MULTI-CORE FIBER

A multi-core fiber () is a multi-core fiber including 10 or greater of even numbered cores and a cladding surrounding the core. In the even numbered cores, a half of cores () are disposed in such a manner that centers are located on the apexes of a regular polygon (RP) whose center is at an origin point (O) in a cladding (). In the even numbered cores, other cores () are disposed in a manner that centers are located on perpendicular bisectors (LV) of the edges of a regular polygon on the inner side of the regular polygon (RP). The other cores () are disposed in a specific range in the regular polygon (RP). 2. The multi-core fiber according to claim 1 , wherein each of the cores is surrounded by an inner cladding layer whose refractive index is lower than a refractive index of the core claim 1 , and a low refractive index layer whose average refractive index is lower than refractive indexes of the cladding and the inner cladding layer claim 1 , the low refractive index layer being surrounded by the cladding together with the inner cladding layer.3. The multi-core fiber according to claim 2 , wherein the low refractive index layer is formed of materials of a refractive index lower than the refractive indexes of the cladding and the inner cladding layer.4. The multi-core fiber according to claim 3 , wherein each of the cores is formed of pure silica.5. The multi-core fiber according to claim 2 , wherein the low refractive index layer is formed in a manner that a plurality of low refractive index portions is formed to surround the inner cladding layer in a material whose refractive index is the same as the refractive index of the cladding claim 2 , the low refractive index portion having a refractive index lower than the refractive index of the inner cladding layer.6. The multi-core fiber according to claim 1 , wherein an outer diameter of the cladding is 230 μm or less. The present invention relates to a multi-core fiber that can suppress crosstalk.Presently, optical ...

LASER SYSTEMS UTILIZING CELLULAR-CORE OPTICAL FIBERS FOR BEAM SHAPING

In various embodiments, the beam parameter product and/or beam shape of a laser beam is adjusted by directing the laser beam across a path along the input end of a cellular-core optical fiber. The beam emitted at the output end of the cellular-core optical fiber may be utilized to process a workpiece. 1. A laser system comprising:a beam emitter for emission of an input laser beam;a cellular-core optical fiber having an input end and an output end opposite the input end, the cellular-core optical fiber comprising (i) a plurality of core regions, (ii) an inter-core cladding region surrounding and extending between the core regions, and (iii) an outer cladding surrounding the inter-core cladding region, wherein a refractive index of each of the core regions is larger than a refractive index of the inter-core cladding region;a reflector for receiving the input laser beam and reflecting the input laser beam toward the cellular-core optical fiber;an optical element for receiving the input laser beam from the reflector and focusing the input laser beam toward the input end of the cellular-core optical fiber; anda controller for controlling relative motion between the input end of the cellular-core optical fiber and at least one of the reflector or the optical element to thereby direct the input laser beam along a path across the input end of the cellular-core optical fiber, the path comprising one or more of the core regions, whereby at least one of a beam shape or a beam parameter product of an output beam emitted at the output end of the cellular-core optical fiber is determined at least in part by the path of the input laser beam.2. The system of claim 1 , wherein the controller is configured to direct the input laser beam along a path comprising a plurality of core regions.3. The system of claim 2 , wherein the controller is configured to modulate the output power of the input laser beam as the input laser beam is directed along the path claim 2 , whereby the output ...

Multi-clad Optical Fiber

A multi-clad optical fiber design is described in order to provide low optical loss, a high numerical aperture (NA), and high optical gain for the fundamental propagating mode, the linearly polarized (LP) 01 mode in the UV and visible portion of the optical spectrum. The optical fiber design may contain dopants in order to simultaneously increase the optical gain in the core region while avoiding additional losses during the fiber fabrication process. The optical fiber design may incorporate rare-earth dopants for efficient lasing. Additionally, the modal characteristics of the propagating modes in the optical core promote highly efficient nonlinear mixing, providing for a high beam quality (M<1.5) output of the emitted light. 1. A fused silica based , multi-clad optical fiber comprising:a core surrounded by a first cladding layer, whereby the optical fiber has a high NA;{'sup': 2', '2, 'whereby the fiber is configured to convert low beam quality visible or UV light, having an M>>1.5, to high beam quality light, having an M<1.5;'}a hydrogen dopant, whereby the fiber is configured to provide low propagation losses in the visible or UV portions of the optical spectrum; and,the core comprising a GRIN structure.2. The fiber of claim 1 , wherein the GRIN structure comprises components selected from the group consisting of modifiers to the silica glass to alter the refractive index claim 1 , structures comprised of the silica glass to alter the effective refractive index claim 1 , and modifiers to the silica glass to shield the core from UV radiation.3. The fibers of or claim 1 , wherein the first cladding is surround by a second and the second cladding is surround by an outer cladding claim 1 , wherein each of the claddings comprises fused silica glass.4. The fibers of or claim 1 , wherein the first cladding is surround by a second and the second cladding is surround by an outer cladding claim 1 , wherein each of the claddings comprises fused silica glass with chemical ...

Multi-clad Optical Fiber

A multi-clad optical fiber design is described in order to provide low optical loss, a high numerical aperture (NA), and high optical gain for the fundamental propagating mode, the linearly polarized (LP) 01 mode in the UV and visible portion of the optical spectrum. The optical fiber design may contain dopants in order to simultaneously increase the optical gain in the core region while avoiding additional losses during the fiber fabrication process. The optical fiber design may incorporate rare-earth dopants for efficient lasing. Additionally, the modal characteristics of the propagating modes in the optical core promote highly efficient nonlinear mixing, providing for a high beam quality (M<1.5) output of the emitted light. 118-. (canceled)19. A method of converting low beam quality light to high beam quality of light , the method comprising:{'sup': '2', 'claim-text': (i) a silica glass;', '(ii) a core surrounded by a first cladding layer, whereby the fused silica based, multi-clad optical fiber has a high NA;', '(iii) the core comprising a GRIN structure; and,', '(iv) a hydrogen dopant;', '(v) whereby the fused silica based, multi-clad optical fiber is configured to provide low propagation losses in the visible or UV portions of the optical spectrum, '(a) directing a laser beam having a wavelength in the UV and visible wavelength ranges and an M>1.5 into a fused silica based, multi-clad optical fiber comprising{'sup': '2', '(b) converting the laser beam in the multi-clad optical fiber to high beam quality light having an M<1.5.'}201. The method of claim , wherein the GRIN structure comprises components selected from the group consisting of modifiers to the silica glass to alter the refractive index , structures comprised of the silica glass to alter the effective refractive index , and modifiers to the silica glass to shield the core from UV radiation.2112. The method of claim or , wherein the first cladding is surround by a second and the second cladding is ...

SMALL CORE-DIAMETER GRADED-INDEX OPTICAL FIBER

A small core-diameter graded-index optical fiber include a core layer and a cladding having an inner cladding layer, a depressed cladding layer, and an outer cladding layer from inside to outside thereof. The core layer has a parabolic refractive index profile with a distribution index in a range of 1.9-2.1, a radius in a range of 10-21 μm, and a Δ1 max in a range of 0.7-1.7% at a core layer center, and is a silica glass layer co-doped with germanium, phosphorus, and fluoride. The inner cladding layer is a pure silica layer or an F-doped silica glass layer, and has a unilateral width in a range of 0.5-5 μm and a Δ2 in a range of −0.4-0%. The depressed cladding layer has a unilateral width in a range of 2-10 μm and a Δ3 in a range from −0.8% to −0.2%. The outer cladding layer is a pure silica glass layer. 1. A small core-diameter graded-index optical fiber , comprising:a core layer and a cladding that includes an inner cladding layer, a depressed cladding layer, and an outer cladding layer from inside to outside thereof,wherein the core layer has a parabolic refractive index profile with a distribution index α in a range from 1.9 to 2.1, a radius R1 in a range from 10 to 21 μm, and a maximum relative refractive index difference Δ1 max in a range from 0.7% to 1.7% at a core layer center, and is a silica glass layer co-doped with germanium Ge, phosphorus P, and fluoride F;wherein the inner cladding layer is a pure silica layer or an F-doped silica glass layer, and has a unilateral width R2−R1 in a range from 0.5 to 5 μm and a relative refractive index difference Δ2 in a range from −0.4% to 0%;wherein the depressed cladding layer has a unilateral width R3−R2 in a range from 2 to 10 μm and a relative refractive index difference Δ3 in a range from −0.8% to −0.2%; andwherein the outer cladding layer is a pure silica glass layer.2. The small core-diameter graded-index optical fiber according to claim 1 , wherein P and Ge are used as positive dopants in the core layer claim ...

Optical device and optical device manufacturing method

Provided is an optical device whose resin member is less likely to reach a high temperature, as compared with that of a conventional optical device. The optical device ( 1 ) includes (i) an optical fiber ( 11 ) in which a jacket-removed section (I 1 ) is provided and (ii) a resin member ( 12 ) in which the jacket-removed section (I 1 ) is embedded. The jacket-removed section (I 1 ) is a section in which a part of a jacket ( 112 ) covering an outer surface of a cladding ( 111 b ) is removed so that only a part of the outer surface of the cladding ( 111 b ) is exposed in a cross section of the optical fiber ( 11 ).

Optical fiber structures and methods for beam shaping

In various embodiments, optical fibers have arrangements of core, annular core, and cladding regions enabling variation of beam shape and/or beam parameter product and may be utilized for the processing (e.g., welding, cutting, drilling, etc.) of various workpieces.

AMPLIFICATION OPTICAL FIBER AND LASER DEVICE

An amplification optical fiber according to the present invention includes: a core doped with an active element, through which multi-mode light propagates; an inner cladding that surrounds the core and has a refractive index lower than that of the core; and an outer cladding that surrounds the inner cladding and has a refractive index lower than that of the inner cladding. The inner cladding has a polygonal outline in a cross section perpendicular to the longitudinal direction, and the inner cladding has a permanent twist applied by turning around the central axis of the core. 1. An amplification optical fiber comprising:a core doped with an active element, through which multi-mode light propagates;an inner cladding that surrounds the core and has a refractive index lower than a refractive index of the core; andan outer cladding that surrounds the inner cladding and has a refractive index lower than the refractive index of the inner cladding, whereinthe inner cladding has a polygonal outline in a cross section perpendicular to a longitudinal direction, andthe inner cladding has a permanent twist around a central axis of the core.2. The amplification optical fiber according to claim 1 , wherein the permanent twist has at least three but less than 30 turns per a length of one meter in a direction parallel to the longitudinal direction.3. The amplification optical fiber according to claim 1 , wherein a relative refractive index difference between the inner cladding and the core is 0.08% or higher.4. The amplification optical fiber according to claim 1 , wherein a difference in propagation constant between light in an LPmode and light in an LPmode propagating through the core is 1000/m or larger.5. The amplification optical fiber according to claim 1 , wherein light as an effective cross section of light propagating through the core is 300 μmor larger.6. The amplification optical fiber according to claim 1 , wherein a theoretical cutoff wavelength of light in an LPmode ...

OPTICAL FIBERS AND OPTICAL SYSTEMS COMPRISING THE SAME

An optical fiber for converting a Gaussian laser beam into a Bessel laser beam may include a first segment optically coupled to a second segment with a transition region, the first segment having a first outer diameter greater than a second outer diameter of the second segment. The first segment may include a first core portion with a first cladding portion extending around the first core portion. The first core portion may have an annular core region with a relative refractive index relative to the first cladding portion. The second segment may include a second core portion with a second cladding portion extending around the second core portion. The second core portion has a relative refractive index relative to the second cladding portion and the relative refractive index of the first annular core region may be substantially equal to the relative refractive index of the second core portion. 1. An optical fiber comprising: [{'sub': 1', '0', 'AC', '1', '0, 'a first core portion having a radius Rfrom an axial centerline of the optical fiber, the first core portion comprising a first annular core region centered on the axial centerline of the optical fiber and having an inner radius Rand a first radial thickness T=R−R; and'}, {'sub': CL', 'AC, 'a first cladding portion extending around the first core portion, the first cladding portion having a radial thickness T, the first annular core region having a relative refractive index Δ% relative to the first cladding portion;'}], 'a first segment comprising [{'sub': 1', '1', '1, 'a second core portion having a radius rfrom the axial centerline of the optical fiber, wherein at least a portion of the second core portion is optically coupled to the first annular core region and the radius Ris greater than the radius r; and'}, {'sub': cl', 'CL', 'c', 'AC', 'c, 'a second cladding portion extending around the second core portion, the second cladding portion having a radial thickness tthat is less than the radial thickness Tof the ...

ANTI-RESONANT HOLLOW CORE OPTICAL FIBER HAVING MULTIPLE RESONANT LAYERS

An anti-resonant hollow core optical fiber having multiple resonant layers. The optical fiber comprises a low-refractive index core region () and a high-refractive index cladding region. The high-refractive index cladding region comprises an inner cladding region () and an outer cladding region (). The outer cladding region () clads the inner cladding region () and the core region (). The inner cladding region () comprises a first anti-resonant layer () and a second anti-resonant layer (), and the first anti-resonant layer () and the second anti-resonant layer () surround the core region (); and the first anti-resonant layer () comprises several layers of microcapillary tubes, and the second anti-resonant layer () supports the first anti-resonant layer (). The optical fiber adopts a double-cladding structure and uses two or more anti-resonant layers such that theoretically simulated loss is reduced to 0.1 dB/km, and has the features of ultralow transmission loss, wide spectral bandwidth, low bending loss, low transmission loss, high damage threshold and single-mode transmission. 1. An anti-resonant hollow core optical fiber , comprising a low-refractive index core region and a high-refractive index cladding region , wherein the high-refractive index cladding region comprises an inner cladding region and an outer cladding region , the outer cladding region clads the inner cladding region and a fiber core region , the inner cladding region comprises a first anti-resonant layer and a second anti-resonant layer , and the first anti-resonant layer and the second anti-resonant layer surround the fiber core region; the first anti-resonant layer comprises several layers of microcapillary tubes , and the second anti-resonant layer supports the first anti-resonant layer.2. The anti-resonant hollow core optical fiber according to claim 1 , wherein the high-refractive index cladding region comprises silicon dioxide claim 1 , soft glass or plastic.3. The anti-resonant hollow ...

SINGLE MODE OPTICAL FIBERS WITH LOW CUTOFF WAVELENGTH HIGH MECHANICAL RELIABILITY

The optical fibers disclosed is a single mode optical fiber having a core region and a cladding region surrounding and directly adjacent to the core region. The core region can have a radius rin a range from 3.0 microns to 6.0 microns and a core volume Vless than 6.0%-micron. The cladding region can include a first outer cladding region and a second outer cladding region surrounding and directly adjacent to the first outer cladding region. The first outer cladding region can have a radius r, the second outer cladding region can have a radius rless than or equal to 65 microns and comprising silica based glass doped with titania. The disclosed single mode optical fiber can have a fiber cutoff wavelength λless than 1530 nm. 1. A single mode optical fiber , comprising:{'sub': 1', '1, 'sup': '2', 'a core region, the core region having a radius rin a range from 3.0 microns to 6.0 microns and a core volume Vless than 6.0%-micron;'}{'sub': '4a', 'a cladding region surrounding and directly adjacent to the core region, the cladding region including a first outer cladding region and a second outer cladding region surrounding and directly adjacent to the first outer cladding region, the first outer cladding region having a radius r, the second outer cladding region having a radius rob less than or equal to 65 microns and comprising silica based glass doped with titania;'}{'sub': 'CF', 'wherein the single mode optical fiber has a fiber cutoff wavelength λless than 1530 nm.'}2. The single mode optical fiber of claim 1 , wherein the radius ris in a range from 3.5 microns to 5.5 microns.3. The single mode optical fiber of claim 1 , wherein the core volume Vis greater than the 3.0%-micron.4. The single mode optical fiber of claim 1 , wherein the core region has a maximum relative refractive index Δin a range from 0.25% to 0.40%.5. The single mode optical fiber of claim 1 , wherein the core region has a graded-index relative refractive index profile.6. The single mode optical fiber ...

AMPLIFYING OPTICAL FIBER AND OPTICAL AMPLIFIER

The first cladding has a two-layer structure formed of a solid inner layer A passed through the center axis of the first cladding and an outer layer B enclosing the inner layer A and the plurality of cores with no gap. A refractive index n of the core is provided higher than refractive indexes nand nof the inner layer A and the outer layer B, the refractive indexes nA and nB of the inner layer A and the outer layer B are provided higher than a refractive index n of the second cladding and the refractive index nof the inner layer A is provided lower than the refractive index nof the outer layer B. 1. An amplifying optical fiber comprising:a plurality of cores to which an active element is doped;a first cladding enclosing the plurality of cores with no gap; anda second cladding enclosing the first cladding, wherein:the plurality of cores is disposed around a center axis of the first cladding;the first cladding has a two-layer structure formed of a solid inner layer passed through the center axis of the first cladding and an outer layer enclosing the inner layer and the plurality of cores with no gap;a refractive index of the core is provided higher than refractive indexes of the inner layer and the outer layer;the refractive indexes of the inner layer and the outer layer are provided higher than a refractive index of the second cladding; andthe refractive index of the inner layer is provided lower than the refractive index of the outer layer.2. The amplifying optical fiber according to claim 1 , wherein an area other than the center axis of the first cladding on one end face of the first cladding is an incident point of pumping light.3. The amplifying optical fiber according to claim 2 , wherein an outer layer area on one end face of the first cladding is an incident point of the pumping light.4. The amplifying optical fiber according to claim 2 , wherein an area other than a inner layer area located on an inner side with respect to the plurality of cores is an ...

Single mode lma (large mode area) fiber

Large mode area optical fibers include cores that are selected to be smaller than a core size associated with a minimum mode field diameter of a lowest order mode. Cross-sectional shape of such cores can be circular or annular, and a plurality of such cores can be used. Gain regions can be provided in cores or claddings, and selected to produce a selected state of polarization.

FEW MODE OPTICAL FIBER

The present disclosure provides a few mode optical fiber (). The few mode optical fiber () includes a core region (). A core region () defined by a region around a central longitudinal axis () of the few mode optical fiber (). In addition, the core region () has a first annular region () extended from central longitudinal axis () to radius r, a second annular region () extended from radius rto radius r, a third annular region () extended from radius rto radius r, a fourth annular region () extended from radius rto radius rand a fifth annular region () extended from radius rto radius r. Also, the few mode optical fiber () has a cladding defined by the sixth annular region () extended from radius rto radius r. 1) A few mode optical fiber comprising: a first annular region having a first refractive index, defined by the central longitudinal axis and a first radius,', 'a second annular region having a second refractive index, between the first radius and a second radius, and', 'a third annular region having a third refractive index, between the second radius and a third radius,', 'a fourth annular region a fourth refractive index, wherein the fourth annular region is between the third radius and a fourth radius, and', 'a fifth annular region having a fifth refractive index, wherein the fifth annular region is between the fourth radius and a fifth radius; and, 'a core region, defined by a region around a central longitudinal axis of the few mode optical fiber, wherein the core region further comprises at least one ofa cladding region that is a sixth annular region between the fifth radius and a sixth radius, having a sixth refractive index;{'b': 01', '11, 'wherein the few mode optical fiber is operated in six modes including two degenerate Lp modes and four degenerate Lp modes.'}2) The few mode optical fiber of claim 1 , wherein at least one of the first radius is in a range of 3.8 microns to 4.2 microns claim 1 , the first refractive index is in a range of 0.42 to 0.70 ...

Mode Mixing Optical Fibers and Methods and Systems Using the Same

The present disclosure relates more to mode mixing optical fibers useful, for example in providing optical fiber laser outputs having a desired beam product parameter and beam profile. In one aspect, the disclosure provides a mode mixing optical fiber for delivering optical radiation having a wavelength, the mode mixing optical fiber having an input end, an output end, a centerline and a refractive index profile, the mode mixing optical fiber comprising: an innermost core, the innermost core having a refractive index profile; and a cladding disposed about the innermost core, wherein the mode mixing optical fiber has at least five modes at the wavelength, and wherein the mode mixing optical fiber is configured to distribute a fraction of the light input at its input end from its lower-order modes to its higher-order modes. 1. A mode mixing optical fiber for delivering optical radiation having a wavelength , the mode mixing optical fiber having an input end , an output end , a centerline and a refractive index profile , the mode mixing optical fiber comprising:an innermost core for optical radiation having the wavelength, the innermost core having a refractive index profile and a centerline; anda cladding disposed about the innermost core;wherein the refractive index profile of the innermost core comprises one or more substantially doped regions disposed asymmetrically with respect to the centerline of the innermost core, each of the substantially doped regions being substantially up-doped or substantially down-doped;wherein the mode mixing optical fiber has at least seven modes at the wavelength;wherein the refractive index profile of the innermost core is configured to distribute a fraction of the optical radiation input to the optical fiber at its input end from its lower-order modes to its higher-order modes as the optical radiation propagates toward the output end.2. The mode mixing optical fiber according to claim 1 , wherein the mode mixing optical fiber has at ...

小芯径渐变折射率光纤

本发明涉及一种小芯径渐变折射率光纤，包括有芯层和包层，包层由内到外依次为内包层、下陷包层和外包层，其特征在于芯层折射率剖面呈抛物线形，分布指数α为1.9～2.1，芯层的半径R1为10～21μm，芯层中心最大相对折射率差Δ1max为0.7％～1.7％；芯层为锗磷氟Ge、P、F共掺的二氧化硅玻璃层，内包层为纯二氧化硅层或掺F的二氧化硅玻璃层，单边宽度为0.5～5μm，Δ2为‑0.4％～0％，下陷包层单边宽度为2～10μm，Δ3为‑0.8％～‑0.2％；外包层为纯二氧化硅玻璃层。本发明光纤不仅能与现有OM3/OM4多模光纤兼容，还能支持850nm～950nm波长范围内的波分复用技术；并能与单模光纤兼容，支持1310nm和1550nm的单模传输；本发明具有优异的抗弯曲性能，可适用于接入网和小型化光器件中。

利用蜂窝芯光纤进行光束整形的激光系统

在各种实施例中，通过沿着蜂窝芯光纤的输入端引导激光束穿过一路径来调节激光束的光束参数乘积和/或光束形状。可以使用在蜂窝芯光纤的输出端发射的光束加工工件。

Optical fiber, transmission system and multiple-wavelength transmission system

광섬유는 상기 광섬유 내에서 발생하는 음향 모드의 기본 모드의 제1 모드 필드 지름이 해당 광섬유의 광강도 분포의 제2 모드 필드 지름과 다르다. 또, 이 광섬유를 이용하여 아날로그 신호전송 또는 베이스밴드 전송 또는 광 SCM 전송을 수행하도록 전송 시스템이 구성되어 있다. In an optical fiber, the first mode field diameter of the basic mode of the acoustic mode occurring in the optical fiber is different from the second mode field diameter of the light intensity distribution of the optical fiber. In addition, a transmission system is configured to perform analog signal transmission, baseband transmission or optical SCM transmission using this optical fiber. 광섬유, 음향 모드, 필드 지름, 광강도 분포, 음향 필드 분포 Fiber Optic, Acoustic Mode, Field Diameter, Light Intensity Distribution, Acoustic Field Distribution

Optical fiber comprising first cladding and second cladding having different refractive indices

直径がD c であり、屈折率がn c であるコアと、このコアを同心状に取り囲み、外径がd pc であり、このコアの屈折率n c よりも小さな屈折率n pc を有する第１クラッドと、この第１クラッドを同心状に取り囲み、外径がd sc であり、第１クラッドの屈折率n pc よりも小さな屈折率n sc を有する第２クラッドと、を有する光ファイバーである。 【選択図】図４

Optical fibers and optical systems comprising the same

An optical fiber for converting a Gaussian laser beam into a Bessel laser beam may include a first segment optically coupled to a second segment with a transition region, the first segment having a first outer diameter greater than a second outer diameter of the second segment. The first segment may include a first core portion with a first cladding portion extending around the first core portion. The first core portion may have an annular core region with a relative refractive index relative to the first cladding portion. The second segment may include a second core portion with a second cladding portion extending around the second core portion. The second core portion has a relative refractive index relative to the second cladding portion and the relative refractive index of the first annular core region may be substantially equal to the relative refractive index of the second core portion.

Multi-Coated Fiber

광학 스펙트럼의 UV 및 가시 부분에서 낮은 광학 손실, 높은 수치의 조리개(NA) 및 기본 전파 모드인 선형 편광(LP) 01 모드에 대한 높은 광학 이득을 제공하기 위해서 다중-피복 광섬유 설계가 설명된다. 광섬유 설계는 섬유 제조 공정 동안 추가 손실을 피하면서 코어 영역에서 광학 이득을 동시에 증가시키기 위해서 도펀트를 함유할 수 있다. 광섬유 설계는 효과적인 레이징을 위해 희토류 도펀트를 포함할 수 있다. 또한, 광학 코어에서 전파 모드의 모달 특성은 고효율 비선형 혼합을 촉진하여 방출된 광의 높은 빔 품질(M 2 < 1.5) 출력을 제공한다. A multi-clad fiber optic design is described to provide low optical loss in the UV and visible portions of the optical spectrum, high numerical aperture (NA) and high optical gain for the linear polarization (LP) 01 mode, which is the fundamental propagation mode. The optical fiber design may contain dopants to simultaneously increase the optical gain in the core region while avoiding additional losses during the fiber fabrication process. The optical fiber design may include rare earth dopants for effective lasing. In addition, the modal nature of the propagation mode in the optical core promotes high-efficiency non-linear mixing, providing a high beam quality (M 2 <1.5) output of the emitted light.

Mode mixture optical fiber and use its method and system

本公开更多地涉及模式混合光纤，所述模式混合光纤可用于例如提供具有期望波束乘积参数和波束分布的光纤激光输出。在一个方面，本公开提供一种用于传送具有波长的光辐射的模式混合光纤，所述模式混合光纤具有输入端、输出端、中心线和折射率分布，所述模式混合光纤包括：最内芯，所述最内芯具有折射率分布；和包层，所述包层围绕所述最内芯设置，其中所述模式混合光纤在所述波长具有至少五个模式，并且其中所述模式混合光纤被配置为将其输入端处的光输入的一部分从其较低阶模式分配到其较高阶模式。

Single mode optical fiber

Endoscopic imaging probe comprising dual clad fibre

Multimode optical fiber

本发明涉及多模光纤，公开了一种凹式渐变折射率多模光纤。该凹式渐变折射率多模光纤包括中央纤芯、凹陷内包层、凹槽、凹陷外包层和外包层。该中央纤芯具有α折射率分布。这些凹陷包层限制了泄漏模式对光纤的性能特性(例如，带宽、纤芯大小和/或数值孔径)所产生的影响。

Fiber-optic structure for effective application of pumping radiation, optical pumping-radiation intensifying system, and fiber-optic structure for intensifying pumping radiation

FIELD: fiber optics. SUBSTANCE: radiation-intensifying fiber-optic structure has at least one core selectively doped with active radiation intensifying particles and internal shell surrounding the core and used for reception of multimode pumping-radiation energy from external source, its localization, and transmission to core by multiple interaction with active particles of core as pumping radiation propagates along optical fiber. Cross-sectional area of internal shell is other-than-rectangular convex polygon. Actually uniform radiation field is built up within core using isotope distribution of various radiation modes carrying pumping energy. EFFECT: optimal effectiveness of radiation transmission afforded by optical fiber. 32 cl, 21 dwg Усс ПЧ Го (19) РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ ВИ” 2 153 214 ' (51) МПК? 13) СЛ Н ОЛ $ 3/06, 3/091, С 02 В 6/22 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 97103520/28, 24.07.1995 (24) Дата начала действия патента: 24.07.1995 (30) Приоритет: 29.07.1994 Ц$ 08/283.226 (46) Дата публикации: 20.07.2000 (56) Ссылки: 4$ 5268978 А, 07.12.1993. ЕР 0496603 АЛ, 29.07.1992. $Ц 1144076 07.03.1985. ($ 4829529 А, 09.05.1989. (85) Дата перевода заявки РСТ на национальную фазу: 28.02.1997 (86) Заявка РСТ: 0$ Э509ЗЛ1 (24.07.1995) (87) Публикация РСТ: М/О 96/04700 (15.02.1996) (98) Адрес для переписки: 101000, Москва, пер. Малый Златоустинский 10, кв.15, "ЕВРОМАРКПАТ", Веселицкой И.А. (71) Заявитель: СДЛ, Инк. (ЦЗ) (72) Изобретатель: Мюндел Мартин Х. (1$) (73) Патентообладатель: СДЛ, Инк. (43) (54) ОПТОВОЛОКОННАЯ СТРУКТУРА ДЛЯ ЭФФЕКТИВНОГО ИСПОЛЬЗОВАНИЯ ИЗЛУЧЕНИЯ НАКАЧКИ, ОПТИЧЕСКАЯ СИСТЕМА УСИЛЕНИЯ ИЗЛУЧЕНИЯ НАКАЧКИ И ОПТОВОЛОКОННАЯ СТРУКТУРА ДЛЯ УСИЛЕНИЯ ИЗЛУЧЕНИЯ НАКАЧКИ (57) Реферат: Изобретение относится К вВолоконной оптике. Оптоволоконная структура для усиления излучения состоит по крайней мере из ОДНОЙ сердцевины, селективно легированной активными усиливающими излучение частицами, и — ...

Method of converting low beam quality to higher beam quality

【課題】低い光損失、高い開口数（ＮＡ）、及び基本伝搬モードである直線偏光（ＬＰ）０１モードについての高い光学利得を光スペクトルのＵＶ部分及び可視部分において提供する。【解決手段】マルチクラッド光ファイバ設計が記載されている。光ファイバ設計は、コア領域での光学利得を増加させると同時にファイバ製作プロセス中の追加の損失を回避するために、ドーパントを含有することができる。光ファイバ設計は、効率的レージングのために希土類ドーパントを組み入れることができる。加えて、光学コア内の伝搬モードのモード特性が、極めて効率的な非線形混合を促進し、放射光線の高いビーム品質（Ｍ２＜１．５）出力を提供する。【選択図】図１

Imaging system and related techniques

A method and apparatus for imaging using a double-clad fiber is described.

Optical fiber and fibre-optical preform

本发明提供了一种光纤和光纤预制件，其中该光纤含有碱金属元素并且显示低衰减以及优异的耐辐射性的光纤。本发明的光纤具有芯区域和包围该芯区域的包层区域。该芯区域含有平均浓度为0.2原子ppm以上的碱金属元素。与辐射暴露之前所显示的衰减相比，在暴露在累积吸收剂量为0.10Gy的辐射后，所述光纤在1550nm波长处的衰减增量为0.02dB/km以下。

Optical device and optical device manufacturing method

Provided is an optical device whose resin member is less likely to reach a high temperature, as compared with that of a conventional optical device. The optical device ( 1 ) includes (i) an optical fiber ( 11 ) in which a jacket-removed section (I 1 ) is provided and (ii) a resin member ( 12 ) in which the jacket-removed section (I 1 ) is embedded. The jacket-removed section (I 1 ) is a section in which a part of a jacket ( 112 ) covering an outer surface of a cladding ( 111 b ) is removed so that only a part of the outer surface of the cladding ( 111 b ) is exposed in a cross section of the optical fiber ( 11 ).

Multi-clad doped optical fiber

The invention provides a multi-clad fiber, with three claddings or more, where at least one intermediate cladding is inserted between an inner core and an outer core of the multi-clad fiber, for enlarging the cross-section of the fiber core or for increasing the dopant density in the core. The invention also provides an intermediate cladding having a multi-layer structure to better confine the pump power in a suitable pumping region of the fiber.

Multimode waveguide configured to generate single-mode radiation from single-mode radiation.

- Guide d’onde multimode configuré pour générer une radiation monomode à partir d’une radiation monomode. - Le guide d’onde (1) présente un profil d’indice comprenant au moins un maximum, le ou les maxima du profil d’indice correspondant respectivement à au moins un maximum d’intensité de la radiation de sortie (11) à un mode d’ordre souhaité, le guide d’onde (1) présentant également au moins un ion dopant configuré pour absorber la radiation de pompe (31), le ou les ions dopants présentant un profil de concentration d’ions dopants comprenant au moins un maximum. Figure pour l’abrégé : Fig. 1 - Multi-mode waveguide configured to generate single-mode radiation from single-mode radiation. - The waveguide (1) has an index profile comprising at least one maximum, the maxima or maxima of the index profile corresponding respectively to at least one maximum intensity of the output radiation (11) at a desired order mode, the waveguide (1) also exhibiting at least one dopant ion configured to absorb pump radiation (31), the dopant ion (s) exhibiting a dopant ion concentration profile comprising at least one maximum. Figure for the abstract: Fig. 1

INJECTION DEVICE FOR OPTICAL FIBER AND PREPARATION METHOD

INJECTION DEVICE FOR OPTICAL FIBER AND PROCESS FOR PREPARATION

The invention concerns an injection device for optical fibre characterised in that it comprises a main fibre (100), and an auxiliary fibre (200) whereof the bevelled end (210) is placed on the edge of the main fibre (100), wherein the auxiliary fibre (200) has a numerical aperture smaller than the numerical aperture of the main fibre (100). The invention also concerns a method for preparing said device.

Multimode waveguide configured to generate singlemode radiation from singlemode radiation.

- Guide d’onde multimode configuré pour générer une radiation monomode à partir d’une radiation monomode. - Le guide d’onde (1) présente un profil d’indice comprenant au moins un maximum, le ou les maxima du profil d’indice correspondant respectivement à au moins un maximum d’intensité de la radiation de sortie (11) à un mode d’ordre souhaité, le guide d’onde (1) présentant également au moins un ion dopant configuré pour absorber la radiation de pompe (31), le ou les ions dopants présentant un profil de concentration d’ions dopants comprenant au moins un maximum. Figure pour l’abrégé : Fig. 1 - Multimode waveguide configured to generate singlemode radiation from singlemode radiation. - The waveguide (1) has an index profile comprising at least one maximum, the maxima or maxima of the index profile corresponding respectively to at least one intensity maximum of the output radiation (11) at a desired order mode, the waveguide (1) also having at least one dopant ion configured to absorb pump radiation (31), the dopant ion(s) having a dopant ion concentration profile comprising at least one maximum. Figure for the abstract: Fig. 1

Mode-mixing optical fibers and methods and systems using the same

【課題】本開示は、例えば、所望のビーム積パラメータ及びビームプロファイルを有する光ファイバレーザ出力を提供する際に有用なモード混合光ファイバにより関する。【解決手段】一態様では、本開示は、波長を有する光放射を送達するためのモード混合光ファイバを提供し、モード混合光ファイバが、入力端、出力端、中心線、及び屈折率プロファイルを有し、モード混合光ファイバが、最内コアであって、屈折率プロファイルを有する、最内コアと、最内コアの周りに配置されたクラッドと、を備え、モード混合光ファイバが、該波長において少なくとも５つのモードを有し、モード混合光ファイバは、その入力端で光入力の一部をその低次モードからその高次モードに分配するように構成される。【選択図】図２２

Injection device for optical fibre and preparation method

The invention concerns an injection device for optical fibre characterised in that it comprises a main fibre (100), and an auxiliary fibre (200) whereof the bevelled end (210) is placed on the edge of the main fibre (100), wherein the auxiliary fibre (200) has a numerical aperture smaller than the numerical aperture of the main fibre (100). The invention also concerns a method for preparing said device.

Triple-clad rare-earth doped optical fiber and applications

An optical fiber comprises a singlemode core, and an inner cladding disposed around said core, an intermediate cladding disposed around said inner cladding and an outer cladding disposed around said intermediate cladding thereby forming a triple-clad geometry. The core is doped with rare-earth elements and represents the waveguide section of higher refractive index through which the signal is transmitted and amplified. A fiber coating is provided around said outer cladding. The core has a higher refractive index than said inner cladding, said inner cladding having a higher refractive index than said intermediate cladding, and said intermediate cladding having a higher refractive index than said outer cladding. The inner cladding has a fairly high refractive index to limit the numerical aperture (NA) of said core. The inner cladding is within said intermediate, larger, cladding which is made of glass, that is used to guide multimode, high-power pump, said inner cladding acting as an intermediate level between said core and said multi-mode pump guiding intermediate cladding, with said outer cladding being present in said optical fiber for allowing said intermediate cladding to guide the pump power properly. The outer cladding is made of glass or of a low-index polymer material. The inner cladding is adapted to trap some of the pump signal into a smaller section in order to accelerate the absorption of the pump power.

Optical fiber preform

An optical fiber containing an alkali metal element and exhibiting low attenuation as well as excellent radiation resistance is provided. The optical fiber of the present invention has a core region and a cladding region enclosing the core region. The core region contains alkali metal elements by an average concentration of 0.2 atomic ppm or more. The attenuation at a wavelength of 1550 nm after irradiating with the radiation of 0.10 Gy or more of cumulative absorbed dose increases by 0.02 dB/km or less as compared with the attenuation exhibited prior to radiation exposure.

Optical fiber and optical fiber preform

An optical fiber is constituted by: a three-layer structured core which includes, a first core (having a relative refractive index difference of Δ 1 in a region of a radius of R 1 ), a second core (having a relative refractive index difference of Δ 2 in a region from the radius R 1 to a radius of R 2 ), and a third core (having a relative refractive index difference of Δ 3 in a region from the radius of R 2 to a radius of R 3 ), wherein the relative refractive index differences have relationships of Δ 1>Δ2, Δ3>Δ2 , and Δ 3>Δ1 , when Δ 1−Δ2 =X and Δ 3−Δ2 =Y, (X+Y)>0.4% is satisfied, and X and Y satisfy 0.25%<X<0.6%, 0.1%≦Y≦0.6%, and a relationship of (2*X−0.7)%<Y<(X/2+0.4)%, thereby satisfying the G652 standard and having an SBS threshold equal to or higher than that of an optical fiber having the same MFD by +3 dB or higher.

Optical fiber and optical fiber preform

An optical fiber containing an alkali metal element and exhibiting low attenuation as well as excellent radiation resistance is provided. The optical fiber of the present invention has a core region and a cladding region enclosing the core region. The core region contains alkali metal elements by an average concentration of 0.2 atomic ppm or more. The attenuation at a wavelength of 1550 nm after irradiating with the radiation of 0.10 Gy or more of cumulative absorbed dose increases by 0.02 dB/km or less as compared with the attenuation exhibited prior to radiation exposure.

Single mode fiber

本发明涉及一种光纤通信系统中使用的低衰减单模光纤，包括有芯层和包层，芯层的相对折射率差Δ1范围为-0.1％至+0.1％，半径R1的范围是4.0μm至6.0μm，围绕在芯层外有三个包层；第一包层相对折射率差Δ2的范围是-0.2％至-0.6％，半径R2的范围是10μm至22μm；第二包层相对折射率差Δ3小于Δ2，并且第一包层的相对折射率差、半径与第二包层的相对折射率差、半径存在以下的数值关系：设V＝(Δ2-Δ3)×(R3-R2)，则V值的范围为0.15％μm至0.8％μm；第三包层为紧密围绕第二包层的所有分层，其各个分层的相对折射率差大于Δ3。本发明提供一种折射率剖面设计合理、光纤的抗弯曲性能得到进一步提高的低衰减单模光纤。

Double cladding fiber and optical fiber amplifier

A double cladding fiber and an optical fiber amplifier, which have a function equivalent to that of a pumping light cut filter with a simple structure are provided. In the double cladding fiber, a core transmitting a signal light is covered with a first clad having a refractive index of n 7 b. A second clad having a refractive index of n 7 c, covers the surrounding surface of the first clad. At an output end of the fiber, a designated length of the second clad is removed and a substance having a refractive index of “n” (“n”>n 7 b ) is coated on the first clad where the second clad has been removed. With this structure, a remaining pumping light leaks to this coated part. That is, and the substance coated part works as a filter for the remaining pumping light. As a result, a signal to noise ratio (SNR) of the amplified signal light is improved with a simple structure.

Multi-air cladding anti-bending optical fiber and manufacturing method thereof

本发明公开了一种多空气包层的抗弯曲光纤及其制造方法，所述光纤由内至外依次包括：纤芯（1）、第一包层（2）、第二包层（3）、第三包层（4）、第四包层（5）和第五包层（6）；所述第一包层（2）为外壁呈多边形的全固二氧化硅玻璃包层；所述第三包层（4）为内设有多个等间距分布的第一空气孔（7）的环形空气包层；所述第二包层（3）为形成于第一包层（2）和第三包层（4）之间的空气包层，所述第一包层（2）的每个角均与第三包层（4）的内壁固定连接；所述第四包层（5）为内设有至少一对对称分布的双螺旋支撑柱（8）的环形空气包层。本发明所提出的光纤适用于光纤到户的应用环境，具有更高的弯曲特性，便于布线、收纳和卷曲。

Single mode optical fiber

A single mode optical fiber comprises from center to periphery a core, at least first and second depressed claddings, and an outer cladding. The core has a radius (R co ) comprised between 3.5 µm and 5.5 µm and an index difference with the outer cladding (Dn co -Dn out ) comprised between 0 and 3.10 -3 ; the first depressed cladding has a radius (R cl1 ) comprised between 9 µm and 15 µm and an index difference with the outer cladding (Dn cl1 -Dn out ) comprised between -5.5.10 -3 and -2.5.10 -3 ; the second depressed cladding has a radius (R cl2 ) comprised between 38 µm and 42 µm and an index difference with the first depressed cladding (Dn cl2 -Dn cl1 ) comprised between -0.5.10 -3 and 0.5.10 -3 ; and the outer cladding has a radius comprised between 61,5 µm and 63,5 µm. A fiber with reduced attenuation can be manufactured at reduced cost.

Optical fiber with primary and secondary claddings having different refractive indices

An optical fiber has a core with a diameter Dc and a refractive index nc; a primary cladding concentrically surrounding the core and having an outer diameter dpc and a refractive index npc less than the core refractive index nc; and a secondary cladding concentrically surrounding the primary cladding and having an outer diameter dsc and a refractive index nsc less than the primary cladding refractive index npc.

Dual-band bend tolerance optical waveguide

An optical waveguide, such as an optical fiber, including a core having a refractive index n co and a radius r co ; an inner cladding laterally surrounding the5 core, the inner cladding having a refractive index n ic and an outer radius of r ic ; an outer cladding laterally surrounding the inner cladding, the outer cladding having a refractive index n oc ; and a narrow depressed well, wherein n co > n oc > > n ic . The range of the ratio of the inner, depressed-well clad radius, r ic , to core radius, r co , varies from 2.4 to 3.0. The waveguide has a +Δ of 0.0014 to 0.0021, a -Δ of -10 0.0021 to--0.0034, and a Δ tot of 0.0043 to 0.0049.

Optical fibre and optical fibre workpiece

FIELD: physics. SUBSTANCE: in the first version, optical fibre is formed from cladding with an essentially uniform refraction index and a three-layer core which includes a first, a second and a third core having uniform positive relative differences Δ1, Δ2 and Δ3 of refraction indices in regions from the centre to radius R1, from R1 to R2 and from R2 to R3 respectively. In the second version, optical fibre is formed from cladding with an essentially uniform refraction index and a three-layer core which includes a first, a second and a third core having maximum relative difference Δ1, minimum relative difference Δ2 and maximum relative difference Δ3 of refraction indices in regions from the centre to radius R1, from R1 to R2 and from R2 to R3 respectively. Δ1, Δ2, Δ3, R1 and R2 satisfy relationships given in the formula of invention. EFFECT: stabilisation of characteristics in the longitudinal direction, improved manufacturability and suppression of induced Brillouin scattering. 4 cl, 22 dwg, 13 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 401 444 (13) C1 (51) МПК G02B 6/036 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21), (22) Заявка: 2009113619/28, 13.09.2007 (24) Дата начала отсчета срока действия патента: 13.09.2007 (72) Автор(ы): ЙОСИДА Такеси (JP), НУНОМЕ Томохиро (JP) (45) Опубликовано: 10.10.2010 Бюл. № 28 2 4 0 1 4 4 4 (56) Список документов, цитированных в отчете о поиске: JP 2006184534 А, 13.07.2006. JP 2006232599 A, 07.09.2006. RU 2168190 C2, 27.05.2001. WO 2004100406 А2, 18.11.2004. (85) Дата перевода заявки PCT на национальную фазу: 14.04.2009 2 4 0 1 4 4 4 R U (87) Публикация PCT: WO 2008/032779 (20.03.2008) C 1 C 1 (86) Заявка PCT: JP 2007/067830 (13.09.2007) Адрес для переписки: 129090, Москва, ул.Б.Спасская, 25, стр.3, ООО "Юридическая фирма Городисский и Партнеры", А.В.Мицу (54) ОПТИЧЕСКОЕ ВОЛОКНО И ЗАГОТОВКА ОПТИЧЕСКОГО ВОЛОКНА (57) Реферат: Оптическое волокно по ...

Multi-clad optical fiber

Polymer clad optical fiber

Fibre with rare-earth element-doped core and multilayer cladding, fibre amplfier and fibre laser

Волокно содержит сердцевину, включающую в себя редкоземельный элемент, внутреннюю оболочку, окружающую сердцевину, и внешнюю оболочку, окружающую внутреннюю оболочку. Внешняя оболочка представляет собой полимерную оболочку. Внутренняя оболочка имеет многоугольное поперечное сечение, которое не обладает вращательной симметрией второго порядка, так что форма границы между внутренней оболочкой и внешней оболочкой является многоугольной и не обладает вращательной симметрией второго порядка. Разность между максимальным внешним диаметром и минимальным внешним диаметром многоугольного поперечного сечения внутренней оболочки составляет 6% или менее от среднего внешнего диаметра. Многоугольное поперечное сечение внутренней оболочки имеет 15 или менее сторон. Волокно может применяться в качестве усиливающей излучение среды в составе волоконного лазера или усилителя. Технический результат заключается в обеспечении низкого уровня спиральной моды. 3 н. и 4 з.п. ф-лы, 17 ил., 1 табл. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 421 855 (13) C2 (51) МПК H01S H01S 3/06 (2006.01) 3/067 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2009130249/28, 28.08.2008 (24) Дата начала отсчета срока действия патента: 28.08.2008 (72) Автор(ы): ТАНИГАВА Содзи (JP), ИТИИ Кентаро (JP) R U (73) Патентообладатель(и): ФУДЗИКУРА ЛТД. (JP) Приоритет(ы): (30) Конвенционный приоритет: 28.08.2007 JP 2007-220891 (43) Дата публикации заявки: 20.02.2011 Бюл. № 5 2 4 2 1 8 5 5 (45) Опубликовано: 20.06.2011 Бюл. № 17 (56) Список документов, цитированных в отчете о поиске: US 6954575 В2, 21.11.2002. JP 2007033859 А, 08.02.2007. US 2005254764 А1, 17.11.2005. RU 97103520 А, 10.04.1999. 2 4 2 1 8 5 5 R U (86) Заявка PCT: JP 2008/065422 (28.08.2008) C 2 C 2 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 06.08.2009 (87) Публикация заявки РСТ: WO 2009/028614 (05.03.2009) Адрес для переписки: 129090, Москва, ул.Б. ...

Imaging system and related techniques

A method and apparatus for imaging using a double-clad fiber is described.

A kind of hollow antiresonance optical fiber of multi-resonant layer

本发明提供一种多谐振层的空芯反谐振光纤，包括低折射率的纤芯区域和高折射率的包层区域，所述高折射率的包层区域包括内包层区和外包层区域，所述外包层区域包覆内包层区域和纤芯区域，所述内包层区域包括第一反谐振层和第二反谐振层，且所述第一反谐振层和第二反谐振层包围纤芯区域；所述第一反谐振层包括若干层微毛细管，所述第二反谐振层支撑所述第一反谐振层。采用双包层结构，通过两层及以上的反谐振层，理论仿真上损耗能降低至0.1dB/km，具有超低传输损耗、光谱带宽宽、弯曲损耗小、传输损耗低、损伤阈值高和保持单模传输的特点。

Optical fiber and optical fiber preform

An optical fiber preform has a core portion having a first core portion including a central axis, a second core portion disposed around the first core portion, and a third core portion disposed around the second core portion. The first core portion contains 10 atomic ppm or more of an alkali metal and 10 to 600 atomic ppm of chlorine, the second core portion contains 10 atomic ppm or less of the alkali metal and 10 to 600 atomic ppm of chlorine, and the third core portion contains 10 atomic ppm or less of the alkali metal and 2,000 atomic ppm or more of chlorine. An optical fiber has a core region doped with an alkali metal and chlorine, wherein the minimum concentration of chlorine in the core region is 1,000 atomic ppm or more, and the average concentration of the alkali metal therein is 0.2 atomic ppm or more.

Optic fibre with monomode core and multimode core or layer

An optical fibre (2) incorporates both a monomode core (4) and a multimode core (6) in which both cores are substantially transparent at the wavelength of light they are intended to guide. The optical fibre is intended for use in airframe or other applications in which it is impractical to replace the optical fibre and enable a single fibre to be used for both monomode or multimode communication. Interfaces 5, 7, cladding 8 and outer protective coating 10 are shown.

Improvements in or relating to optical fibres

In a graded optical fibre comprising a core 11 of transparent material having throughout its length a cladding 12 of another transparent material of a lower refractive index than that of the material of the core, the refractive index of the material of the core gradually decreases towards the outer surface of the core, and, at any transverse cross-section of the optical fibre, all refractive indices of substantially the same value lie on a contour 13 which is eccentrically positioned with respect to the central axis of the fibre. Preferably, each point on a contour 13 of refractive indices of the same value follows a helical path down the length of the fibre. The bandwidth and other transmission characteristics of an optical guide built up by connecting such graded optical fibres end-to-end can be closely controlled and predicted. <IMAGE>

Fiber optics for metropolitan and access network systems

(57)【要約】 １３１０ｎｍでの第１の動作波長と、１５５０ｎｍでの第２の動作波長の少なくとも１つを囲む波長帯域で動作する光信号送信器と、該光信号送信器の一端に接続された光送信ラインと、該光送信ラインの一端に接続された受信器と、を備え、該送信ラインが、ファイバのガラス層に配置された最大屈折率差を有する少なくとも１つのケーブルシングル・モード光ファイバを含み、該ケーブル化ファイバが、１３００ｎｍ未満のカット・オフ波長と、約５ｐｓ／ｎｍ／ｋｍと約１５ｐｓ／ｎｍ／ｋｍとの間の絶対値の正の分散と、該第１の動作波長と第２の動作波長の他方で約５ｐｓ／ｎｍ／ｋｍと約１５ｐｓ／ｎｍ／ｋｍの間の絶対値の負の分散と、該第１の動作波長と第２の動作波長の間の波長での零分散と、約６０μｍ 2 より大きい１５５０ｎｍ付近の波長での有効エリアとを含む、ことを特徴とする高速大都市圏またはアクセス光通信システム。

Optical fiber and optical fiber preform

An optical fiber containing an alkali metal element and exhibiting low attenuation as well as excellent radiation resistance is provided. The optical fiber of the present invention has a core region and a cladding region enclosing the core region. The core region contains alkali metal elements by an average concentration of 0.2 atomic ppm or more. The attenuation at a wavelength of 1550 nm after irradiating with the radiation of 0.10 Gy or more of cumulative absorbed dose increases by 0.02 dB/km or less as compared with the attenuation exhibited prior to radiation exposure.

Ensheathed optical fiber and coupling method

A single-mode optical fiber transmission line suited for coupling to another fiber through a laterally coupled splice includes a core having a selected diameter, a cladding layer that surrounds the core and has a cladding thickness between one and two core diameters, and an auxiliary cladding into which the optical fiber is nested. The auxiliary cladding has an index of refraction not substantially greater than that of the cladding layer that surrounds the core, an inside dimension greater than that of the outside dimension of the optical fiber, at least partially surrounds the optical fiber and is attached to the optical fiber at least along one lineal connection zone. An optical fiber in accordance with the present invention may be spliced by freeing the optical fiber from the auxiliary cladding by, for example, dissolving the lineal connection zone with dilute hydrofluoric acid, fracturing and removing the auxiliary cladding from the freed cladding and core structure and effecting a lateral coupling splice with a similarly prepared optical fiber.

Optical fiber, method for manufacturing same and optical transmission channel

The present invention provides an optical fiber of which a zero dispersion wavelength falls within a range of between 1,250 nm and 1,350 nm inclusive, transmission loss at 1,550 nm is equal to or less than 0.185 dB/km, chromatic dispersion at 1,550 nm is within the range of 19±1 ps/nm·km, a dispersion slope at 1,550 nm is equal to or less than 0.06 ps/nm 2 ·km, an effective area A eff is equal to or more than 105 μm 2 , a cable cutoff wavelength λ cc is equal to or less than 1,530 nm, polarization mode dispersion is equal to or less than 0.1 ps/km 1/2 , and a loss when the optical fiber is wound on a mandrel having an outer diameter of 20 mm is equal to or less than 10 dB/m.

Distributed resonant ring fiber filter

Disclosed is a fiber optic filter that includes a central core (19), a ring core (20) concentric with the central core (19), an inner cladding region (2 1) of refractive index ni, and a cladding layer (22) of refractive index nc surrounding the ring core (20). The maximum refractive index n1 of the centr al core (19) and the maximum refractive index n2 of the ring core (20), are greater than nc and n1. At least at one wavelengths, power transfers between the two cores at (19 and 20). At least a portion of the filter (10) is wound around a reel (18) which determines the attenuation.

Optical fiber, optical fiber cladding power filter, optical fiber laser and optical fiber preparation method

本申请公开了光纤、光纤包层功率滤除器、光纤激光器及光纤制备方法，其中该光纤包括纤芯和内包层，内包层具有第一折射率，内包层用于反射传输泵浦光，纤芯用于传输激光且吸收泵浦光，其中内包层内形成有滤除窗，滤除窗具有第二折射率，第一折射率与第二折射率相异，滤除窗用于将内包层内残留的泵浦光从内包层沿滤除窗折射导出。上述方式能够降低残留的泵浦光对光纤可靠性和稳定性的影响，并且不需要对内包层结构进行打孔、腐蚀等破坏性操作，能够确保内包层结构完整性，进而能够确保光纤的强度。

Optical fibres

Single mode optical fibre

A low attenuation single mode optical fibre used in an optical fibre communication system, including a core layer and claddings. The relative refractive index difference of the core layer △1 ranges from - 0.1% to + 0.1% and the radius R1 thereof ranges from 4.0 μm to 6.0 μm. There are three claddings surrounding the core layer. The relative refractive index difference of the first cladding △2 ranges from - 0.2% to - 0.6%, and the radius R2 thereof ranges from 10 μm to 22 μm. The relative refractive index difference of the second cladding △3 is less than △2. The relative refractive index difference and radius of the first cladding and the relative refractive index difference and radius of the second cladding are related by the following numerical relation: V = (△2 - △3) × ( R3 - R2), and the value of V ranges from 0.15% μm to 0.8% μm. The third cladding is all the layers that closely surround the second cladding, and the relative refractive index difference of each layer is greater than △3. The refractive index profile of the low attenuation single mode optical fibre is designed rationally and the anti-bending performance of the optical fibre is further improved.

Dual-band bend tolerance optical waveguide

본 발명은 굴절 지수 n co 및 반경 r co 를 가지는 코어; 코어를 측방향으로 둘러싸면서, 굴절 지수 n ic 및 r ic 의 외부 반경을 가지는 내부 클래딩; 내부 클래딩을 측방향으로 둘러싸면서, 굴절 지수 n oc 를 가지는 외부 클래딩; 및 좁은 디프레스드 웰을 포함하며 n co >n oc >n ic 인 광 도파체에 관련한다. 코어 반경(r co )에 대한 내부, 디프레스드-웰 클래드 반경(r ic )의 비율의 범위는 2.4로부터 3.0까지 변하며, +Δ는 0.0014 내지 0.0021, -Δ는 -0.0021 내지 -0.0034, 및 Δ Tot 는 0.0043 내지 0.0049이다. The present invention provides a core having a refractive index n co and a radius r co ; An inner cladding having an outer radius of refractive indexes n ic and r ic , while laterally surrounding the core; An outer cladding having an index of refraction n oc , while laterally surrounding the inner cladding; And narrow depressed wells and relates to optical waveguides where n co > n oc > n ic . The range of the ratio of the inner, depressed-well clad radius r ic to the core radius r co varies from 2.4 to 3.0, with + Δ being 0.0014 to 0.0021, -Δ being -0.0021 to -0.0034, and Δ Tot Is 0.0043 to 0.0049. 광 도파체, 굴절 지수, 내부 클래딩, 외부 클래딩, 코어 Optical waveguide, refractive index, inner cladding, outer cladding, core

Multimode waveguide configured to generate single-mode radiation from single-mode radiation

本发明涉及一种被配置成从单模辐射生成单模辐射的多模波导。波导(1)具有折射率分布，该折射率分布包括至少一个最大值，折射率分布的一个或多个最大值分别对应于具有期望阶模的出口辐射(11)强度的至少一个最大值，波导(1)还具有至少一种掺杂离子，至少一种掺杂离子被配置成吸收泵浦辐射(31)，一种或多种掺杂离子具有掺杂离子的浓度分布，掺杂离子的浓度分布包括至少一个最大值。

Optical fiber

Optical fiber for metropolitan and access network systems

An optical transmission fiber for use in a metropolitan or access network is disclosed. The transmission line includes a fiber being single mode at a first operating wavelength of around 1310 nm and a second operating wavelength of around 1550 nm. The dispersion of the fiber is negative at one of the first and second operating wavelengths and positive at the other of the first and second operating wavelengths, with an absolute value of between about 5 ps/nm/km and 15 ps/nm/km. The fiber also has a zero dispersion wavelength that is located between the first and second operating wavelengths, and an effective area at a wavelength around 1550 nm greater than about 60 µm2. The cabled fiber has a cutoff wavelength less than about 1300 nm. The fiber allows wavelength division multiplexing (WDM) operation in both the bands (1310 nm and 1550 nm) by reducing nonlinear effects such as four-wave mixing (FWM).

Optical fiber

本发明公开了一种光纤，其中包层的折射率沿径向向外增加。在特定的实例中，包层的折射率从一个低值单调增加到一个接近或高于纤芯中折射率。这种光纤能以有效的单模方式工作或以有效的多模方式工作，且这种光纤非常适用于高比特率通信系统中。

Optical fiber

本发明公开了一种光纤，其中包层的折射率沿径向向外增加。在特定的实例中，包层的折射率从一个低值单调增加到一个接近或高于纤芯中折射率。这种光纤能以有效的单模方式工作或以有效的多模方式工作，且这种光纤非常适用于高比特率通信系统中。

Optical fiber with increased Brillouin threshold, transmission system and multiple-wavelength transmission system

An optical fiber has a first mode field diameter in a dominant mode of an acoustic mode generated in the optical fiber different from a second mode field diameter in a light intensity distribution of the optical fiber to increase the SBS threshold by reducing the overlap between the two modes. Furthermore, a transmission system is configured to perform an analog signal transmission, a baseband transmission, or an optical SCM transmission by use of the optical fiber.

Mode mixing optical fibers and methods and systems using the same

The present disclosure relates more to mode mixing optical fibers useful, for example in providing optical fiber laser outputs having a desired beam product parameter and beam profile. In one aspect, the disclosure provides a mode mixing optical fiber for delivering optical radiation having a wavelength, the mode mixing optical fiber having an input end, an output end, a centerline and a refractive index profile, the mode mixing optical fiber comprising: an innermost core, the innermost core having a refractive index profile; and a cladding disposed about the innermost core, wherein the mode mixing optical fiber has at least five modes at the wavelength, and wherein the mode mixing optical fiber is configured to distribute a fraction of the light input at its input end from its lower-order modes to its higher-order modes.

Single-mode fiber with larger effective area

本发明涉及一种具有较大有效面积的单模光纤，包括纤芯层和外包层，其特征在于纤芯层外包覆中间包层，中间包层外设置有下陷包层；所述的纤芯层分为第一纤芯分层及第二纤芯分层，所述的第一纤芯分层半径r 1 为1.5μm~5μm，相对折射率差 为0.05%~0.22%，所述的第二纤芯分层半径单边径向宽度（r 2 -r 1 ）为1.5μm~5μm，相对折射率差 为0.15%~0.34%，且第一纤芯分层的相对折射差 小于第二纤芯分层相对折射率差 。本发明通过光纤折射率剖面的合理设计，获得更大的有效面积，并在在截止波长和弯曲性能等方面取得较好的折中。所制备的光纤在较佳参数范围下，可以达到等于或大于120μm 2 的有效面积。本发明的光纤可适用于高速、大容量的长距离传输系统以及长距离无中继传输系统。

Optical fiber draw assembly and fabricated optical fiber thereof

The present disclosure provides an optical fiber draw assembly (100). The optical fiber draw assembly (100) includes a central core rod (102). The central core rod (102) includes a core region (103) longitudinally extending in a vertical direction. The central core rod (102) further includes a first cladding region (105). The optical fiber draw assembly (100) further includes a fluorine-doped tube (104) longitudinally extending from a first end (114) to a second end (116) in the vertical direction. The optical fiber draw assembly (100) further includes a hollow clad cylinder (106). The core rod assembly (118) is sheathed inside the hollow clad cylinder (106). The central core rod (102) and the fluorine-doped tube (104) collectively form the core rod assembly (118). The geometrical center of the core rod assembly (118) and the geometrical center of the hollow clad cylinder (106) coincide.

Optical fiber for metropolitan and access network systems

An optical transmission fiber for use in a metropolitan or access network is disclosed. The transmission line includes a fiber being single mode at a first operating wavelength of around 1310 nm and a second operating wavelength of around 1550 nm. The dispersion of the fiber is negative at one of the first and second wavelengths and positive at the other wavelength, with an absolute value of between about 5 and 15 ps/nm/km. The fiber also has a zero dispersion wavelength that is located between the first and second operating wavelengths, and an effective area at a wavelength around 1550 nm greater than about 60 μm 2 . The cabled fiber has a cutoff wavelength less than about 1300 nm. The fiber allows wavelength division multiplexing (WDM) operation in both the bands (1310 nm and 1550 nm) by reducing nonlinear effects such as four-wave mixing (FWM).

High-mode-number and weak-coupling few-mode optical fiber

本申请涉及一种高模式数量且弱耦合的少模光纤，其包括由内到外依次设置的椭圆芯层、椭圆环形芯层、椭圆环形下陷包层和外包层；在所述椭圆环形下陷包层上设有两个空气孔，两个所述空气孔关于所述椭圆环形芯层的短轴轴对称；在所述椭圆芯层、椭圆环形芯层和椭圆环形下陷包层中，三者的中心大致重合，三者的长轴位于同一直线上，三者的短轴位于同一直线上；所述椭圆芯层与所述椭圆环形芯层的折射率剖面的形状均为水平直线形；所述椭圆芯层的折射率小于所述椭圆环形芯层的折射率。本申请能够解决相关技术中光纤可用的模式数量较少，远不能满足长距离大容量扩容的需求的问题。

Injection device for optical fibre and preparation method

The invention concerns an injection device for optical fibre characterised in that it comprises a main fibre ( 100 ), and an auxiliary fibre ( 200 ) whereof the beveled end ( 210 ) is placed on the edge of the main fibre ( 10 ), wherein the auxiliary fibre ( 200 ) has a numerical aperture smaller than the numerical aperture of the main fibre ( 100 ). The invention also concerns a method for preparing the device.

Dual-band bending-resistant optical waveguide

Injection device for optical fibre and preparation method

The invention concerns an injection device for optical fibre characterised in that it comprises a main fibre (100), and an auxiliary fibre (200) whereof the bevelled end (210) is placed on the edge of the main fibre (100), wherein the auxiliary fibre (200) has a numerical aperture smaller than the numerical aperture of the main fibre (100). The invention also concerns a method for preparing said device.

Method of producing optical fiber, and fiber produced by the method

A multimode optical fiber

Optical fiber assembly with beam shaping component

An optical fiber assembly is provided including an optical fiber and a beam shaping component affixed to an extremity of the optical fiber. The optical fiber supports a guided mode having a spatial profile defining a first shape. The beam shaping component defines a light path and has a transversal refractive index profile including an outer refractive index value greater than an inner refractive index value. The beam shaping component transforms the spatial profile of a light beam propagating along the light path between the first shape and a second shape different from the first shape. The optical assembly may for example transform a Gaussian light beam into a flat-top or donut shape.

Hollow anti-resonance optical fiber with multiple resonance layers

一种多谐振层的空芯反谐振光纤，包括低折射率的纤芯区域(1)和高折射率的包层区域，高折射率的包层区域包括内包层区域(4)和外包层区域(5)，外包层区域(5)包覆内包层区域(4)和纤芯区域(1)。内包层区域(4)包括第一反谐振层(2)和第二反谐振层(3)，且第一反谐振层(2)和第二反谐振层(3)包围纤芯区域(1)；第一反谐振层(2)包括若干层微毛细管，第二反谐振层(3)支撑第一反谐振层(2)。采用双包层结构，通过两层及以上的反谐振层，理论仿真上损耗能降低至0.1dB/km，具有超低传输损耗、光谱带宽宽、弯曲损耗小、传输损耗低、损伤阈值高和保持单模传输的特点。

Partially detached core optical waveguide.

Fiber for optical transmission

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Bend Insensitive Optical Fibers with Low Refractive Index Glass Rings

An optical fiber includes a silica-based glass portion having an outer diameter of less than about 120 μm. The glass portion comprises a core, an inner cladding and a low index ring. The core comprises an index of refraction n 1 , and a relative refractive index percent Δ 1 % relative to pure silica glass. The inner cladding surrounds the core and comprises an index of refraction n 2 , a radial thickness of less than about 40 μm and a relative refractive index percent Δ 2 % relative to pure silica glass, wherein Δ 1 %>Δ 2 % and the difference between Δ 1 % and Δ 2 % is greater than 0.1%. The low index ring surrounds the inner cladding and comprises boron and fluorine, a radial thickness of less than about 20 μm, an index of refraction n 3 and a third relative refractive index percent Δ 3 % relative to pure silica glass, wherein Δ 2 %>Δ 3 % and Δ 3 % is less than −0.5%.

Article having optical fiber of silica base

(57)【要約】 【課題】 ポンプ放射を光ファイバに容易に結合できる ような構造体を有するクラッド層ポンプ光ファイバを提 供すること。 【解決手段】 コア（１１）と、このコアを包囲する内 側クラッド層（１２）を有するシリカベースの光ファイ バ（１０）を有する物品において、内側クラッド層の屈 折率ｎi は、コアの屈折率ｎc 以下であり、この内側ク ラッド層は、外側クラッド層により包囲され、外側クラ ッド層は、内側クラッド層と第２の外側クラッド層（１ ４）との間に、第１外側クラッド層（１３）を有し、こ れらのコアと内側クラッド層と第１外側クラッド層と第 ２外側クラッド層とはプリフォームから得られたガラス 製であり、第１外側クラッド層は、この第１外側クラッ ド層の屈折率ｎ01は１．３５以下であり、第１外側クラ ッド層は、その光ファイバの光学特性が第２外側クラッ ド層から独立していることを特徴とする。

A kind of high damage threshold hollow microstructured optical fibers

本发明涉及一种可传输高能量高功率的脉冲激光的高损伤阈值空芯微结构光纤。沿所述外包层石英玻璃管的内壁一圈，间隙排列有11至15根石英微毛细管构成内包层，11至15根石英微毛细管与石英玻璃管内壁的接触部分，以熔接方式固定在石英玻璃管的内壁上，11至15根石英微毛细管的中间部分，即最内层为低折射率纤芯区域，低折射率纤芯区域为惰性气体或空气或真空。本发明的有益效果是：内包层为11至15根相互不接触的石英玻璃微毛细管即空芯微结构光纤构成，这种结构利用反谐振导引原理使光在空芯纤芯中传输，使传输的光能量大部分存在于低折射率纤芯，从而提高了光纤的损伤阈值，可为高能量高功率的激光传输奠定基础。

Metropolitan communication system or high-speed optical access, unimodal optical transmission fiber and optical transmission method by wavelength division multiplexing

"SISTEMA DE COMUNICAçãO METROPOLITANO OU DEACESSO óPTICO DE ALTA VELOCIDADE, FIBRA DETRANSMISSãO óPTICA UNIMODAL E MéTODO DETRANSMISSãO óPTICA POR MULTIPLEXAçãO POR DIVISãODE COMPRIMENTO DE ONDA". Uma fibra de transmissão ópticapara uso em uma rede metropolitana ou de acesso é apresentada.A linha de transmissão inclui uma fibra sendo unimodal a umprimeiro comprimento de onda operacional de cerca de 1310 nm eum segundo comprimento de onda operacional de cerca de 1550nm. A dispersão da fibra é negativa em um dos primeiro e segundocomprimentos de onda operacional e positiva no outro dos primeiroe segundo comprimentos de onda operacionais, com um valorabsoluto de entre cerca de 5 ps/nm/km e 15 os/nm/km. A fibratambém tem um comprimento de onda de dispersão zero que estálocalizado entre os primeiro e segundo comprimentos de ondaoperacional, e uma área efetiva a um comprimento de onda emtorno de 1550 nm maior que cerca de 60 <109>m^ 2^. A fibracabeada tem um comprimento de onda de corte inferior a cerca de1300 mn. A fibra permite operação de multiplexação por divisão porcomprimento de onda (WDM) em ambas as bandas (1310 nm e1550 nm) reduzindo efeitos não lineares tal como mixagem dequatro ondas (FWM).

Articles having silica-based optical fibers

Multi-clad optical fiber

描述了一种多包层光纤设计，以便在光谱的UV可见光部分中为基本传播模式线性偏振(LP)01模式提供低光损耗、高数值孔径(NA)和高光学增益。光纤设计可以包含掺杂剂，以便同时增加纤芯区域的光学增益，同时避免在光纤制造过程中产生额外的损耗。光纤设计可以掺入稀土掺杂剂以有效地发射激光。另外，光学纤芯中传播模式的模态特性促进高效的非线性混合，从而提供高光束质量(M 2 <1.5)的发射光输出。

Optical fiber structure for efficient use of pump power

본 발명은 활성 게인 원소들로 선택적으로 도핑된 하나 이상의 코어 (134), 및 그 코어를 감싸고 있는 내부 클래딩 (clading) 을 포함하는, 게인 (gain) 응용에 사용하기 위한 광섬유 (130) 구조물로서, 여기서, 그 내부 클래딩은, 펌프 에너지가 섬유 구조체의 길이를 따라 진행함에 따라, 외부 전원으로부터의 다중모드 펌프에너지를 받아들여, 이 에너지를 수용하고, 그 에너지와 코어내의 활성 도판트의 상호작용에 의해, 그 에너지를 코어에 전달할 목적으로 제공된다. 내부 클래딩의 단면 형태는 펌프에너지로 이루어진 여러 가지 방사모드들이 등방적으로 분포되는 균일한 방사선 장 (radiation field) 이 유도되도록 전파하는 펌프 에너지를 포함하기 위해 직사각형이 아닌, 볼록한 다각형이다. The present invention provides an optical fiber 130 structure for use in a gain application comprising at least one core 134 selectively doped with active gain elements, and an inner cladding surrounding the core. Here, the internal cladding accepts multimode pump energy from an external power source, receives this energy as the pump energy progresses along the length of the fibrous structure, and interacts with the energy and the active dopant in the core. Thereby providing the energy to the core. The cross-sectional shape of the inner cladding is a convex polygon, not a rectangle, to contain the pump energy propagating to induce a uniform radiation field in which the various radiation modes of the pump energy are isotropically distributed.

Optical fiber, and method of manufacturing and of operating

The invention concerns an optical fiber (1) for radiation generation, concentration and transfer. The optical fiber comprises at least one luminescence generating zone of a first material comprising a luminescence generating material for providing an emitting radiation predominantly at a visible and/or near-infrared wavelength. The optical fiber further comprises at least one wave guiding zone. The at least one wave guiding zone is configured to concentrate the emitted radiation predominantly within the wave guiding zone. This provides distinct locations with different functionality, one location for generating the emitted radiation and the further location for guiding and concentrating of the emitted radiation. Thus, both zones can be specifically designed to provide optimized performance and efficiency.

Optical fiber-type optical element, laser diode module, and fiber laser

具有：沿入射的光的波导方向延伸的芯部（1）；感光层（3a），沿波导方向延伸并环绕芯部（1）的周围，通过规定波长的紫外线的照射而形成光栅（4a），在芯部（1）和感光层（3a）之间，设置有折射率比芯部（1）低、且通过规定波长的紫外线的照射使折射率变化的光敏性比感光层（3a）低的第一包层部（2）。

一种耐辐照单模光纤

本申请涉及一种耐辐照单模光纤，其包括由内到外依次布置的芯层、匹配包层、下陷包层、内包层和外包层；所述芯层采用掺氟渐变石英玻璃；所述匹配包层采用掺氟石英玻璃；所述下陷包层采用硼氟共掺石英玻璃；所述内包层采用掺氟石英玻璃。本申请具有较强的耐辐照性能。

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Multi-clad optical fiber

A multi-clad optical fiber design is described in order to provide low optical loss, a high numerical aperture (NA), and high optical gain for the fundamental propagating mode, the linearly polarized (LP) 01 mode in the UV and visible portion of the optical spectrum. The optical fiber design may contain dopants in order to simultaneously increase the optical gain in the core region while avoiding additional losses during the fiber fabrication process. The optical fiber design may incorporate rare-earth dopants for efficient lasing. Additionally, the modal characteristics of the propagating modes in the optical core promote highly efficient nonlinear mixing, providing for a high beam quality (M2 < 1.5) output of the emitted light.

一种高精度匀化光纤及其制备方法

本发明涉及一种高精度匀化光纤及制备方法，具体涉及一种双芯光纤，其包括第一纤芯(1)、第二纤芯(2)、第一包层(3)、第二包层(4)及外涂层(5)。所述的第一纤芯中心点与第二纤芯的中心点不重合，第一纤芯在第二纤芯内部，第一包层包覆在第二纤芯外部，第二包层包覆在第一包层外部。第一纤芯为圆形或方形截面，第二纤芯为圆形截面，由于将纤芯设计为双芯结构，有效扰乱光斑模式，有利于将激光能量均匀的分布于整个截面，此方法简单，纤芯无需进行异性加工，纤芯与包层之间可最大限度进行粘度匹配，降低光纤拉丝过程中缺陷的产生，有利于控制模式传输及大规模生产，获得灵活调控的模式分布。

Hollow core optical waveguiding enabled by zero-index materials

Hollow core optical waveguiding enabled by zero-index materials are provided. In one embodiments, a zero-index optical fiber is provided, the zero-index optical fiber comprising: a core comprising air for propagating light; and a cladding configured to surround the core, wherein the cladding comprises a zero-index material. The zero-index material including transparent conducting oxides such as indium tin oxide.

用于光束成形的光学纤维结构和方法

在各种实施例中，光纤具有纤芯、环形纤芯和包层区域的布置，实现改变光束形状和/或光束参数乘积，并且可以用于各种工件的加工(例如，焊接、切割、钻孔等)。