Plasma GmbH

Methods for producing a semifinished part for the manufacture of an optical fiber are disclosed. The methods are optimized in terms of bending. The methods include the steps of providing a shell tube with a shell refractive index which is lower in relation to the light-conducting core. Then, at least one protective, intermediate and/or barrier layer is applied to a radially outermost and/or innermost tube surface of the respective shell tube, wherein a build-up of light-conducting layers is realized on the inner side and/or the outer side of the shell tube. Finally, the shell tubes are joined by collapsing so as to form the semifinished part.

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Номер записи: 29
16-02-2017 дата публикации

METHOD AND DEVICE FOR GENERATING A DIAMETER-ENLARGED END ON AN OPTICAL FIBER

Номер: US20170044047A1
Автор: Ashraf Naim, Bognar Lajos, Kuka Georg, Sittner Julia
Принадлежит: fiberware Generalunternehmen für Nachrichtentechninik GmbH

A method for generating a diameter-enlarged end on an optical fiber, includes placing a longitudinal subsection of a longitudinal section of the fiber into a heating zone and heating the longitudinal subsection, wherein first and second sides of the longitudinal section on either side of the longitudinal subsection are situated outside the heating zone; compressing the heated longitudinal subsection in a longitudinal direction of the optical fiber; pushing the first side of the longitudinal section toward the heating zone in the longitudinal direction and pulling the second side of the longitudinal section away from the heating zone in the longitudinal direction, wherein the first side of the longitudinal section is pushed to a greater degree than the second side of the longitudinal section is pulled, and generating an optical entry surface of the fiber by cutting the enlarged longitudinal subsection transversely to the longitudinal direction of the fiber. 1. A method for generating a diameter-enlarged end on an optical fiber , comprising:placing a longitudinal subsection of a longitudinal section of the fiber into a heating zone and heating the longitudinal subsection, wherein first and second sides of the longitudinal section on either side of the longitudinal subsection are situated outside the heating zone;compressing the heated longitudinal subsection in a longitudinal direction of the optical fiber;pushing the first side of longitudinal section toward the heating zone in the longitudinal direction and pulling the second side of the longitudinal section away from the heating zone in the longitudinal direction, wherein the first side of the longitudinal section is pushed to a greater degree than the second side of the longitudinal section is pulled, andgenerating an optical entry surface of the fiber by cutting the enlarged longitudinal subsection transversely to the longitudinal direction of the fiber.2. The method of claim 1 , further comprising grinding and ...

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Номер записи: 30
26-02-2015 дата публикации

ALL GLASS METHOD FOR FRUSTRATING INTERNAL REFLECTION IN AN OPTICAL FIBER

Номер: US20150055922A1
Автор: McMaster Brian, Staloff Daniel
Принадлежит:

The disclosure is directed to an all glass method that frustrates the internal reflection on the outside diameter of an optical fiber's glass cladding thus allowing the light to be directed to a light absorbing material/ medium and allowing the desired light in the core of the fiber to be preserved with no loss. The frustration is achieved by having at least one glass frustrater in glass-to-glass contact with the outermost cladding layer of the optical fiber. The glass frustrater is made of a glass that has a glass transition point lower that both the core and cladding glasses of the fiber. Chalcogenide and phosphate glasses are among the glasses suitable for this application. 1. A method for frustrating the light in the cladding of a glass optical fiber by redirecting said light , the method comprising the steps of:providing an optical fiber having a glass core and one or a plurality of glass cladding layers overlaying said core; andforming one or a plurality of shaped glass frustrater(s) on the outermost cladding layer of said fiber;wherein said glass frustrater(s) is/are in glass-to-glass contact with and bonded to the outermost cladding layer of said optical fiber, and light entering the glass frustrater from the cladding is redirected to a light absorbing medium.2. The method according to claim 1 , wherein the frustrater(s) is/are formed on the optical fiber by placing the optical fiber in a mold having a cavity for forming the selected shape(s) claim 1 , injecting a glass having a glass transition temperature lower than the glass transition temperature of both the glass core and the one or plurality of cladding layers claim 1 , and cooling the injected glass in the mold to thereby form the selected frustrater(s) in contact with and bonded to the outermost cladding layer of said optical fiber.3. The method according to claim 1 , wherein the frustrater(s) is/are formed by bonding the frustrater to the outermost cladding layer using a glass frit material having a ...

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Номер записи: 31
26-02-2015 дата публикации

METHOD FOR CONNECTING MULTI-CORE FIBER, MULTI-CORE FIBER, AND METHOD FOR MANUFACTURING MULTI-CORE FIBER

Номер: US20150055923A1
Автор: IMAMURA Katsunori, Saito Tsunetoshi, Watanabe Kengo
Принадлежит:

A multicore fiber includes a plurality of cores disposed at predetermined intervals and surrounded by a cladding . The multicore fiber also includes a marker formed apart from the cores . The refractive index of the marker is different from those of the cores and the cladding . For example, the marker may be made of a material having lower refractive index than that of the cladding . In this case, for example, the cores may be made of germanium-doped quartz. The cladding may be made of pure quartz. The marker may be made of fluorine-doped quartz. Further, the marker may be an empty hole. 1. A method for fusion splicing a multicore fiber in which at least one of objects to be spliced together is a multicore fiber including a plurality of core portions , a cladding portion surrounding the plurality of core portions , and a marker portion disposed apart from the plurality of core portions , the method comprising:disposing the multicore fiber to face an object to be spliced that includes a marker corresponding to the marker portion;determining a position of each of the core portions of the multicore fiber by use of the marker portion, and conducting rotation core alignment of the position with a position of a desired core portion of the object to be spliced; andfusing the multicore fiber with the object to be spliced.2. The method of claim 1 , wherein at least one marker portion is disposed at a position shifted from an arbitrary line-symmetric axis with respect to a disposition of the plurality of core portions on a cross-sectional surface of the multicore fiber.3. The method of claim 1 , wherein two or more types of the marker portions are provided claim 1 , and some or all of the marker portions are positioned substantially perpendicularly to each other on a cross-sectional surface of the multicore fiber.4. The method of claim 1 , wherein the multicore fiber and the object to be spliced are fused together by discharges of three electrodes disposed in three directions ...

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Номер записи: 32
13-02-2020 дата публикации

HALOGEN CO-DOPED OPTICAL FIBERS

Номер: US20200049881A1
Автор: Bookbinder Dana Craig, Dawes Steven Bruce, Diep Phong, Harper Brian Lee, Tandon Pushkar
Принадлежит:

A method of forming an optical fiber, including: exposing a soot core preform to a dopant gas at a pressure of from 1.5 atm to 40 atm, the soot core preform comprising silica, the dopant gas comprising a first halogen doping precursor and a second halogen doping precursor, the first halogen doping precursor doping the soot core preform with a first halogen dopant and the second halogen precursor doping the soot core preform with a second halogen dopant; and sintering the soot core preform to form a halogen-doped closed-pore body, the halogen-doped closed-pore body having a combined concentration of the first halogen dopant and the second halogen dopant of at least 2.0 wt %. 1. A method of forming an optical fiber , comprising:exposing a soot core preform to a dopant gas at a pressure of from 1.5 atm to 40 atm, the soot core preform comprising silica, the dopant gas comprising a first halogen doping precursor and a second halogen doping precursor, the first halogen doping precursor doping the soot core preform with a first halogen dopant and the second halogen precursor doping the soot core preform with a second halogen dopant; andsintering the soot core preform to form a halogen-doped closed-pore body, the halogen-doped closed-pore body having a combined concentration of the first halogen dopant and the second halogen dopant greater than 2.0 wt %.2. The method of claim 1 , wherein the first halogen dopant is Cl.3. The method of claim 2 , wherein the Cl dopant has a halogen co-doping ratio in a range from 20% to 90% in the halogen-doped closed-pore body.4. The method of claim 2 , wherein the second halogen dopant is Br.5. The method of claim 1 , wherein the combined concentration of the first halogen dopant and the second halogen dopant is in the range from 3.0 wt % to 8.0 wt %.6. The method of claim 1 , wherein the exposing of the soot core preform is performed at a temperature of from 1300° C. to 1550° C.7. The method of claim 1 , wherein the soot core preform is ...

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Номер записи: 33
10-03-2022 дата публикации

METHOD OF MAKING AN IMAGING FIBRE APPARATUS AND OPTIAL FIBRE APPARATUS WITH DIFFERENT CORE

Номер: US20220073406A1
Автор: Stone James
Принадлежит: University of Bath

A method of forming an imaging fibre apparatus comprises arranging rods to form a plurality of stacks each comprising a respective plurality of rods, wherein: for each stack, the respective plurality of rods comprises rods having different core sizes, the rods of different core sizes being arranged in a selected arrangement, and the rods of different core sizes being arranged such that each stack has a respective selected shape; wherein the selected shape or shapes are such that the stacks stack together in a desired arrangement; the method further comprising: drawing each of the plurality of stacks; stacking together the plurality of drawn stacks together in the desired arrangement to form a further stack; drawing the further stack; and using the drawn further stack to form an imaging fibre apparatus, wherein the selected arrangement of the rods in each stack and the selected shape or shapes of the stacks are such that the further stack comprises a repeating pattern of rods of different core sizes. 1. A method of forming an imaging fibre apparatus comprising:arranging rods to form a plurality of stacks each comprising a respective plurality of rods, wherein:for each stack, the respective plurality of rods comprises rods having different core sizes, the rods of different core sizes being arranged in a selected arrangement, and the rods of different core sizes being arranged such that each stack has a respective selected shape;wherein the selected shape or shapes are such that the stacks stack together in a desired arrangement;the method further comprising:drawing each of the plurality of stacks;stacking together the plurality of drawn stacks together in the desired arrangement to form a further stack;drawing the further stack; andusing the drawn further stack to form an imaging fibre apparatus,wherein the selected arrangement of the rods in each stack and the selected shape or shapes of the stacks are such that the further stack comprises a repeating pattern of rods ...

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Номер записи: 34
10-03-2022 дата публикации

Hollow core optical fiber with controlled diameter hollow regions and apparatus for making the same

Номер: US20220073407A1
Автор: Brian Mangan, David J Digiovanni, Gabriel Puc, Matt Corrado, Robert S Windeler
Принадлежит: OFS FITEL LLC

An apparatus for fabricating a hollow core optical fiber with a controllable core region (in terms of diameter) is based upon regulating conditions (gas flow, volume, and/or temperature) within the hollow core region during the fiber draw process. The introduction of a gas, or any change in volume or temperature of the hollow core region, allows for the diameter of the hollow core region to self-regulate as a multistructured core rod (MCR) is drawn down into the final hollow core optical fiber structure. This self-regulation provides a core region having a diameter that selected and then stabilized for the duration of the draw process. The inventive apparatus is also useful in controlling the diameter of any selected hollow region of an MCR including, but not limited to, shunts and corner capillaries disposed around the core region.

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Номер записи: 35
02-03-2017 дата публикации

Method of manufacturing multi-mode optical fiber

Номер: US20170057864A1
Автор: Kazuhiro Yonezawa, Saori KUBARA, Tomohiro Ishihara
Принадлежит: Sumitomo Electric Industries Ltd

A method of manufacturing multi-mode optical fiber is disclosed. The method of manufacturing includes: a step of forming a first glass base material while controlling a supply rate of an additive for adjusting a refractive index to achieve a desired refractive index distribution; a step of drawing the first glass base material; a step of measuring a residual stress distribution in a radial direction of the multi-mode optical fiber after being drawn; a step of readjusting the supply rate of the additive in accordance with deviation of a refractive index, acquired from the residual stress distribution measured, from the desired refractive index distribution; a step of forming a second glass base material while supplying the additive at the supply rate after being readjusted; and a step of drawing the second glass base material.

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Номер записи: 36
10-03-2022 дата публикации

OPTICAL FIBER WITH VARIABLE ABSORPTION

Номер: US20220077643A1
Автор: Muendel Martin H., Petit Vincent
Принадлежит:

An optical fiber may comprise a core doped with one or more active ions to guide signal light from an input end of the optical fiber to an output end of the optical fiber, a cladding surrounding the core to guide pump light from the input end of the optical fiber to the output end of the optical fiber, and one or more inserts formed in the cladding surrounding the core. The core may have a geometry (e.g., a cross-sectional size, a helical pitch, and/or the like) that varies along a longitudinal length of the optical fiber, which may cause an absorption of the pump light to be modulated along the longitudinal length of the optical fiber. 1. An optical fiber , comprising:a core doped with one or more active ions to guide signal light from an input end of the optical fiber to an output end of the optical fiber;a cladding surrounding the core to guide pump light from the input end of the optical fiber to the output end of the optical fiber; and wherein the core has a geometry that varies along a longitudinal length of the optical fiber, and', 'wherein the geometry of the core is varied along the longitudinal length of the optical fiber to cause an absorption of the pump light to be modulated along the longitudinal length of the optical fiber., 'one or more inserts formed in the cladding surrounding the core,'}2. The optical fiber of claim 1 , wherein the geometry of the core that varies along the longitudinal length of the optical fiber comprises a cross-sectional size of the core that increases from the input end to the output end of the optical fiber.3. The optical fiber of claim 2 , wherein the cross-sectional size of the core increases from the input end to the output end of the optical fiber to cause the absorption of the pump light to increase along the longitudinal length of the optical fiber.4. The optical fiber of claim 2 , wherein at least one insert of the one or more inserts has a first refractive index claim 2 , wherein the cladding surrounding the core has ...

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Номер записи: 37
28-02-2019 дата публикации

Optical Fiber

Номер: US20190063962A1
Автор: Andrew Simon Webb, Christopher EMSLIE, Laurence James Cooper
Принадлежит: Fibercore Ltd

There is provided an optical fiber for providing increased sensitivity in sensing applications by increasing the Rayleigh backscatter coefficient of the fiber while maintaining tolerable levels of signal attenuation (e.g., less than 20% over 10 km). Such an optical fiber comprises a core, a first cladding layer and a second cladding layer. The core comprises at least one core dopant selected from the range of: germanium, phosphorus, aluminium, boron, fluorine. The at least one core dopant is used to increase the core refractive index and enhance the core Rayleigh backscatter coefficient. The first cladding layer comprises at least one dopant selected from: germanium, phosphorus, aluminium, boron, fluorine; wherein at least one first cladding layer dopant is used to reduce the first cladding layer refractive index. The signal attenuation generated in the fiber is less than 20% over 1 km.

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Номер записи: 38
10-03-2016 дата публикации

Multicore optical fiber and optical module

Номер: US20160070058A1
Автор: Eisuke Sasaoka, Takashi Sasaki, Tetsuya Hayashi, Tetsuya Nakanishi
Принадлежит: Sumitomo Electric Industries Ltd

The present invention relates to an MCF with a structure for enabling an alignment work with higher accuracy. The MCF has a plurality of cores and a cladding. An outer peripheral shape of the cladding in a cross section of the MCF is comprised of a circumferential portion forming a circumference coincident with an outer periphery of the MCF, and a cut portion. The cut portion has a bottom portion and two contact portions provided on both sides of the bottom portion and projecting more than the bottom portion. When a side face of the MCF is viewed, the two contact portions have flattened faces and the flattened faces of the two contact portions extend along a longitudinal direction of the MCF with the bottom portion in between.

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Номер записи: 39
27-02-2020 дата публикации

FIBER COATINGS WITH LOW PULLOUT FORCE

Номер: US20200064546A1
Автор: Chien Ching-Kee, Tandon Pushkar, Tandon Ruchi
Принадлежит:

An optical fiber includes an outer diameter less than 220 μm, a glass fiber that includes a glass core and a glass cladding, a primary coating, and a secondary coating. The glass cladding surrounds and is in direct contact with the glass core. The primary coating surrounds and is in direct contact with the glass fiber. The primary coating can have a Young's modulus less than 0.5 MPa and a thickness less than 30.0 μm. The secondary coating surrounds and is in direct contact with the primary coating. The secondary coating can have a thickness less than 27.5 m. A pullout force of the optical fiber can be less than a predetermined threshold when in an as-drawn state. The pullout force may increase by less than a factor of 2.0 upon aging the primary and secondary coatings on the glass fiber for at least 60 days. 2. The optical fiber of claim 1 , wherein the Young's modulus of the primary coating is less than 0.3 MPa.3. The optical fiber of claim 1 , wherein the pullout force is less than 0.90 lb/cm.4. The optical fiber of claim 1 , wherein the pullout force increases by less than a factor of 1.6 upon aging the optical fiber for at least 60 days.5. The optical fiber of claim 1 , wherein a tear strength of the primary coating is greater than 30 J/m.6. The optical fiber of claim 1 , wherein a tensile toughness of the primary coating is greater than 500 kJ/m.7. The optical fiber of claim 1 , wherein the outer diameter of the optical fiber is less than 200 μm.8. The optical fiber of claim 1 , wherein the thickness of the primary coating is less than 20 μm.9. The optical fiber of claim 1 , wherein the secondary coating has a thickness of less than 20 μm.10. The optical fiber of claim 1 , wherein the primary coating thickness and the secondary coating thickness are each less than 20 μm.11. The optical fiber of claim 1 , wherein a ratio of the thickness of the primary coating to the thickness of the secondary coating is between 0.7 and 1.25.12. The optical fiber of claim 1 , ...

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Номер записи: 40
17-03-2016 дата публикации

PRODUCTION METHOD OF OPTICAL FIBER PREFORM, AND PRODUCTION METHOD OF OPTICAL FIBER

Номер: US20160075590A1
Автор: Gonda Tomohiro, IMAMURA Katsunori, Miyabe Ryo, Sugizaki Ryuichi
Принадлежит: FURUKAWA ELECTRIC CO., LTD.

A production method of an optical fiber preform includes first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms, and first arranging a second cladding portion to surround the first preform. At the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles. The first preform and the burner are moved relative to each other in a longitudinal direction of the first preform. The glass particles are deposited on the first preform. 1. A production method of an optical fiber preform , the method comprising:first preparing a first preform having a plurality of glass preforms and a first cladding portion disposed between the plurality of glass preforms; andfirst arranging a second cladding portion to surround the first preform, whereinat the first arranging, a material gas and a combustion gas are ejected from a burner to produce glass particles,the first preform and the burner are moved relative to each other in a longitudinal direction of the first preform, andthe glass particles are deposited on the first preform.2. The production method of the optical fiber preform according to claim 1 , wherein the first cladding portion is disposed so that a cross section of the first preform is close to a round shape.3. The production method of the optical fiber preform according to claim 1 , wherein the first preparing includes second arranging a center glass preform as one of the plurality of glass preforms claim 1 , third arranging an outer periphery glass preform as another one of the plurality of glass preforms on an outer periphery of the center glass preform claim 1 , and fourth arranging the first cladding portion in which a material gas and a combustion gas are ejected from a burner to produce glass particles claim 1 , the center glass preforms and the burner are moved relative to each other in a longitudinal direction of the center glass ...

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Номер записи: 41
17-03-2016 дата публикации

OPTICAL FIBERS AND PREFORMS WITH ONE STEP FLUORINE TRENCH AND OVERCLAD AND METHODS FOR MAKING THE SAME

Номер: US20160075591A1
Автор: Bookbinder Dana Craig, Li Ming-Jun, Stone Jeffery Scott, Tandon Pushkar
Принадлежит:

A method is provided that includes: forming a low-index trench region with a first density; forming an inner barrier layer comprising silica around the trench region at a second density greater than the first density; depositing silica-based soot around the first barrier layer to form an overclad region at a third density less than the second density; inserting a core cane into a trench-overclad structure; forming an outer barrier layer comprising silica in an outer portion of the overclad region at a fourth density greater than the third density; flowing a down dopant-containing gas through the trench-overclad structure to dope the trench region with the down dopant, and wherein the barrier layers mitigate diffusion of the down-dopant into the overclad region; and consolidating the trench-overclad and the core cane. 1. A method for forming an optical fiber preform , comprising:depositing silica-based soot on a bait rod to form a low-index trench region, wherein the silica-based soot is deposited such that the trench region has a first density;forming an inner barrier layer comprising silica around the trench region, wherein the inner barrier layer has a second density greater than the first density;depositing silica-based soot around the first barrier layer to form an overclad region of the optical fiber preform at a third density, wherein the second density is greater than the third density;removing the bait rod from a central channel of a trench-overclad structure that comprises the trench region, the inner barrier layer and the overclad region;inserting a core cane into the central channel of the trench-overclad structure after the step for removing the bait rod;forming an outer barrier layer comprising silica in an outer portion of the overclad region, wherein the outer barrier layer has a fourth density greater than the third density;flowing a down dopant-containing gas through the central channel of the trench-overclad structure after the step for inserting ...

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Номер записи: 42
16-03-2017 дата публикации

POLARIZATION-MAINTAINING OPTICAL FIBRE AND PREFORM AND METHOD FOR PRODUCING THE SAME

Номер: US20170075147A1
Автор: Brehm Lothar, Gutsche Thomas, Hämmerle Wolfgang, Hanf Robert
Принадлежит:

The invention relates to a method for producing a polarization-maintaining optical fibre, consisting of a core region and stress-generating elements embedded in the fibre body, having the following method steps: producing a core preform for the core region using internal deposition on a substrate tube, the internally coated substrate tube subsequently being collapsed, generating recesses on the core preform by virtue of the material on the outer surface of the core preform being removed parallel to the longitudinal axis of the core preform at diametrically opposed positions, filling the recesses with stress-generating rods, with the tightest possible rod packing, in a freely selectable first filling geometry, possibly filling the recesses in addition with non-stress-generating rods in a second filling geometry, sheathing the filled core preform with a jacketing tube, preparing the sheathed core preform for a fibre-drawing process, and drawing the sheathed arrangement to form in the optical fibre. A preform for producing a polarization-maintaining optical fibre contains a core preform, having a core region and a lateral region, and also contains a jacketing tube, which encloses the core preform, as well as stress-generating elements contained in the lateral region, wherein the stress-generating elements are provided in the form of recesses in the lateral region, wherein the recesses are filled with doped rods and/or undoped rods, and wherein the rod filling forms a first and/or a second arrangement geometry. 12. A method for producing a polarization-maintaining optical fiber , consisting of a core region and stress applying parts () embedded in the fiber body , comprising the following method steps:{'b': '6', 'producing recesses () in the form of circular sectors on the cross-sectional area of a core preform by removing the material on the outer surface in parallel to the longitudinal axis of the core preform at positions located diametrically opposite to one another ...

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Номер записи: 43
18-03-2021 дата публикации

FIBER PREFORM, OPTICAL FIBER, METHODS FOR FORMING THE SAME, AND OPTICAL DEVICES HAVING THE OPTICAL FIBER

Номер: US20210080644A1
Автор: Huang Xiaosheng, Yoo Seongwoo
Принадлежит:

According to embodiments of the present invention, a fiber preform or an optical fiber is provided. The fiber preform or the optical fiber includes a core region having a plurality of cores, wherein two cores of the plurality of cores are bridged by an air gap, and a cladding arrangement including a first cladding region having a plurality of structures surrounding the core region, and a second cladding region in between the core region and the first cladding region, the second cladding region having a plurality of tubes, wherein at least one split is defined in the second cladding region. According to further embodiments of the present invention, a method for forming the fiber preform, a method for forming the optical fiber, an optical coupler having the optical fiber, an optical combiner having the optical fiber, and an optical apparatus having the optical fiber are also provided. 1. A fiber preform or an optical fiber comprising:a core region comprising a plurality of cores, wherein two cores of the plurality of cores are bridged by an air gap; and a first cladding region comprising a plurality of structures surrounding the core region, and', 'a second cladding region in between the core region and the first cladding region, the second cladding region comprising a plurality of tubes, wherein at least one split is defined in the second cladding region., 'a cladding arrangement comprising2. The fiber preform or the optical fiber as claimed in claim 1 , wherein the air gap is defined offset from a center of the core region.3. The fiber preform or the optical fiber as claimed in claim 1 , wherein the at least one split extends through the second cladding region entirely in a direction from the core region to the first cladding region.4. The fiber preform or the optical fiber as claimed in claim 1 , wherein the at least one split extends in a radial direction from a core of the plurality of cores to the first cladding region.5. The fiber preform or the optical fiber ...

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Номер записи: 44
24-03-2016 дата публикации

PROCESS FOR FABRICATION OF YTTERBIUM DOPED OPTICAL FIBER

Номер: US20160083284A1
Автор: Saha Maitreyee, Sen Ranjan
Принадлежит:

The present invention provides a process for fabrication of ytterbium (Yb) doped optical fiber through vapor phase doping technique. The method comprises deposition of Al2O3 and Yb2O3 in vapor phase simultaneously in combination with silica during formation of sintered core layer. This is followed by collapsing at a high temperature in stepwise manner to produce the preform and drawing of fibers of appropriate dimension. The process parameters have been optimized in such a way that Al and Yb-chelate compounds can be transported to the reaction zone without decomposition and condensation of precursor materials. Thus variations of dopants concentration along the length of the preform have been minimized to <1% and good repeatability of the process has also been achieved. The resulting fibers also have smooth core-clad boundary devoid of any star-like defect. The process can be reliably adopted for fabrication of large core Yb doped optical fibers. The fibers also show low loss, negligible center dip and good optical properties suitable for their application as fiber lasers. 1. A process for fabrication of ytterbium (Yb) doped optical fiber through vapor phase doping technique , said process comprising the steps of:depositing pure silica cladding layers inside a silica glass substrate tube at a temperature in the range of 1900 to 1980° C. using MCVD process;{'sub': 3', '3, '(ii) sublimating AlCland Yb(thd)in their respective sublimator chamber at a temperature in the range of 100 to 170° C. and 180 to 260° C. respectively to obtain Al-precursors and Yb-precursors;'}(iii) introducing preheated Helium in the sublimator chamber of step (ii) at a flow rate in the range of 10 to 50 sccm for Al precursors and 100 to 300 sccm for Yb precursors;(iv) transporting Al and Yb precursors with Helium obtained in step (iii) to the substrate tube with the adjustment of temperature of a ribbon burner in the range of 180-370° C.;{'sub': 2', '4', '4', '2, '(v) passing Ogas into a ...

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Номер записи: 45
26-03-2015 дата публикации

METHOD FOR MANUFACTURING OPTICAL FIBER BASE MATERIAL AND OPTICAL FIBER BASE MATERIAL

Номер: US20150086784A1
Автор: Imoto Katsuyuki, ISHII FUTOSHI
Принадлежит: KOHOKU KOGYO CO., LTD.

The present invention provides a method for manufacturing an optical fiber base material and an optical fiber base material, the method including: arranging a rod containing SiOfamily glass for core, in a container; pouring a SiOglass raw material solution for cladding layer and a hardener into the container, the glass raw material solution containing a hardening resin; solidifying the glass raw material solution through a self-hardening reaction; and then drying the solidified material and heating the solidified material in chlorine gas, to manufacture an optical fiber base material in which a SiOcladding layer is formed in an outer periphery of the rod containing SiOfamily glass for core. 1. A method for manufacturing an optical fiber base material , comprising:{'sub': '2', 'arranging a rod containing SiOfamily glass for core in a center of a container;'}{'sub': '2', 'pouring a SiOglass raw material solution for cladding layer and a hardener into the container;'}solidifying the glass raw material solution through a self-hardening reaction;then removing the container from the solidified material; and{'sub': 2', '2, 'drying the solidified material and heating the solidified material in chlorine gas, to manufacture an optical fiber base material in which a SiOcladding layer is formed in an outer periphery of the rod containing SiOfamily glass for core.'}2. The method for manufacturing the optical fiber base material according to claim 1 , further comprising:{'sub': '2', 'arranging a plurality of metal rods in the container such that the metal rods surround the outer periphery of the rod containing SiOfamily glass for core placed in the container;'}{'sub': '2', 'then pouring the hardening-resin-containing SiOglass raw material solution for cladding layer and the hardener into the container; and'}{'sub': '2', 'removing the container and the metal rods from the solidified material, to form a plurality of empty holes in the SiOcladding layer.'}3. A method for ...

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Номер записи: 46
12-03-2020 дата публикации

Technique For Fabricating A Multistructure Core Rod Used In Formation Of Hollow Core Optical Fibers

Номер: US20200079680A1
Автор: Corrado Matt, DiGiovanni David J, Kremp Tristan, Mangan Brian, Puc Gabriel, Windeler Robert S
Принадлежит: OFS FITEL, LLC

A process of fabricating the microstructure core rod preform used in the fabrication of a hollow core optical fiber includes the step of applying external pressure to selected hollow regions during the drawing of the preform from the initial assembly of capillary tubes. The application of pressure assists the selected hollow regions in maintaining their shape as much as possible during draw, and reduces distortions in the microstructure cells in close proximity to the core by controlling glass distribution during MCR draw. 1. A method for fabricating a microstructure core rod comprising the steps ofarranging a plurality of capillary tubes in a matrix of a preform assembly;drawing the preform assembly into the microstructure core rod by heating and collapsing the plurality of capillary tubes to fuse together, wherein during the drawing step, performing the step ofapplying an external pressure to one or more selected hollow regions in the preform assembly sufficient to control glass distribution among the fusing capillary tubes.2. The method as defined in wherein the preform assembly is arranged as a photonic bandgap assembly byremoving a plurality of centrally-located capillary tubes to define a hollow core region of a predetermined size, defined as an N-pitch cladding diameter, where N is the number of capillary tubes removed across a central axis of the assembly; andinserting a core tube within the hollow core region.3. The method as defined in wherein the external pressure is applied to a hollow core region and controlled to create a core size of a predetermined ratio of final diameter to original N-pitch cladding diameter.4. The method as defined in wherein the selected hollow regions comprise a set of cells surrounding and contacting the hollow core region claim 2 , each cell defined by a pair of nodes contacting the core tube and a strut extending between the pair of nodes.5. The method as defined in wherein the external pressure is applied to the hollow core ...

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Номер записи: 47
25-03-2021 дата публикации

Wavelength Flexibility through Variable-Period Poling of Optical Fiber

Номер: US20210088718A1
Автор: Keyser Christian
Принадлежит:

A fiber laser system includes a high power pump laser, an optical fiber that is aligned to receive output from the high power pump laser. The fiber laser system includes a first pair of orthogonally opposed, periodic electrode structures longitudinally aligned on opposite first and second sides of the optical fiber. The fiber laser system includes a controller that is communicatively coupled to the first pair of periodic electrode structures. The controller performs variable period poling of the first pair of periodic electrode structures to achieve quasi-phase matching (QPM). 1. A fiber laser system comprising:a high power pump laser;an optical fiber that is aligned to receive output from the high power pump laser;a first pair of orthogonally opposed, periodic electrode structures aligned on opposite first and second sides of the optical fiber; anda controller communicatively coupled to the first pair of periodic electrode structures and that performs dynamically adjustable period poling of the first pair of periodic electrode structures to achieve quasi-phase matching (QPM) with wavelength agility.2. The fiber laser system of claim 1 , further comprising:a seed laser that emits one of a seed laser beam at one of a signal wavelength and an idler wavelength; andan optical combiner that combines the output from the high power pump laser and the seed laser, wherein the fiber laser system is configured as an optical parametric amplifier (OPA).3. The fiber laser system of claim 1 , further comprising two opposing mirrors positioned on opposite axial sides of the optical fiber to form an optical cavity claim 1 , wherein the fiber laser system is configured as an optical parametric oscillator (OPO).4. The fiber laser system of claim 1 , wherein the optical fiber comprise a nonlinear optical crystal that generates an output containing a signal and an idler claim 1 , wherein the fiber laser system is configured as an optical parametric generator (OPG).5. The fiber laser ...

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Номер записи: 48
21-03-2019 дата публикации

A METHOD FOR MANUFACTURING A PREFORM FOR OPTICAL FIBERS

Номер: US20190084865A1
Автор: Adigrat Antonio, COCCHINI FRANCO, Gonnet Cedric, Krabshuis Gertjan, Milicevic Igor, SCHIAFFO ANTONIO, Van Stralen Mattheus Jacobus Nicolaas
Принадлежит:

The present invention relates to a method for manufacturing a preform for optical fibers, which method comprises the sequential steps of: i) deposition of non-vitrified silica layers on the inner surface of a hollow substrate tube; ii) deposition of vitrified silica layers inside the hollow substrate tube on the inner surface of the non-vitrified silica layers deposited in step i); iii) removal of the hollow substrate tube from the vitrified silica layers deposited in step ii) and the non-vitrified silica layers deposited in step i) to obtain a deposited tube; iv) optional collapsing said deposited tube obtained in step iii) to obtain a deposited rod comprising from the periphery to the center at least one inner optical cladding and an optical core; v) preparation of an intermediate layer by the steps of: *deposition of non-vitrified silica layers on the outside surface of the deposited tube obtained in step iii) or deposited rod obtained in step iv) with a flame hydrolysis process in an outer reaction zone using glass-forming precursors, and subsequently; *drying and consolidating said non-vitrified silica layers into a vitrified fluorine-doped silica intermediate cladding layer; and *in case preceding step iv) was omitted collapsing; to C provide a solid rod comprising from the periphery to the center the intermediate layer, at least one inner optical cladding and an optical core; wherein a fluorine-comprising gas is used during the deposition and/or drying and/or consolidating and wherein the intermediate layer has a ratio between the outer diameter of the intermediate cladding layer (C) to the outer diameter of the optical core (A) that is at least 3.5; vi) deposition of natural silica on the outside surface of the intermediate cladding layer of the solid rod obtained in step v) by melting natural silica particles in an outer deposition zone to produce an outer cladding whereby a preform is obtained. 1. A method for manufacturing a preform for optical fibers , ...

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Номер записи: 49
19-03-2020 дата публикации

METHOD FOR MAKING AN OPTICAL FIBER DEVICE FROM A 3D PRINTED PREFORM BODY AND RELATED STRUCTURES

Номер: US20200087194A1
Автор: COREY CHRISTOPHER A., Lee Susanne M.
Принадлежит:

A method for making an optical fiber device may include using a three-dimensional (3D) printer to generate a preform body including an optical material. The preform body may have a 3D pattern of voids therein defining a 3D lattice. The method may further include drawing the preform body to form the optical fiber device. 132-. (canceled)33. An optical fiber preform comprising:a preform body to be drawn into a fiber optic device and comprising an optical material;the preform body comprising a plurality of helical strands having a three-dimensional (3D) pattern of voids therein defining a 3D lattice.34. The optical fiber preform of wherein the plurality of helical strands comprises a plurality of counter-rotating claim 33 , helical strands.35. The optical fiber preform of wherein the plurality of helical strands comprises a plurality of intersecting claim 33 , counter-rotating claim 33 , helical strands.36. The optical fiber preform of comprising a coating on at least a portion of the preform body comprising a different material than the optical material.37. The optical fiber preform of wherein the coating comprises an electroplated coating.38. The optical fiber preform of wherein the coating comprises gold.39. The optical fiber preform of wherein at least one of the plurality of helical strands comprises a metal.40. The optical fiber preform of wherein the metal comprises tungsten.41. The optical fiber preform of wherein the optical material comprises at least one of silicon carbide and aluminum oxide.42. The optical fiber preform of wherein the preform body has an elongate shape.43. An optical fiber preform comprising:a preform body to be drawn into a fiber optic device and comprising an optical material;the preform body comprising a plurality of strands defining a three-dimensional (3D) lattice with a 3D pattern of voids therein, and at least some of the voids opening outwardly along a side of the preform body.44. The optical fiber preform of wherein the plurality ...

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Номер записи: 50
19-03-2020 дата публикации

HALOGEN DOPED OPTICAL FIBERS

Номер: US20200087195A1
Автор: Dawes Steven Bruce, Tandon Pushkar
Принадлежит:

A method of forming an optical fiber preform includes: flowing a silicon halide and an oxidizer inside of a substrate tube, wherein a molar ratio of the silicon halide to the oxidizer is from about 1.5 to about 5.0; applying a plasma to the substrate tube to heat the substrate tube to a temperature of from about 1000° C. to about 1700° C.; and depositing silica glass comprising a halogen inside the substrate tube. 1. A method of forming an optical fiber preform , comprising:flowing a silicon halide and an oxidizer inside of a substrate tube, wherein a molar ratio of the silicon halide to the oxidizer is from 1.5 to 4.0;applying energy to form a plasma from the silicon halide and the oxidizer, the plasma heating an inside surface of the substrate tube to a temperature of from about 1000° C. to about 1700° C.; anddepositing silica glass from a reaction of the silicon halide and the oxidizer on the inside surface of the substrate tube, the silica glass comprising a halogen derived from the silicon halide.2. The method of claim 1 , wherein the oxidizer comprises O.3. The method of claim 1 , wherein the silicon halide comprises fluorine.4. The method of claim 1 , wherein the silicon halide comprises bromine.5. The method of claim 1 , wherein the silicon halide comprises chlorine.6. The method of claim 1 , wherein the silica glass comprises a concentration of the halogen of from about 2.0 wt % to about 7.0 wt %.7. The method of claim 1 , further comprising flowing a second silicon halide inside of the substrate tube.8. A method of forming an optical fiber preform claim 1 , comprising:{'sub': 2', '2, 'flowing a silicon halide and Oinside of a substrate tube, wherein a molar ratio of the silicon halide to Ois greater than 1.5;'}{'sub': '2', 'applying energy to form a plasma from the silicon halide and the O, the plasma heating an inside surface of the substrate tube to a temperature of from about 1000° C. to about 1700° C.; and'}{'sub': '2', 'depositing silica glass from a ...

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Номер записи: 51
06-04-2017 дата публикации

APPARATUS AND METHOD FOR PRODUCING CORE ROD OF OPTICAL FIBER

Номер: US20170096362A1
Автор: CHEN Jinwen, JIANG Xinli, QIAN Benhua, XU Xikai, Zhou Hui
Принадлежит:

A method for producing a depressed-cladding core rod of an ultra-low water peak optical fiber, the method including 1) producing a core rod component; 2) producing an inner cladding casing component; 3) disposing the core rod hollow shaft and the casing hollow shaft respectively in the glass lathe; 4) cutting off connections among a pressure controlling pipe, a scrubber, and a vacuum pump; 5) connecting the inner cladding casing to the core rod hollow shaft hermetically; 6) turning on the glass lathe; 7) transporting a first mixture gas to the core rod hollow shaft; 8) moving a high temperature heat source; 9) transporting a second mixture gas to the core rod hollow shaft; 10) transporting the first mixture gas to the core rod hollow shaft; 11) transporting the first mixture gas under certain conditions; and 12) controlling relevant parameters to fuse the inner cladding casing with the core layer rod. 1. A method for producing depressed cladding core rod of an ultra-low water peak optical fiber , the method comprising:1) producing a core rod component: using a glass lathe to fuse and splice a core layer rod and a core rod hollow shaft together;2) producing an inner cladding casing component: using the glass lathe to fuse and splice an inner cladding casing and a casing hollow shaft together, wherein an inner diameter of the inner cladding casing is at least 0.3 mm larger than an outer diameter of the core layer rod;3) disposing the core rod hollow shaft and the casing hollow shaft respectively in two chucks of the glass lathe, wherein a distance between the inner cladding casing and the core layer rod is 0.15 to 5 mm;4) cutting off connections among a pressure controlling pipe, a scrubber, and a vacuum pump, then connecting the core rod hollow shaft to an external gas pipe via a rotary joint, and then connecting the casing hollow shaft to the scrubber;5) connecting the inner cladding casing to the core rod hollow shaft hermetically;6) turning on the glass lathe, ...

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Номер записи: 52
06-04-2017 дата публикации

Optical fiber with large effective area and low bending loss

Номер: US20170097465A1
Автор: Dana Craig Bookbinder, Hazel Benton Matthews, III, Ming-Jun Li, Pushkar Tandon, Snigdharaj Kumar Mishra
Принадлежит: Corning Inc

An optical fiber with large effective area, low bending loss and low attenuation. The optical fiber includes a core, an inner cladding region, and an outer cladding region. The core region includes a spatially uniform updopant to minimize low Rayleigh scattering and a relative refractive index and radius configured to provide large effective area. The inner cladding region features a large trench volume to minimize bending loss. The core may be doped with Cl and the inner cladding region may be doped with F.

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Номер записи: 53
13-04-2017 дата публикации

METHOD OF MANUFACTURING OPTICAL FIBER PREFORM AND OPTICAL FIBER PREFORM

Номер: US20170101334A1
Автор: HARUNA Tetsuya, HIRANO Masaaki, Kawaguchi Yuki, TAMURA Yoshiaki
Принадлежит: Sumitomo Electric Industries, Ltd.

The present invention relates to a method of manufacturing an optical fiber preform for obtaining an optical fiber with low transmission loss. A core preform included in the optical fiber preform comprises three or more core portions, which are each produced by a rod-in-collapse method, and in which both their alkali metal element concentration and chlorine concentration are independently controlled. In two or more manufacturing steps of the manufacturing steps for each of the three or more core portions, an alkali metal element is added. As a result, the mean alkali metal element concentration in the whole core preform is controlled to 7 atomic ppm or more and 70 atomic ppm or less. 1. A method of manufacturing an optical fiber preform which comprises a first core portion including an alkali metal element , a second core portion surrounding the first core portion , a third core portion surrounding the second core portion , and a cladding portion surrounding the third core portion and further having a refractive index lower than each refractive index of the first to third core portions , the method comprising:a first doping step of doping an alkali metal element into an inner surface of a first glass pipe with a mean chlorine concentration of 10 atomic ppm or more and 600 atomic ppm or less;a first collapse step of collapsing the first glass pipe after the first doping step by heating, thereby producing a first intermediate rod from the first glass pipe;a first diameter-reduction step comprising removing an outer peripheral portion of the first intermediate rod to produce a first core rod constituting a part of the first core portion, the first core rod having a diameter smaller than a diameter of the first intermediate rod;a second doping step of doping an alkali metal element into an inner surface of a second glass pipe with the mean chlorine concentration of 10 atomic ppm or more and 600 atomic ppm or less;a second collapse step of integrating the first core rod ...

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Номер записи: 54
13-04-2017 дата публикации

METHOD TO PREVENT CRACKS IN OPTICAL FIBER PREFORMS

Номер: US20170101335A1
Автор: Chludzinski Paul Andrew, Fiordimalva Dominick
Принадлежит:

The present disclosure provides optical fiber preforms formed from core canes having large core-clad ratio, intermediate core-cladding assemblies, and methods for making the preforms and core cladding assemblies. The preforms are made with capped core canes. The capping material has a coefficient of thermal expansion less than the coefficient of thermal expansion of the core cane and more closely matched to or lower than the coefficient of thermal expansion of the surrounding cladding monolith in a cane-in-soot process. Presence of the cap reduces stresses that arise from differential thermal expansion of the core cane and cladding materials and leads to preforms having low defect concentration and low probability of failure during subsequent thermal processing steps. 1. A core-cladding assembly comprising:a porous soot cladding monolith, said porous soot cladding monolith including a first porous cladding glass layer surrounding an internal cavity, said porous soot cladding monolith comprising a first material having a first coefficient of thermal expansion;a first glass body having a portion positioned in said internal cavity, said first glass body comprising a second material having a second coefficient of thermal expansion, said second coefficient of thermal expansion differing from said first coefficient of thermal expansion; anda second glass body having a portion positioned in said internal cavity, said second glass body comprising a third material having a third coefficient of thermal expansion, said third coefficient of thermal expansion differing from said second coefficient of thermal expansion.2. The core-cladding assembly of claim 1 , wherein said first material comprises silica.3. The core-cladding assembly of claim 1 , wherein said second material comprises silica containing a dopant.4. The core-cladding assembly of claim 3 , wherein said first glass body has a core-clad ratio of at least 0.70.5. The core-cladding assembly of claim 1 , wherein said ...

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Номер записи: 55
13-04-2017 дата публикации

METHOD OF ASSEMBLING OPTICAL FIBER PREFORMS

Номер: US20170101339A1
Автор: Luo Xiaoming, Zhou Chunfeng
Принадлежит:

The present disclosure provides optical fiber preforms formed from core canes having large core-clad ratio, intermediate core-cladding assemblies, and methods for making the preforms and core cladding assemblies. The preforms are made from core canes having a contoured end surface. The contoured end surface(s) include a depression that acts to reduce the stress that develops at the junction of the end surface of the core cane with a soot cladding monolith arising from differences in the coefficient of thermal expansions of the core can and soot cladding monolith. The contoured end surface(s) leads to preforms having low defect concentration and low probability of failure during fiber draw. 1. A core-cladding assembly comprising:a porous soot cladding monolith, said porous soot cladding monolith including a first porous cladding glass layer surrounding an internal cavity, said porous soot cladding monolith having a first coefficient of thermal expansion, said internal cavity including a first entrance;a consolidated glass body positioned in said internal cavity, said consolidated glass body having a second coefficient of thermal expansion and a first end surface within said internal cavity, said first end surface facing said first entrance and including a first depression.2. The core-cladding assembly of claim 1 , wherein said consolidated glass body comprises doped silica.3. The core-cladding assembly of claim 1 , wherein said first porous cladding glass layer is in direct contact with said consolidated glass body.4. The core-cladding assembly of claim 2 , wherein said consolidated glass body has a core-clad ratio of at least 0.70.5. The core-cladding assembly of claim 1 , wherein said second coefficient of thermal expansion is greater than said first coefficient of thermal expansion.6. The core-cladding assembly of claim 1 , wherein said first depression has an ellipsoidal claim 1 , conical claim 1 , hemispherical claim 1 , annular claim 1 , cylindrical claim 1 , ...

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Номер записи: 56
23-04-2015 дата публикации

Barbell Optical Fiber And Method Of Making The Same

Номер: US20150110452A1
Автор: DiGiovanni David J., ROCKWELL David A., Shkunov Vladimir, Trevor Dennis J.
Принадлежит:

High aspect ratio core optical fiber designs, which could be semi-guiding, including a core region having a first refractive index and a high aspect ratio elongated cross-section along a slow axis direction, are described. An internal cladding having a second refractive index sandwiches the core and acts as a fast-axis signal cladding. The core has an edge region at both of its short edges that is in contract with edge-cladding regions having a barbell shape. The refractive index of the core regions, the refractive index of the internal claddings, and the refractive index of the edge-cladding regions, are selected so as to maximize the optical power of a lowest-order mode propagating in the fiber core, and to minimize the optical power of the next-order modes in the fiber core. A process to fabricate such a high aspect ratio core fiber is also provided. 1. A method of making a high aspect ratio core optical fiber preform , comprising:forming a near-net rectangular shape core region of a first composition and having an elongated cross-section with a wide slow-axis dimension and a narrow fast-axis direction;forming a pair of near-net shape cladding elements having a second composition;disposing the pair of near-net shape cladding elements adjacent to each slow-axis edge of the core region to form a pair of edge-cladding regions, the combination exhibiting a barbell configuration; andsurrounding the combination of the near-net rectangular shape core region and the pair of near-net shape cladding elements with an outer cladding of a third composition.2. The method of wherein the second composition is different from the first composition.3. The method of wherein the second composition is the same as the first composition claim 1 , forming a semi-guiding high aspect ratio core optical fiber preform.4. The method of wherein at least one of the pair of near-net shape cladding elements comprises a solid rod.5. The method of wherein at least one of the pair of near-net shape ...

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Номер записи: 57
21-04-2016 дата публикации

Low Loss Optical Fiber And Method Of Making The Same

Номер: US20160109651A1
Автор: David W. Peckham, Dennis J. Trevor, Jorgen Ostgaard Olsen, Man F. Yan, Ole A. Levring, Patrick W. Wisk, Peter I. Borel, Rasmus V.S. Jensen
Принадлежит: OFS FITEL LLC

The core region of an optical fiber is doped with chlorine in a concentration that allows for the viscosity of the core region to be lowered, approaching the viscosity of the surrounding cladding. An annular interface region is disposed between the core and cladding and contains a concentration of fluorine dopant sufficient to match the viscosity of the core. By including this annular stress accommodation region, the cladding layer can be formed to include the relatively high concentration of fluorine required to provide the desired degree of optical signal confinement (Le., forming a “low loss” optical fiber).

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Номер записи: 58
02-06-2022 дата публикации

Wavelength flexibility through variable-period poling of a compact cylindrical optical fiber assembly

Номер: US20220173565A1
Автор: Barrett David M, Courtney Trevor, Keyser Christian, Timler John
Принадлежит:

A cylindrical electrode module of a fiber optic laser system includes an inner cylinder having an inner repeating pattern of longitudinally-aligned positive and negative electrodes on an outer surface of the inner cylinder. The cylindrical electrode mode includes an outer cylinder that encloses the inner cylinder. The outer cylinder that has an outer repeating pattern of longitudinally-aligned negative and positive electrodes on an inner surface of the inner cylinder that are in corresponding and complementary, parallel alignment with the positive and negative electrodes of the inner repeating pattern on the outer surface of the inner cylinder. The cylindrical electrode module includes an optical fiber having an input end configured to align with and be optically coupled to a pump laser. The optical fiber is wrapped around the inner cylinder within the outer cylinder to form a cylindrical fiber assembly. The electrodes are activated to achieve quasi-phase matching. 1. A cylindrical electrode module for a fiber optic laser system , the cylindrical electrode module comprising:an inner cylinder comprising an inner additively printed substrate having an inner repeating pattern of longitudinally-aligned positive and negative electrodes on an outer surface of the inner cylinder;an outer cylinder that encloses the inner cylinder and comprises an outer additively printed substrate having an outer repeating pattern of longitudinally-aligned negative and positive electrodes on an inner surface of the inner cylinder that are in corresponding and complementary, parallel alignment with the positive and negative electrodes of the inner repeating pattern on the outer surface of the inner cylinder;an optical fiber having: (i) an output end; and (ii) an input end configured to align with and be optically coupled to a high power pump laser, the optical fiber wrapped around the inner cylinder within the outer cylinder to form a cylindrical fiber assembly, the output end extending out ...

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Номер записи: 59
02-04-2020 дата публикации

SELF-LEARNING FIBER PROCESSING SYSTEM AND METHOD

Номер: US20200102242A1
Автор: Clark Brett, Lower John, Wiley Robert G.
Принадлежит:

Provided is a system for and a method of processing an optical fiber, such as tapering an optical fiber. The method includes receiving fiber parameters defining characteristics of an optical fiber, modeling an idealized fiber based on the fiber parameters to establish modeled data, and establishing processing parameters. A processing operation is performed on the optical fiber according to the processing parameters to produce a resultant fiber. Aspects of the resultant fiber are measured to establish measured data. The measured data and the modeled data are normalized to a common axis and a difference between the two is determined. The processing parameters are adjusted based on the differences. 1. A method of tapering an optical fiber by a fiber tapering machine having at least one processor , memory , a heat source , at least one fiber holder , and or more sensors , comprising:receiving fiber parameters defining taper characteristics of an optical fiber to be tapered;modeling an idealized fiber taper based on the fiber parameters to establish modeled data by the processor;establishing processing parameters from the fiber parameters for controlling aspects of the fiber tapering machine, by the processor;performing a tapering operation on the optical fiber according to the processing parameters to produce a resultant fiber taper, the tapering operation performed by applying heat from the heat source to a portion of the fiber while translating a fiber holder to which the fiber is coupled;measuring aspects of the resultant fiber taper to establish measured data with the one or more sensors;determining differences between the measured data and the modeled data by the processor; andadjusting one or more of the processing parameters to form adjusted processing parameters based on the differences, by the processor.2. The method of claim 1 , further comprising:performing a next tapering operation using the adjusted processing parameters to form a new resultant fiber taper. ...

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Номер записи: 60
29-04-2021 дата публикации

HOLLOW-CORE PHOTONIC CRYSTAL FIBER BASED OPTICAL COMPONENT FOR BROADBAND RADIATION GENERATION

Номер: US20210124112A1
Автор: BALTIS Coen Hubertus Matheus, Bauerschmidt Sebastian Thomas, Götz Peter Maximilian, RAVENSBERGEN Janneke, Uebel Patrick Sebastian
Принадлежит: ASML Netherlands B.V.

Optical components and methods of manufacture thereof. A first optical component has a hollow-core photonic crystal fiber includes internal capillaries for guiding radiation and an outer capillary sheathing the internal capillaries; and at least an output end section having a larger inner cross-sectional dimension over at least a portion of the output end section than an inner cross-sectional dimension of the outer capillary along a central portion of the hollow-core photonic crystal fiber prior to the output end section. A second optical component includes a hollow-core photonic crystal fiber and a sleeve arrangement. 1. An optical component , comprising:a hollow-core photonic crystal fiber comprising internal capillaries for guiding radiation and an outer capillary sheathing the internal capillaries; andat least an output end section having a larger inner cross-sectional dimension over at least a portion of the output end section than an inner cross-sectional dimension of the outer capillary along a central portion of the hollow-core photonic crystal fiber prior to the output end section.2. The optical component according to claim 1 , wherein the output end section is configured such that divergent radiation emitted from the hollow-core photonic crystal fiber is not blocked by the output end section in an axial propagation direction.3. The optical component according to claim 1 , wherein internal capillaries of the hollow-core photonic crystal fiber are collapsed to define a tapered core region at each end of the hollow-core photonic crystal fiber claim 1 , the tapered core region comprising a region where a hollow core of the hollow-core photonic crystal fiber has an increasing cross-sectional dimension towards each end of the hollow-core photonic crystal fiber.4. The optical component according to claim 1 , further comprising:an input end section;first and second transparent end caps sealing respective ends of the hollow-core photonic crystal fiber; anda gas ...

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Номер записи: 61
27-04-2017 дата публикации

CHOPPED-FIBERS WITH AXIAL PROPERTY GRADIENT FOR MOLDED PARTS

Номер: US20170113962A1
Автор: Hamburgen William, Rivera Felix Jose Alvarez
Принадлежит:

A portable computing device includes a processor, a memory, and a portable computing device case that encloses one or more integrated circuits, including at least the processor and the memory. The case includes a molded fiber-reinforced polymer (FRP) material that includes a polymer material and elongated fibers that adhere to the polymer material and that have a property that varies over a length of the fibers along an elongation axis of the fibers, wherein an adhesion strength between the fibers and the polymer is determined at least in part by a property of the fibers that varies over a length of the fibers along the elongation axis. 1. A method of making glass fibers for use in a molded , fiber-reinforced polymer material , the method comprising:drawing a fiber from a glass preform;vibrating the drawn fiber as it is being drawn;varying a frequency and/or amplitude of the vibration, wherein the diameter of the drawn fiber is determined at least in part by the amplitude and/or frequency of the vibration;cutting the drawn fiber into subsections, wherein the subsections have a diameter that varies over a length along an elongation axis of the subsections.2. The method of claim 1 , wherein the subsections have a diameter at the ends of the subsections that is smaller than the diameter at the middle of the subsections.3. The method of claim 1 ,wherein the vibrating the drawn fiber as it is being drawn includes vibrating the fiber at a first frequency and add a second frequency, andwherein varying a frequency of the vibration includes varying the frequency and/or amplitude of the first vibration frequency and varying the frequency and/or amplitude of the second vibration frequency.4. The method of claim 1 , further comprisinglocally pitting a surface of the drawn fiber and varying the amplitude and/or frequency of the pitting along the length of the fiber. This application is a divisional of, and claims priority to, U.S. application Ser. No. 13/841,444, filed Mar. 15, ...

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Номер записи: 62
09-04-2020 дата публикации

CAPILLARY TUBE AND METHOD OF PRODUCING THE SAME

Номер: US20200109078A1
Автор: Schmitt Clemens, Weidlich Stefan, Werner Joerg
Принадлежит: HERAEUS QUARZGLAS GMBH & CO. KG

A method of producing a capillary tube from glass includes zonally softening a tubular preform having an outer diameter D, an inner diameter Dand a diameter ratio D—with D=D/D—in a heating zone heated to a draw temperature Tand drawing off continuously from the softened region a capillary strand having an outer diameter d, an inner diameter dand a diameter ratio d—with d=d/d—at a draw speed vand cutting the capillary to length therefrom. For cost-effective production of a thick-walled capillary by drawing from a preform without strict requirements for the geometry and dimensional accuracy of the preform, the capillary bore is subjected in the heating zone to a shrinkage process based on the action of draw temperature Tand surface tension, such that the diameter ratio dof the capillary strand is adjusted to a value greater than the diameter ratio Dof the preform by at least a factor of 5. 1. A method of producing a capillary tube from glass , comprising:{'sub': OD', 'ID', 'rel', 'rel', 'OD', 'ID', 'draw, 'zonally softening a tubular preform having an outer diameter D, an inner diameter Dand a diameter ratio D—with D=D/D—in a heating zone heated to a draw temperature T;'}{'sub': OD', 'ID', 'rel', 'rel', 'OD', 'ID', 'draw, 'drawning off continuously from the softened region a capillary strand having an outer diameter d, an inner diameter dand a diameter ratio d—with d=d/d—at a draw speed v; and'}cutting the capillary tube to length therefrom;{'sub': draw', 'rel', 'rel, 'characterized in that a capillary bore is subjected in the heating zone to a shrinkage process based on the action of draw temperature Tand surface tension in such a way that the diameter ratio dof the capillary strand is adjusted to a value greater than the diameter ratio Dof the preform by at least a factor of 5, and wherein a multimode optical fiber preform or a single-mode optical fiber preform with a preform core surrounding an inner bore and a preform cladding covering the preform core is employed ...

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Номер записи: 63
25-08-2022 дата публикации

METHODS FOR PRODUCING A HOLLOW-CORE FIBER AND FOR PRODUCING A PREFORM FOR A HOLLOW-CORE FIBER

Номер: US20220267192A1
Автор: Hünermann Michael, Rosenberger Manuel, Schuster Kay, Tansel Yusuf, Trommer Martin, Weimann Steffen
Принадлежит:

Methods are known for producing an anti-resonant hollow-core fiber which has a hollow core extending along a fiber longitudinal axis and an inner jacket region that surrounds the hollow core, said jacket region comprising multiple anti-resonant elements. The known methods have the steps of: providing a cladding tube that has a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall extends that is delimited by an interior and an exterior; providing a number of tubular anti-resonant element preforms; arranging the anti-resonant element preforms at target positions of the interior of the cladding tube wall, thereby forming a primary preform which has a hollow core region and an inner jacket region; and elongating the primary preform in order to form the hollow-core fiber or further processing the primary preform in order to form a secondary preform. The aim of the invention is to achieve a high degree of precision and an exact positioning of the anti-resonant elements in a sufficiently stable and reproducible manner on the basis of the aforementioned methods. This is achieved in that a cladding tube is provided with an outer diameter ranging from 90 to 250 mm and a length of at least 1 m; tubular structural elements are provided, at least some of which have a wall thickness ranging from 0.2 to 2 mm and a length of at least 1 m; and the structural elements are arranged in the cladding tube inner bore while the cladding tube longitudinal axis is vertically oriented, the upper end face of each structural element being positioned at the target position. 1. Method for producing an anti-resonant hollow-core fiber comprising a hollow core extending along a longitudinal axis of the fiber and an inner sheath region surrounding the hollow core , which sheath region comprises several anti-resonance elements , comprising the method steps of:{'b': 1', '6, '(a) providing a cladding tube () comprising an inner bore () of the cladding tube and ...

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Номер записи: 64
25-08-2022 дата публикации

METHODS FOR PRODUCING A HOLLOW-CORE FIBER AND FOR PRODUCING A PREFORM FOR A HOLLOW-CORE FIBER

Номер: US20220267193A1
Автор: Hünermann Michael, Rosenberger Manuel, Schuster Kay, Trommer Martin, Weimann Steffen
Принадлежит:

Methods are known for producing an anti-resonant hollow-core fiber which has a hollow core extending along a fiber longitudinal axis and an inner jacket region that surrounds the hollow core, said jacket region comprising multiple anti-resonant elements. The known methods have the steps of: providing a cladding tube that has a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall extends that is delimited by an interior and an exterior; providing a number of tubular anti-resonant element preforms; arranging the anti-resonant element preforms at target positions of the interior of the cladding tube wall, thereby forming a primary preform which has a hollow core region and an inner jacket region; and elongating the primary preform in order to form the hollow-core fiber or further processing the primary preform in order to form a secondary preform. The aim of the invention is to achieve a high degree of precision and an exact positioning of the anti-resonant elements in a sufficiently stable and reproducible manner on the basis of the aforementioned methods. This is achieved in that while carrying out a process according to step (c), components of the primary preform made of quartz glass and/or parts surrounding the primary preform made of quartz glass are heated and softened together, wherein the quartz glass of at least one of the preform components and/or the quartz glass of at least one of the parts surrounding the preform contains at least one dopant which decreases or increases the viscosity of quartz glass. 1. Method for producing an anti-resonant hollow-core fiber comprising a hollow core extending along a longitudinal axis of the fiber and an inner sheath region surrounding the hollow core , which sheath region comprises several anti-resonance elements , comprising the method steps of:{'b': 1', '3, '(a) providing a primary preform () for the hollow-core fiber which comprises at least one cladding tube () having an ...

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Номер записи: 65
16-04-2020 дата публикации

FIBER PREFORM, OPTICAL FIBER AND METHODS FOR FORMING THE SAME

Номер: US20200115270A1
Автор: Huang Xiaosheng, Yoo Seongwoo
Принадлежит:

According to embodiments of the present invention, a fiber preform or an optical fiber is provided. The fiber preform or the optical fiber includes a core region, and a cladding arrangement comprising a first cladding region comprising a plurality of rods entirely surrounding the core region, and a second cladding region in between the core region and the first cladding region, the second cladding region comprising a plurality of tubes, wherein a plurality of splits are defined in the second cladding region. According to further embodiments of the present invention, a method for forming a fiber preform and a method for forming an optical fiber are also provided. 1. A fiber preform or an optical fiber comprising:a core region; and a first cladding region comprising a plurality of rods entirely surrounding the core region, and', 'a second cladding region in between the core region and the first cladding region, the second cladding region comprising a plurality of tubes, wherein a plurality of splits are defined in the second cladding region., 'a cladding arrangement comprising2. The fiber preform or the optical fiber as claimed in claim 1 , wherein the plurality of splits extend through the second cladding region entirely in a direction from the core region to the first cladding region.3. The fiber preform or the optical fiber as claimed in claim 2 , wherein the direction is a radial direction extending from the core region.4. The fiber preform or the optical fiber as claimed in claim 1 , wherein a respective split of the plurality of splits is defined between adjacent single tubes of the plurality of tubes.5. The fiber preform or the optical fiber as claimed in claim 1 , wherein a respective split of the plurality of splits is defined between adjacent two or more tubes of the plurality of tubes.6. The fiber preform or the optical fiber as claimed in claim 1 , wherein the plurality of tubes are arranged in a plurality of layers surrounding the core region.7. The fiber ...

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Номер записи: 66
16-04-2020 дата публикации

OPTICAL CONNECTION COMPONENT

Номер: US20200116948A1
Автор: KANEUCHI Yasuomi, Mitose Yuuichi, NAKANISHI Tetsuya
Принадлежит:

The embodiment relates to an optical connection component including a bent optical fiber having a bent portion including a region where a curvature of the bent portion is maintained at 0.4 [l/mm] or more while substantially no bending stress remains. The bent optical fiber comprises a core, a first cladding, a second cladding, and a third cladding. Based on the third cladding, a relative refractive index difference Δ1 of the core, a relative refractive index difference Δ2 of the first cladding, and a relative refractive index difference Δ3 of the second cladding satisfy relationships of Δ1>Δ2>Δ3 and Δ3<−0.5 [%]. The product V3 of the Δ3 and a cross-sectional area S of the second cladding is less than −200 [%·μm]. The curvature in the bent portion is 0.6 [l/mm] or less over an entire length of the bent portion. 1. An optical connection component comprisinga bent optical fiber having:{'sub': '2', 'a glass fiber mainly comprising of SiOglass; and'}a resin coating surrounding the glass fiber while being removed from an end of the glass fiber,whereinthe glass fiber at least includes a core, a first cladding surrounding the core, a second cladding surrounding the first cladding, and a third cladding surrounding the second cladding, {'br': None, 'Δ1>Δ2>Δ3 and Δ3<−0.5[%],'}, 'a relative refractive index difference Δ1 of the core with respect to the third cladding, a relative refractive index difference Δ2 of the first cladding with respect to the third cladding, and a relative refractive index difference Δ3 of the second cladding with respect to the third cladding satisfy relationships of'}{'sup': '2', 'a product V3 of the relative refractive index difference Δ3 and a cross-sectional area S of the second cladding is less than −200 [%·μm], and'} 'a bent portion including a region where a curvature of the bent portion is maintained at 0.4 [l/mm] or more in a state where substantially no bending stress remains, the curvature in the bent portion being 0.6 [l/mm] or less over an ...

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Номер записи: 67
11-05-2017 дата публикации

Method of making optical fibers in a reducing atmosphere

Номер: US20170129800A1
Автор: Amanda Lee Billings, Dana Craig Bookbinder, LI YANG, Liam Ruan dePaor, Pushkar Tandon, Robert Brett Desorcie
Принадлежит: Cornng Inc

A method for forming an optical fiber preform and fibers drawn from the preform. The method includes forming a soot cladding monolith, inserting a consolidated core cane into the internal cavity, and processing the resulting core-cladding assembly to form a preform. Processing may include exposing the core-cladding assembly to a drying agent and/or dopant precursor, and sintering the core-cladding assembly in the presence of a reducing agent to densify the soot cladding monolith onto the core cane to form a preform. The preform features low hydroxyl content and low sensitivity to hydrogen. Fibers drawn from the preform exhibit low attenuation losses from absorption by the broad band centered near 1380 nm.

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Номер записи: 68
03-06-2021 дата публикации

DEVICE AND METHOD FOR CONNECTING A FIBER PREFORM TO A PRESSURE SUPPLY SYSTEM

Номер: US20210163338A1
Автор: Bauerschmidt Sebastian Thomas, Niu Mingli
Принадлежит: ASML Netherlands B.V.

A device for connecting a fiber preform including a plurality of elongate holes extending substantially parallel to a longitudinal axis of the fiber preform to a pressure supply system, the device including a first surface to be connected to an end face of the fiber preform where the plurality of elongate holes end, a second surface including at least two ports configured to be in fluid connection with the pressure supply system, and a channel system within the device connecting the plurality of elongate holes at the first surface to the at least two ports, wherein a density of the at least two ports at the second surface is smaller than a density of the plurality of corresponding elongate holes at the first surface. 1. A device for connecting a fiber preform including a plurality of elongate holes extending substantially parallel to a longitudinal axis of the fiber preform to a pressure supply system , the device comprising:a first surface to be connected to an end face of the fiber preform where the plurality of elongate holes end;a second surface comprising at least two ports configured to be in fluid connection with the pressure supply system; anda channel system within the device comprising the plurality of elongate holes and comprising channels connecting the plurality of elongate holes at the first surface to the at least two ports such that at least one of the plurality of elongate holes is connected to one of the at least two ports and such that at least one other of the plurality of elongate holes is connected to another one of the at least two ports,wherein a density of the at least two ports at the second surface is smaller than a density of the corresponding plurality of elongate holes at the first surface.2. The device according to claim 1 , wherein the second surface includes a first surface portion substantially opposite the first surface and a second surface portion extending substantially non-parallel to the first surface claim 1 , and wherein at ...

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Номер записи: 69
21-05-2015 дата публикации

OPTOGENETIC PROBE

Номер: US20150141844A1
Автор: GRAVEL Jean-François, Ledemi Yannick, MESSADDEQ Younès, Rioux Maxime, VIENS Jean-François
Принадлежит:

An optogenetic probe, an optogenetic system, and a method for fabricating an optogenetic probe are provided. The optogenetic probe has a proximal and a distal end, and includes an elongated body made of a body glass material and extending longitudinally between the proximal and distal ends. The optogenetic probe also includes at least one optical channel, each including an optical channel glass material having a refractive index larger than a refractive index of the body glass material, so as to guide light therealong. The optogenetic probes also includes at least one electrical channel, each including an electrical channel structure having an electrical conductivity larger than the electrical conductivity of the body glass material, so as to conduct electricity therealong. The optogenetic probe further includes at least one fluidic channel, each adapted for transporting fluid therealong. Each optical, electrical and fluidic channel extends longitudinally within the elongated body. 1. An optogenetic probe having a proximal and a distal end , the optogenetic probe comprising:an elongated body made of a body glass material having a refractive index and an electrical conductivity, the elongated body extending longitudinally between the proximal and distal ends of the optogenetic probe;at least one optical channel extending longitudinally within the elongated body and comprising an optical channel glass material having a refractive index larger than the refractive index of the body glass material, so as to guide light therealong;at least one electrical channel extending longitudinally within the elongated body and comprising an electrical channel structure having an electrical conductivity larger than the electrical conductivity of the body glass material, so as to conduct electricity therealong; andat least one fluidic channel extending longitudinally within the elongated body and adapted for transporting fluid therealong.2. The optogenetic probe according to claim 1 , ...

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Номер записи: 70
18-05-2017 дата публикации

Method and device for forming microstructured fibre

Номер: US20170136657A1
Автор: Heike Ebendorff-Heidepriem, Philip Davies, Tanya Monro
Принадлежит: ADELAIDE RESEARCH AND INNOVATION PTY LTD

A die and method for extruding an extrudable material to form an extruded member is described. In one embodiment, the die comprises a barrier member comprising a plurality of feed channels that extend through the barrier member. Furthermore, the die incorporates a passage forming member extending from the barrier member substantially in the direction of extrusion. The feed channels are arranged with respect to the passage forming member to allow the extrudable material to substantially flow about the passage forming member to form a corresponding passage in the extruded member.

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Номер записи: 71
09-05-2019 дата публикации

A METHOD OF FIBER PRODUCTION

Номер: US20190135679A1
Автор: JAKOBSEN Christian, LYNGSØE Jens Kristian, MICHIELETTO Mattia, SIMONSEN Harald Roager
Принадлежит: NKT Photonics A/S

A method of producing a microstructured optical fiber is disclosed. The method includes providing a preform and drawing the preform. The preform has a center axis, a length and a first end and a second end and has at least one longitudinal hole extending lengthwise. The method includes inserting a first end of a pressure tube into the hole of the preform at the first end of the preform and subjecting the hole of the preform to a controlled pressure via the pressure tube during the drawing. 1. A method of producing a microstructured optical fiber , the method comprisingproviding a preform and drawing the preform, wherein the preform having a center axis, a length and a first end and a second end and comprises at least one longitudinal hole extending lengthwise, and wherein the method comprises inserting a first end of a pressure tube into said hole of said preform at the first end of the preform and subjecting said hole of said preform to a controlled pressure via said pressure tube during the drawing.2. The method of claim 1 , wherein the method comprises drawing the preform to the microstructured optical fiber in one or more drawing steps claim 1 , wherein at least one of the drawing steps comprises subjecting said hole of said preform to a controlled pressure via said pressure tube during the drawing.3. The method of claim 2 , wherein the drawing steps comprise a pre-drawing step claim 2 , preferably the pre-drawing step comprises subjecting said hole of said element to a controlled pressure via said pressure tube during the drawing.4. The method of or claim 2 , wherein the drawing steps comprise a final-drawing step claim 2 , preferably the final-drawing step comprises subjecting said hole of said element to a controlled pressure via said pressure tube during the drawing.5. The method of any one of the preceding claims claim 2 , wherein the at least one longitudinal hole is open at the first end of the preform for facilitating insertion of the first end of the ...

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Номер записи: 72
08-09-2022 дата публикации

Optical fiber with reduced attenuation due to reduced absorption contribution

Номер: US20220283363A1
Автор: Pushkar Tandon, Stephan Lvovich Logunov
Принадлежит: Corning Inc

A single mode optical fiber including a core region doped with an alkali metal. The optical fiber has a total attenuation at 1550 nm of about 0.155 dB/km or less such that extrinsic absorption in the optical fiber contributes to 0.004 dB/km or less of the total attenuation

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Номер записи: 73
30-04-2020 дата публикации

Methods of forming optical fibers having an expanded core for evanescent optical coupling

Номер: US20200132936A1
Автор: Alan Frank Evans, Aramais Robert Zakharian, Davide Domenico Fortusini, Ming-Jun Li
Принадлежит: Corning Research and Development Corp

The methods disclosed herein include forming an expanded core in an optical fiber with a glass core having a core dopant and a core outer surface, and a glass cladding immediately surrounding the core and having a flat glass-portion surface closest to the core outer surface at a first core spacing S 1 . The methods include applying heat to a section of the optical fiber to cause the glass core to expand toward the flat glass-portion surface due to thermal diffusion of the core dopant. The methods also include terminating the application of heat to define the expanded core in the heated section of the optical fiber. The expanded core defines an evanescent coupling region having a second core spacing 0≤S 2 <S 1 and an adiabatic transition region between the core and the evanescent coupling region of the expanded core.

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Номер записи: 74
14-08-2014 дата публикации

FOAMABLE COMPOSITION, FOAM COMPOSITE, METHOD OF MAKING FOAM COMPOSITE AND USE OF FOAM COMPOSITE

Номер: US20140228461A1
Автор: Johansson Dorte Bartnik, Nielsen Dag
Принадлежит: ROCKWOOL INTERNATIONAL A/S

The invention provides a foamable composition comprising a foam pre-cursor and man-made vitreous fibres produced with a cascade spinner or a spinning cup, wherein at least 50% by weight of the man-made vitreous fibres have a length of less than 100 micrometres. 1. A foamable composition comprising a foam pre-cursor and man-made vitreous fibres produced with a cascade spinner or a spinning cup , wherein at least 50% by weight of the man-made vitreous fibres have a length of less than 100 micrometres.2. A foamable composition according to claim 1 , wherein at least 60% of the man-made vitreous fibres by weight have a length less than 65 micrometres.3. A foamable composition according to claim 1 , wherein at least 80% of the man-made vitreous fibres by weight have a length less than 125 micrometres.4. A foamable composition according to claim 1 , wherein at least 95% of the man-made vitreous fibres by weight have a length less than 250 micrometres.5. A foamable composition according to wherein at least 75% of the man-made vitreous fibres by weight have a length less than 65 micrometres and at least 95% of the man-made vitreous fibres by weight have a length less than 100 micrometers.6. A foamable composition according to claim 1 , wherein at least 0.5% claim 1 , preferably at least 1% by weight of the man-made vitreous fibres claim 1 , have a length less than 10 micrometers.7. A foamable composition according to preceding claim 1 , wherein the fibres have an average diameter of from 2 to 6 claim 1 , preferably from 3 to 6 micrometers.8. A foamable composition according to claim 1 , wherein the man-made vitreous fibres have a content of oxides as follows:{'sub': '2', 'SiO25 to 50 wt %, preferably 38 to 48 wt %'}{'sub': 2', '3, 'AlO12 to 30 wt %, preferably 15 to 28 wt %, more preferably 17 to 23 wt %'}{'sub': '2', 'TiOup to 2 wt %'}{'sub': 2', '3, 'FeO2 to 12 wt %'}CaO 5 to 30 wt %, preferably 5 to 18 wt %MgO up to 15 wt %, preferably 4 to 10 wt %{'sub': '2', 'NaO up to ...

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Номер записи: 75
21-08-2014 дата публикации

METHOD FOR MANUFACTURING A PRIMARY PREFORM FOR OPTICAL FIBRES

Номер: US20140230495A1
Автор: Hartsuiker Johannes Antoon, Kuijpers Eric Aloysius, Milicevic Igor, Van Stralen Mattheus Jacobus Nicolaas
Принадлежит: DRAKA COMTEQ B.V.

A method for manufacturing a primary preform for optical fibres including surrounding at least part of a hollow substrate tube with a furnace set at a temperature T0, supplying doped or undoped gases to the inside of the tube, creating a reaction zone to promote deposition, and moving the zone back and forth along the length of the tube between to form at least one preform layer, wherein the temperature of the furnace is varied linearly as a function of the thickness of the at least one preform layer to compensate for temperature increases of the tube during deposition. 1. A method for manufacturing a primary preform for optical fibres using an internal vapour deposition process , comprising the steps of:i) providing a hollow glass substrate tube having a supply side and a discharge side;ii) surrounding at least part of the hollow substrate tube with a furnace set at a temperature T0,iii) supplying doped or undoped glass-forming gases to the interior of the hollow glass substrate tube via the supply side;iv) creating a reaction zone with conditions such that deposition of glass on the inner surface of the hollow glass substrate tube takes place; andv) moving the reaction zone back and forth along the length of the hollow glass substrate tube between a reversal point located near the supply side and a reversal point located near the discharge side to form at least one preform layer on the inner surface of the hollow glass substrate tube, the at least one preform layer comprising several glass layers;wherein the temperature of the furnace surrounding the hollow glass substrate tube is varied linearly as a function of the thickness of the at least one preform layer in the radial direction during at least part of step v) to compensate for the temperature increase of the hollow glass substrate tube during the deposition process.2. The method according to claim 1 , wherein an average temperature variation dT/dt in a first preform layer is different from an average ...

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Номер записи: 76
02-06-2016 дата публикации

METHOD OF MAKING UPDOPED CLADDING BY USING SILICON TERTRACHLORIDE AS THE DOPANT

Номер: US20160152510A1
Автор: Harper Brian Lee, Khrapko Rostislav Radiyevich, Mishra Snigdharaj Kumar, Raney Sonya Marie, Tandon Pushkar
Принадлежит:

One embodiment of the disclosure relates to a method of making an optical fiber comprising the steps of: (i) exposing a silica based preform with at least one porous glass region having soot density of ρ to a gas mixture comprising SiClhaving SiClmole fraction yat a doping temperature Tsuch that parameter X is larger than 0.03 to form the chlorine treated preform, wherein 1. (canceled)2. (canceled)3. (canceled)4. (canceled)5. (canceled)6. (canceled)7. (canceled)8. (canceled)9. (canceled)10. (canceled)11. (canceled)12. (canceled)13. (canceled)14. (canceled)15. (canceled)16. (canceled)17. (canceled)18. (canceled)19. (canceled)20. (canceled)22. The method of making an optical fiber preform according to claim 21 , wherein said step of exposing the chlorine treated preform to temperatures above 1400° C. to completely sinter the chlorine treated preform is performed in essentially SiClfree environment.23. The method of making an optical fiber preform according to claim 21 , wherein the parameter X is larger than 0.75.24. The method of making an optical fiber preform according to claim 21 , wherein chlorine doping profile of the Cl doped region is such that the ratio of the concentration of doped chlorine in an inner portion of the Cl doped region to maximum concentration of doped chlorine in the Cl doped region is ≧0.4.25. The method of making an optical fiber preform according to claim 21 , wherein chlorine doping profile is such that the ratio of the concentration of doped chlorine in the inner portion of the Cl doped region to concentration of doped chlorine in the outer portion of the Cl doped region is ≧0.75.26. The method of making an optical fiber preform according to claim 21 , wherein Tis less than 1225° C.27. The method of making an optical fiber preform according to claim 21 , wherein Tis less than 1200° C.28. The method of making an optical fiber preform according to claim 21 , wherein the mole fraction of SiClin the gas mixture yis larger than 0.005.29. The ...

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Номер записи: 77
15-09-2022 дата публикации

METHODS FOR PRODUCING A HOLLOW-CORE FIBER AND FOR PRODUCING A PREFORM FOR A HOLLOW-CORE FIBER

Номер: US20220291443A1
Автор: Hünermann Michael, Rosenberger Manuel, Schuster Kay, Trommer Martin, Weimann Steffen
Принадлежит:

Methods are known for producing an anti-resonant hollow-core fiber which has a hollow core extending along a fiber longitudinal axis and an inner jacket region that surrounds the hollow core, said jacket region comprising multiple anti-resonant elements. The known methods have the steps of: providing a cladding tube that has a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall extends that is delimited by an interior and an exterior; providing a number of tubular anti-resonant element preforms; arranging the anti-resonant element preforms at target positions of the interior of the cladding tube wall, thereby forming a primary preform which has a hollow core region and an inner jacket region; and elongating the primary preform in order to form the hollow-core fiber or further processing the primary preform in order to form a secondary preform. The aim of the invention is to achieve a high degree of precision and an exact positioning of the anti-resonant elements in a sufficiently stable and reproducible manner on the basis of the aforementioned methods. This is achieved in that while further processing the primary preform according to step (c), an external layer cylinder is used which has a radial viscosity profile such that the viscosity increases towards the interior of the external layer cylinder. 1. Method for producing an anti-resonant hollow-core fiber comprising a hollow core extending along a longitudinal axis of the fiber and an inner sheath region surrounding the hollow core , which sheath region comprises a plurality of anti-resonance elements , comprising the method steps of:{'b': 1', '3, '(a) providing a primary preform () for a hollow-core fiber which comprises at least one cladding tube () having a cladding tube inner bore and a cladding tube longitudinal axis along which a cladding tube wall delimited by an inner side and an outer side extends,'}{'b': '4', '(b) forming a number of precursors or preforms () ...

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Номер записи: 78
28-08-2014 дата публикации

Systems and Techniques For Fabricating Optical Fiber Gratings

Номер: US20140238080A1
Автор: Gruner-Nielsen Lars, Olsen Jorgen Ostgaard
Принадлежит:

A resistive heating element is used to fabricate a long-period grating mode converter. The resistive heating element creates a localized heating zone for creating an asymmetric perturbation at a periodic series of axial locations along the length of a segment of optical fiber that supports the propagation of both a symmetric mode and an asymmetric mode. In a further technique, a grating is written with an index contrast value that is higher than a selected optimum value. The heating element is then used to anneal the fiber segment so as to reduce the contrast value of the grating to the selected optimum value. 1. A method for writing an optical device into an optical fiber , the method comprising:(a) providing a segment of optical fiber;(b) providing a resistive heating element having a thickness less than a selected device period, wherein the resistive heating element will be used to create a localized heating zone having an axial length that is shorter than a selected device period;(c) positioning the fiber segment so that a side surface of the fiber segment is proximate to a side surface of the resistive heating element;(d) positioning the fiber segment with respect to the resistive heating element such that a selected portion of the fiber segment is located in the localized heating zone of the resistive heating element; and(e) raising the temperature of the resistive heating element to cause a rotationally asymmetric perturbation in the selected portion of the fiber segment.2. The method of claim 1 , further comprising:repeating the positioning and the raising of the temperature of the resistive heating element for successive selected portions of the optical fiber segment, so as to write a grating into the optical fiber segment.3. The method of claim 1 , wherein the fiber segment is translated across a surface of the resistive heating element.4. The method of claim 1 , wherein the resistive heating element is translated across a surface of the fiber segment.5. ...

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Номер записи: 79
23-05-2019 дата публикации

Preparation of quartz glass bodies from silicon dioxide powder

Номер: US20190152827A1
Автор: Martin Trommer, Matthias OTTER, Michael Hünermann, Nils Christian NIELSEN, Walter Lehmann
Принадлежит: Heraeus Quarzglas GmbH and Co KG

One aspect relates to a process for the preparation of a quartz glass body, including providing a silicon dioxide granulate, making a glass melt out of silicon dioxide granulate and making a quartz glass body out of at least part of the glass melt. The silicon dioxide granulate is obtained by providing and processing a silicon dioxide powder. One aspect also relates to silicon dioxide granulate, which is obtained by providing a silicon dioxide powder and processing it. One aspect further relates to a quartz glass body which is obtainable by this process. One aspect further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body.

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Номер записи: 80
07-06-2018 дата публикации

OPTICAL CONNECTION COMPONENT

Номер: US20180156987A1
Автор: KANEUCHI Yasuomi, Mitose Yuuichi, NAKANISHI Tetsuya
Принадлежит:

The embodiment relates to an optical connection component including a bent optical fiber having a bent portion including a region where a curvature of the bent portion is maintained at 0.4 [l/mm] or more while substantially no bending stress remains. The bent optical fiber comprises a core, a first cladding, a second cladding, and a third cladding. Based on the third cladding, a relative refractive index difference Δ1 of the core, a relative refractive index difference Δ2 of the first cladding, and a relative refractive index difference Δ3 of the second cladding satisfy relationships of Δ1>Δ2>Δ3 and Δ3<−0.5[%]. The product V3 of the Δ3 and a cross-sectional area S of the second cladding is less than −200[%·μm]. The curvature in the bent portion is 0.6 [l/mm] or less over an entire length of the bent portion. 1. An optical connection component mainly comprised of SiOglass , the optical connection component comprising a bent optical fiber having a bent portion , the bent portion including a region where a curvature of the bent portion is maintained at 0.4 [l/mm] or more in a state where substantially no bending stress remains , whereinthe bent optical fiber at least includes a core, a first cladding surrounding the core, a second cladding surrounding the first cladding, and a third cladding surrounding the second cladding, {'br': None, 'Δ1>Δ2>Δ3 and Δ3<−0.5[%],'}, 'a relative refractive index difference Δ1 of the core with respect to the third cladding, a relative refractive index difference Δ2 of the first cladding with respect to the third cladding, and a relative refractive index difference Δ3 of the second cladding with respect to the third cladding satisfy relationships of'}{'sup': '2', 'a product V3 of the relative refractive index difference Δ3 and a cross-sectional area S of the second cladding is less than −200[%·μm], and'}the curvature in the bent portion is 0.6 [l/mm] or less over an entire length of the bent portion in the bent optical fiber.2. The optical ...

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Номер записи: 81
08-06-2017 дата публикации

OPTICAL FIBER WITH LARGE EFFECTIVE AREA AND LOW BENDING LOSS

Номер: US20170160465A1
Автор: Bookbinder Dana Craig, III Hazel Benton, Li Ming-Jun, Matthews, Mishra Snigdharaj Kumar, Tandon Pushkar
Принадлежит:

An optical fiber with large effective area, low bending loss and low attenuation. The optical fiber includes a core, an inner cladding region, and an outer cladding region. The core region includes a spatially uniform updopant to minimize low Rayleigh scattering and a relative refractive index and radius configured to provide large effective area. The inner cladding region features a large trench volume to minimize bending loss. The core may be doped with Cl and the inner cladding region may be doped with F. 1. An optical fiber comprising:{'sub': 1', '1, 'a core region comprising Cl-doped silica glass having a chlorine concentration greater than 1.5 wt %, said core region having an outer radius rin the range from 6.0 microns to 10.0 microns and a relative refractive index Δ;'}{'sub': 2', '2', 'Trench, 'sup': '2', 'an inner cladding region surrounding said core region, said inner cladding region having an outer radius rin the range from 15 microns to 40 microns, a relative refractive index Δ, and a trench volume Vgreater than 30%Δ-micron; and'}{'sub': 3', '1', '3', '2, 'an outer cladding region surrounding said inner cladding region, said outer cladding region having a relative refractive index Δsuch that Δ>Δ>Δ;'}{'sup': '2', 'wherein said optical fiber has a cable cutoff of less than 1550 nm and an effective area at 1550 nm of at least 100 micron.'}2. The optical fiber of claim 1 , wherein the cable cutoff is less than 1500 nm.3. The optical fiber of claim 1 , wherein the cable cutoff is less than 1450 nm4. The optical fiber of claim 1 , wherein said core is free of Ge.5. The optical fiber of claim 1 , wherein said outer radius ris in the range from 7.0 μm to 10.0 μm.6. The optical fiber of claim 1 , wherein said relative refractive index Δis in the range from 0.08% to 0.30%.7. The optical fiber of claim 1 , wherein said relative refractive index Δexceeds said relative refractive index Δby at least 0.20%.8. The optical fiber of claim 1 , wherein said outer radius ...

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Номер записи: 82
08-06-2017 дата публикации

MULTICORE FIBER AND MANUFACTURING METHOD OF MULTICORE FIBER

Номер: US20170160466A1
Автор: Gonda Tomohiro, IMAMURA Katsunori, MORI Takayoshi, SAKAMOTO Taiji, Sugizaki Ryuichi, WADA Masaki, YAMAMOTO Fumihiko, Yamamoto Takashi
Принадлежит:

A multicore fiber includes a plurality of unit multicore fibers each including: a plurality of core portions; and a clad portion which is formed in an outer circumference of the core portions and has a refractive index lower than a maximum refractive index of the core portions. The plurality of the core portions have substantially same refractive index profile and different group delays at same wavelength in same propagation mode. The core portions of the multicore fiber are configured so that the core portions of the plurality of the unit multicore fibers are connected in cascade, a maximum value of differential group delays between the core portions of the multicore fiber is smaller than a reduced value of a maximum value of differential group delays between the core portions of each unit multicore fiber as a value in terms of a length of the multicore fiber. 1. A multicore fiber comprising a plurality of core portions; and', 'a clad portion which is formed in an outer circumference of the core portions and has a refractive index lower than a maximum refractive index of the core portions, wherein', 'the plurality of the core portions have substantially same refractive index profile and different group delays at same wavelength in same propagation mode,, 'a plurality of unit multicore fibers each includingwherein the core portions of the multicore fiber are configured so that the core portions of the plurality of the unit multicore fibers are connected in cascade, a maximum value of differential group delays between the core portions of the multicore fiber is smaller than a reduced value of a maximum value of differential group delays between the core portions of each unit multicore fiber as a value in terms of a length of the multicore fiber.2. The multicore fiber according to claim 1 , wherein the maximum value of the differential group delays between the core portions of the multicore fiber is smaller than 5 ns over the entire length.3. The multicore fiber ...

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Номер записи: 83
21-05-2020 дата публикации

METHOD FOR FABRICATING AN OPTICAL FIBRE PREFORM

Номер: US20200156987A1
Автор: Poletti Francesco, SHARDLOW Peter, WHEELER Natalie
Принадлежит:

A method of making an optical fibre preform comprising providing a hollow outer tube of glass, providing a hollow primary capillary tube of glass with an outer diameter smaller than an inner diameter of the outer tube, positioning the primary capillary tube inside the outer tube such that an outer surface of the primary capillary tube lies against an inner surface of the outer tube along a contact line parallel to the longitudinal axes of the primary capillary tube and the outer tube, and bonding the primary capillary tube into its position inside the outer tube by directing a laser beam onto a surface of the outer tube or the primary capillary at one or more locations aligned with the contact line. 1. A method of making an optical fibre preform comprising:providing a hollow outer tube of glass;providing a hollow primary capillary tube of glass with an outer diameter smaller than an inner diameter of the outer tube;positioning the primary capillary tube inside the outer tube such that an outer surface of the primary capillary tube lies against an inner surface of the outer tube along a contact line parallel to the longitudinal axes of the primary capillary tube and the outer tube; andbonding the primary capillary tube into its position inside the outer tube by directing a laser beam onto a surface of the outer tube or the primary capillary tube at one or more locations aligned with the contact line.2. A method according to claim 1 , in which the laser beam deposits heat energy to cause softening of the glass of at least the outer tube or the primary capillary tube to enable the bonding.3. A method according to claim 2 , in which the laser beam undergoes linear optical absorption in the glass.4. A method according to claim 2 , in which the laser beam undergoes nonlinear optical absorption in the glass.5. A method according to claim 1 , in which the laser beam undergoes nonlinear optical absorption in the glass to generate photo-ionisation to enable the bonding.6. A ...

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Номер записи: 84
15-06-2017 дата публикации

High chlorine content low attenuation optical fiber

Номер: US20170168231A1
Автор: Dana Craig Bookbinder, George Edward Berkey, Ming-Jun Li, Pushkar Tandon
Принадлежит: Corning Inc

An optical fiber having a core comprising silica and greater than 1.5 wt % chlorine and less than 0.5 wt % F, said core having a refractive index Δ 1MAX , and a inner cladding region having refractive index Δ 2MIN surrounding the core, where Δ 1MAX >Δ 2MIN .

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Номер записи: 85
01-07-2021 дата публикации

METHOD FOR PRODUCING A PREFORM FOR PRODUCING A MULTICORE FIBRE AND ALSO A PREFORM AND A MULTICORE FIBRE

Номер: US20210198139A1
Автор: Haemmerle Wolfgang, Schulze Christian
Принадлежит: LEONI Kabel GmbH

A method for producing a preform for producing a multi-core fiber. The method includes removing a first part-tube segment having a first part-tube segment cross-sectional area from a center of a receiving tube having a receiving tube internal diameter so that the receiving tube has a first core rod receiving cut-out, axially introducing a central filling rod having a filling rod external diameter into the receiving tube so that the receiving tube contains the central filling rod, inserting a first core rod having a first core rod cross-sectional area into the core rod receiving cut-out so that the receiving tube contains the core rod, axially introducing the receiving tube containing the first core rod and the central filling rod into a jacketing tube so as to obtain a jacketing tube containing the receiving tube, and fusing the jacketing tube containing the receiving tube to form the preform. 113-. (canceled)14. A method for producing a preform for producing a multi-core fiber , the method comprising:removing a first part-tube segment comprising a first part-tube segment cross-sectional area from a center of a receiving tube comprising a receiving tube internal diameter so that the receiving tube comprises a first core rod receiving cut-out;axially introducing a central filling rod comprising a filling rod external diameter into the receiving tube, the filling rod external diameter being less than the receiving tube internal diameter so that the receiving tube contains the central filling rod;inserting a first core rod comprising a first core rod cross-sectional area into the core rod receiving cut-out so that the receiving tube contains the core rod;axially introducing the receiving tube containing the first core rod and the central filling rod into a jacketing tube so as to obtain a jacketing tube containing the receiving tube; andfusing the jacketing tube containing the receiving tube to form the preform.16. The method as recited in claim 15 , wherein claim 15 , ...

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Номер записи: 86
21-06-2018 дата публикации

Process of using a submerged combustion melter to produce hollow glass fiber or solid glass fiber having entrained bubbles, and burners and systems to make such fibers

Номер: US20180170792A1
Автор: Kevin Patrick McHugh, Mark William Charbonneau
Принадлежит: JOHNS MANVILLE

Processes and systems for producing glass fibers having regions devoid of glass using submerged combustion melters, including feeding a vitrifiable feed material into a feed inlet of a melting zone of a melter vessel, and heating the vitrifiable material with at least one burner directing combustion products of an oxidant and a first fuel into the melting zone under a level of the molten material in the zone. One or more of the burners is configured to impart heat and turbulence to the molten material, producing a turbulent molten material comprising a plurality of bubbles suspended in the molten material, the bubbles comprising at least some of the combustion products, and optionally other gas species introduced by the burners. The molten material and bubbles are drawn through a bushing fluidly connected to a forehearth to produce a glass fiber comprising a plurality of interior regions substantially devoid of glass.

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Номер записи: 87
23-06-2016 дата публикации

A High-Efficiency Parallel-Beam Laser Optical Fibre Drawing Method and Optical Fibre

Номер: US20160181758A1
Автор: Chen Wei, DAN Rong, DU Cheng, Du Kun, KE Yili, Li Shiyu, Luo Wenyong, MO QI, Zhang Tao
Принадлежит:

Provided are a high-efficiency parallel-beam laser optical fiber drawing method and optical fiber, the method including the steps of: S: providing base planes on the side surfaces of both a gain optical fiber preform and a pump optical fiber preform, inwardly processing the base plane of the gain optical fiber preform to make a plurality of ribs protrude, and inwardly providing a plurality of grooves on the base plane of the pump optical fiber preform; S: embedding the ribs into the grooves, tapering and fixing one end of the combination of the ribs and the grooves to form a parallel-beam laser optical fiber preform; S: drawing the parallel-beam laser optical fiber preform into parallel-beam laser optical fibers. The process has high repeatability, and the obtained parallel-beam laser achieves peelability of pump optical fibers in a set area, thus facilitating multi-point pump light injection of parallel-beam laser optical fibers. 1. A high-efficiency parallel-beam laser optical fibre drawing method , comprising the steps of:{'b': '1', 'S. respectively arranging a base plane at the side surfaces of both a gain optical fibre perform and a pump optical fibre perform; processing the base plane of the gain optical fibre perform inwards to make multiple ribs protrude, planes at both sides of each rib being machined surfaces; and arranging multiple grooves inwards on the base plane of the pump optical fibre perform, the ribs fitting the grooves;'}{'b': '2', 'S. inserting the ribs of the gain optical fibre perform into the grooves of the pump optical fibre perform; and after the two are combined, tapering and fixing one end of the whole to form a parallel-beam laser optical fibre perform; and'}{'b': '3', 'S. by drawing, making the parallel-beam laser optical fibre perform into a parallel-beam laser optical fibre.'}2. The high-efficiency parallel-beam laser optical fibre drawing method according to claim 1 , wherein the ribs are rectangular prisms; and a centre of a cross ...

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Номер записи: 88
06-06-2019 дата публикации

SYSTEM AND METHOD FOR PRODUCING VORTEX FIBER

Номер: US20190170933A1
Автор: ASHRAFI SOLYMAN
Принадлежит:

The present invention, as disclosed and described herein, in one aspect thereof comprises a preform for making a vortex optical fiber includes a glass cylinder formed substantially of silicone dioxide that defines a core portion along a longitudinal axis of the glass cylinder and a cladding portion surrounding the core portion. The glass cylinder further defines a plurality of holes running parallel to the longitudinal axis from a first end of the glass cylinder to a second end of the glass cylinder. 1. A preform for making a vortex optical fiber , comprising:a glass cylinder formed substantially of silicone dioxide that defines a core portion along a longitudinal axis of the glass cylinder and a cladding portion surrounding the core portion; andwherein the glass cylinder further defines a plurality of holes running parallel to the longitudinal axis from a first end of the glass cylinder to a second end of the glass cylinder.2. The preform of claim 1 , wherein the plurality of holes further includes a first hole along the longitudinal axis of the glass cylinder through the core portion and a plurality of second holes located between the first hole and a circumference of the glass cylinder through the cladding portion.3. The preform of claim 1 , wherein the plurality of holes are drilled in the glass cylinder.4. The preform of claim 1 , wherein the preform defines a refractive index profile that contains a valley along the longitudinal axis of the glass cylinder and a pair of peaks along edges of the core portion within the cladding portion.5. The preform of claim 1 , wherein the vortex optical fiber generated from the preform support propagation of optical signals including orthogonal functions.6. A preform for making a vortex optical fiber claim 1 , comprising:a glass cylinder formed substantially of silicone dioxide that defines a core portion along a longitudinal axis of the glass cylinder and a cladding portion surrounding the core portion;wherein the glass ...

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Номер записи: 89
30-06-2016 дата публикации

Method of forming conical shape on glass rod, and glass rod

Номер: US20160185646A1
Автор: Tetsuya Otosaka
Принадлежит: Shin Etsu Chemical Co Ltd

In a method of forming a conical shape on a glass rod including an effective portion and an ineffective portion adjoining the effective portion to form a conical shape in the effective portion by simultaneously heating a boundary and the vicinity of the boundary between the effective portion and the ineffective portion and pulling an end of the ineffective portion, the temperature of a heater is raised and a heating target on the glass rod is simultaneously moved from the ineffective portion to the boundary.

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Номер записи: 90
30-06-2016 дата публикации

OPTICAL FIBER PREFORM AND METHOD FOR MANUFACTURING SUCH OPTICAL FIBER PREFORM FROM A PRIMARY PREFORM

Номер: US20160185649A1
Автор: Calvo Laurent, Delwal Olivier, Gonnet Cedric, Petitfrere Emmanuel
Принадлежит: Draka Comteq BV

The invention relates to an optical fiber preform () comprising a primary preform () and one or more purified silica-based overclad layers () surrounding said primary preform (), the purified silica-based overclad layers () comprising lithium and aluminium, and having a ratio between lithium concentration [Li] and aluminium concentration [Al] satisfying the following inequality (Formula (I)). 1. An optical fiber preform comprising a primary preform and at least one purified silica-based overclad layer surrounding the primary preform , the at least one purified silica-based overclad layer comprising lithium and aluminium , wherein the at least one purified silica-based overclad layer has a ratio between lithium concentration [Li] and aluminium concentration [Al] satisfying the following inequality:{'br': None, 'sup': −3', '[Li]', '−3, 'sub': '[Al]', '1.10≦/≦20.10'}2. The optical fiber preform according to claim 1 , wherein the ratio between lithium concentration [Li] and aluminium concentration [Al] satisfies the following inequality:{'br': None, 'sup': −3', '[Li]', '−3, 'sub': '[Al]', '4.10≦/≦10.10'}3. The optical fiber preform according to claim 1 , wherein the ratio between lithium concentration [Li] and aluminium concentration [Al] satisfies the following inequality:{'br': None, 'sup': −3', '[Li]', '−3, 'sub': '[Al]', '4.10≦/≦6.10'}4. An optical fiber made from the optical fiber preform according to .5. A method for manufacturing an optical fiber preform from a primary preform claim 1 , comprising the steps of:depositing at least one silica-based overclad layer on the primary preform by injection of a powder of natural silica into a plasma provided by a plasma source,injecting, into the plasma, a purifying gas intended to react with lithium, and {'br': None, 'sup': −3', '[Li]', '−3, 'sub': '[Al]', '1.10≦/≦20.10'}, 'adjusting at least one purifying gas injection parameter such that the at least one silica-based overclad layer deposited on the primary preform has a ...

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Номер записи: 91
15-07-2021 дата публикации

Method of measuring optical fiber preform

Номер: US20210215473A1
Автор: Yuhei Urata
Принадлежит: Shin Etsu Chemical Co Ltd

A method of measuring a diameter of a core portion of an optical fiber preform including the core portion having a relatively high refractive index and a clad portion having a relatively low refractive index. The method includes applying parallel light to the optical fiber preform, and measuring the diameter of the core portion from an image captured by receiving the light having transmitted through the optical fiber preform.

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Номер записи: 92
16-07-2015 дата публикации

HIGH-BIREFRINGENCE HOLLOW-CORE FIBERS AND TECHNIQUES FOR MAKING SAME

Номер: US20150198764A1
Автор: DiGiovanni David J., Fini John M., Windeler Robert S.
Принадлежит:

A hollow core fiber has a cladding comprising a matrix of cells, wherein each cell comprises a hole and a wall surrounding the hole. The fiber further has a hollow core region comprising a core gap in the matrix of cells, wherein the core gap spans a plurality of cells and has a boundary defined by the interface of the core gap. The matrix of cells comprises 8 plurality of lattice cells, and a plurality of defect cells characterised by at least one difference in at least one property from that of the lattice cells. The cells at the core region boundary include lattice cells and defect cells that are arranged in a pattern that define two orthogonal axes of reflection symmetry, so as to produce birefringence in a light propagating through the hollow core fiber. 1. A hollow core fiber comprising:a cladding comprising a matrix of cells, each cell comprising a hole and a wall surrounding the hole, anda hollow core region comprising a core gap in the matrix of cells, wherein the core gap spans a plurality of cells and has a boundary defined by the interface between the cells of the core gap and the cells of the cladding, a plurality of lattice cells, and', 'a plurality of defect cells characterized by at least one difference in at least one property from that of the lattice cells, and, 'wherein the matrix of cells comprises'}wherein the cells at the core region boundary include lattice cells and defect cells arranged in a pattern that define two orthogonal axes of reflection symmetry, so as to produce birefringence in a light propagating through the hollow core fiber.2. The fiber of claim 1 , wherein the defect cells are characterized by having a difference in cross sectional solid area compared with that of the lattice cells.3. The fiber of claim 2 , wherein the defect cells are characterized claim 2 , by having a cross sectional solid area that is in the range of 1.1 to 2.0 times the cross sectional area of the lattice cells.5. The fiber of claim 1 , wherein the defect ...

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Номер записи: 93
11-06-2020 дата публикации

METHOD FOR PRODUCING A GLASS-FIBRE PREFORM WITH A CORE OF A POLYGONAL CORE CROSS SECTION

Номер: US20200180995A1
Автор: Hämmerle Wolfgang, Kotzing Jörg
Принадлежит:

The invention relates to a method for producing a glass-fibre preform with a core of a polygonal cross section by using a rod-in-tube method and comprising the method steps of: providing a core rod () of a polygonal core rod cross section (), producing a sectored sandwich tube () from a starting tube (), wherein the lateral surface of the starting tube () is slit in the longitudinal direction into a series of outer segments (), and so the tube cross section of the starting tube () is subdivided into a series of sectors of a circle (), inserting the core rod () into the sectored sandwich tube () and aligning it and, in the case of one embodiment, inserting the core rod () and the sectored sandwich tube () into an outer casing tube () with a complete annular cross section and melting the sectored sandwich tube () and possibly the outer casing tube () onto the sectored sandwich tube (), wherein the outer segments () of the sectored sandwich tube () are fused to the respective side surfaces () of the core rod (). 1. Method for producing a glass fibre preform having a core with a polygonal core cross-section by using a rod-in-tube method and comprising the following method steps:providing a core rod with a polygonal core rod cross-section,producing a sectored sandwich tube from a starting tube, wherein the lateral surface of the starting tube is slit in the longitudinal direction into a series of outer segments, so that the tube cross-section of the starting tube is subdivided into a series of circular sectors,threading and aligning the core rod into the sectored sandwich tube,melting of the outer segments of the sectored sandwich tube onto the respective side faces of the core rod.2. Method according to claim 1 , characterized in that a threading of the sectored sandwich tube and the core rod located therein into an outer casing tube with a complete annular cross-section takes place claim 1 , wherein in the subsequent melting step a melting of the outer casing tube onto ...

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Номер записи: 94
20-06-2019 дата публикации

Optical fiber and method for producing optical fiber

Номер: US20190187366A1
Автор: Kazuyuki Sohma, Tadashi Enomoto, Takashi Fujii, Tomoyuki Hattori
Принадлежит: Sumitomo Electric Industries Ltd

Provided is an optical fiber in which a primary coating layer and a secondary coating layer are formed on an outer circumference of a bare optical fiber including a core and a cladding. A Young's modulus of the primary coating layer is 0.1 to 1.0 MPa, a relationship between lateral rigidity D and flexural rigidity H of the optical fiber as expressed by formulas below satisfies D/H 2 ≤3×10 17 N −1 m −6 , the primary coating layer contains 0.3 to 2.0 wt % of a photoinitiator including phosphorus, and the primary coating layer contains polypropylene glycol having a weight-average molecular weight of 1000 to 5000. The formulas include H = H g + H s = π   r g 4  E g + π  ( r s ι 4 - r p 4 )  E s   and D = 0.897  E p + 2.873  ( E s - E p )  ( E p E s ) 0.8311  ( 2  r s - r p r s - r g ) 1.189 , where r represents a radius (m), E represents a Young's modulus (Pa), a subscript g represents glass (the bare optical fiber), a subscript p represents the primary coating layer, and a subscript s represents the secondary coating layer, respectively.

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Номер записи: 95
29-07-2021 дата публикации

PHOTODARKENING-RESISTANT YTTERBIUM-DOPED QUARTZ OPTICAL FIBER AND PREPARATION METHOD THEREFOR

Номер: US20210230051A1
Автор: Chen Danping, Hu Lili, LOU Fengguang, Wang Meng, XU Xiaoqing, Yu Chunlei, ZHANG LEI
Принадлежит:

A photodarkening-resistant ytterbium-doped quartz optical fiber and a method for preparing such a fiber are provided. Glass of a photodarkening-resistant ytterbium-doped quartz optical fiber core rod includes at least YbO, AlO, PO, SiO. The proportions of YbO, AlO, and POin the entire substance are YbO: 0.05-0.3 mol %, AlO: 1-3 mol %, and PO: 1-5 mol %, respectively. In the preparation method for the photodarkening-resistant ytterbium-doped quartz optical fiber, a sol-gel method and an improved chemical vapor deposition method are combined. By using the molecular-level doping uniformity and the low preparation loss thereof respectively, ytterbium ions, aluminum ions and phosphorus ions are effectively doped in a quartz matrix, thereby effectively solving the problems in the optical fiber of high loss, photodarkening caused by cluster or the like, and a central refractive index dip. 1. A photodarkening-resistant ytterbium-doped silica optical fiber , wherein glass of mandrel of the fiber at least includes YbO , AlO , P , SiO , and wherein , the proportions of YbO , AlO , and Pin the entire substance are respectively: YbO: 0.05˜0.3 mol % , AlO: 1˜3 mol % , PO: 1˜5 mol %.2. A preparation method for the photodarkening-resistant ytterbium-doped silica optical fiber , wherein , the preparation method at least includes: applying a sol-gel method and an immersion method to an improved chemical vapor deposition method to prepare a ytterbium-aluminum-phosphorus-doped silica soot body , and then after dehydration , decarburization , collapse , and drawing , a photodarkening-resistant silica optical fiber is finally prepared.3. The preparation method for the photodarkening-resistant ytterbium-doped silica optical fiber according to claim 2 , wherein claim 2 , the preparation of the ytterbium-aluminum-phosphorus-doped silica soot body needs to use Yb claim 2 , Al claim 2 , and P triple-doped transparent silica transparent sol solution;{'sup': 3+', '3+', '5+', '3+', '3+', '5+, 'b ...

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Номер записи: 96
21-07-2016 дата публикации

OPTICAL FIBER AND MANUFACTURING METHOD THEREOF

Номер: US20160209585A1
Автор: Endo Sho, KISHI Tatsuya, KITAMURA Takayuki
Принадлежит: FUJIKURA LTD.

An optical fiber includes a core, and a clad surrounding an outer circumference of the core, in which a first relative refractive index difference Δ1a is greater than 0, a second relative refractive index difference Δ1b is greater than 0, the first relative refractive index difference Δ1a is greater than the second relative refractive index difference Δ1b, the first relative refractive index difference Δ1a and the second relative refractive index difference Δ1b satisfy a relationship denoted by the following expression: 0.20≦(Δ1a−Δ1b)/Δ1a≦0.88, and a refractive index profile A of the core in an entire region of a section of 0≦r≦r1 as a function Δ(r) of a distance r from a center of the core in the radial direction is denoted by the following expression: Δ(r)=Δ1a−(Δ1a−Δ1b)r/r1. 1. An optical fiber , comprising:a core; anda clad surrounding an outer circumference of the core,wherein when a radius of the core is r1, a relative refractive index difference between a center of the core and the clad is a first relative refractive index difference Δ1a, and a relative refractive index difference between a position in which a distance from the center of the core in a radial direction is r1 and the clad is a second relative refractive index difference Δ1b,the first relative refractive index difference Δ1a is greater than 0,the second relative refractive index difference Δ1b is greater than 0,the first relative refractive index difference Δ1a is greater than the second relative refractive index difference Δ1b, {'br': None, 'i': a−Δ', 'b', 'a<, '0.20<(Δ11)/Δ10.88, and'}, 'the first relative refractive index difference Δ1a and the second relative refractive index difference Δ1b satisfy a relationship denoted by the following expression {'br': None, 'i': r', 'a', 'a−Δ', 'b', 'r/r, 'Δ()=Δ1−(Δ11)1.'}, 'a refractive index profile A of the core in an entire region of a section of 0≦r≦r1 as a function Δ(r) of a distance r from the center of the core in the radial direction is denoted ...

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Номер записи: 97
18-06-2020 дата публикации

High-density optical fiber ribbon with cladding-strengthened glass optical fibers in a common protective coating and fiber ribbon interconnects employing same

Номер: US20200192023A1
Автор: Haitao Zhang, Jeffery Scott Stone, Mandakini Kanungo, Matthew Ryan Drake, Ming-Jun Li, Philip Simon Brown, QI Wu, Richard Michael Fiacco
Принадлежит: Corning Inc

A high-density optical fiber ribbon is formed by two or more cladding-strengthened glass optical fibers each having an outer surface and that do not individually include a protective polymer coating. A common protective coating substantially surrounds the outer surfaces of the two or more cladding-strengthened glass optical fibers so that the common protective coating is common to the two or more cladding-strengthened glass optical fibers. A fiber ribbon cable is formed by adding a cover assembly to the fiber ribbon. A fiber ribbon interconnect is formed adding one or more optical connectors to the fiber ribbon or fiber ribbon cable. Optical data transmission systems that employ the fiber ribbon to optically connect to a photonic device are also disclosed. Methods of forming the cladding-strengthened glass optical fibers and the high-density optical fiber ribbons are also disclosed.

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Номер записи: 98
28-07-2016 дата публикации

METHOD FOR PRODUCING SILICA GLASS PREFORM FOR OPTICAL FIBER

Номер: US20160214884A1
Автор: INOUE Dai, Oyamada Hiroshi
Принадлежит: SHIN-ETSU CHEMICAL CO., LTD.

A method for producing a silica glass preform for an optical fiber includes processes for producing a silica glass soot body having a core portion added with a positive dopant and an intermediate portion having a refractive index lower than that of the core portion, heating the soot body at a temperature for transparently vitrifying the same in a helium atmosphere containing a negative dopant and forming a first core rod having the intermediate portion added with the negative dopant, giving a silica glass soot layer as a trench portion to an outer circumference of the first core rod, heating the soot layer at a temperature for transparently vitrifying the same in the helium atmosphere and forming a second core rod having the trench portion added with the negative dopant, and giving silica glass as a cladding portion to an outer circumference of the second core rod. 1. A method for producing a silica glass preform for an optical fiber comprising:producing a silica glass soot body having a core portion located at the center and added with a positive dopant for increasing a refractive index of silica glass and an intermediate portion located on an outer circumference of the core portion and having a refractive index lower than that of the core portion;heating the silica glass soot body at a temperature for transparently vitrifying the silica glass soot body in a helium atmosphere containing a negative dopant raw material and forming a first transparent silica glass core rod having the intermediate portion to at least a portion of which a negative dopant is added;giving a silica glass soot layer as a trench portion to an outer circumference of the first core rod;heating the soot layer at a temperature for transparently vitrifying the soot layer in the helium atmosphere containing the negative dopant raw material and forming a second transparent silica glass core rod having the trench portion to entire of which the negative dopant is added; andgiving silica glass as a ...

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Номер записи: 99
06-08-2015 дата публикации

METHOD FOR PRODUCING AN OPTICAL PREFORM WITH A POD CLADDING GLASS LAYER

Номер: US20150218036A1
Автор: BAUER PETER, Bödiger Paul, Bräuer Karsten, Langner Andreas, Schmidt Richard, Schötz Gerhard, Schultheis Andreas
Принадлежит:

The invention relates to a plasma deposition process for producing an optical preform, which is characterized by a cladding glass layer having a non-round internal cross-section together with high fluorine doping and axially and radially specified dopant distribution, which in the simplest case is as uniform as possible. For this purpose, a two-stage method is proposed, wherein a substrate body having a non-round cross-section is first reshaped into a coated substrate body having a circular cross-section in that a POD filling layer made of quartz glass having the nominal fluorine concentration is deposited onto a present filling surface and rounded by grinding, and then in the second stage of the method a POD sheathing glass layer made of fluorine-doped quartz glass and having a circular-ring-shaped cross-section is deposited. 1. A method for producing an optical preform with a POD cladding glass layer of fluorine-doped quartz glass , said method comprising:{'sub': '2', 'claim-text': {'sub': '2', 'depositing said SiOparticles on an outer cylinder surface of a cylindrical substrate body having a longitudinal axis, and'}, 'forming SiOparticles with a plasma burner in the presence of fluorine,'}vitrifying said particles directly,said substrate body having a non-round cross-section taken perpendicular to the longitudinal axis including at least one surface section that extends between support points of an enveloping circle of said cross-section and that either has no curvature or has a curvature that is different from the curvature of the enveloping circle,wherein the forming, depositing and vitrifying steps include:(a) producing a POD filling layer of quartz glass with fluorine in a nominal concentration on said surface section, so as to form a coated substrate body, said coated substrate body having a circular cross-section having a radius that is at least as great as a radius of the enveloping circle; and(b) depositing a POD enveloping glass layer having a of ...

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Номер записи: 100