Crystallization method of lithium-aluminium-silicon system low-expansion glass-ceramics

Optical fiber coating feed system with return prevention function

Extending device and method of optical fiber mother material

The invention relates to extending device and method of an optical fiber mother material. A mother material ingot is extended into a mother material bar with smaller diameter, and the flexibility of the extended optical fiber mother material bar is reduced. The extending device comprises an extension delivering mechanism part, an extension heating furnace, an extension leading and taking mechanism part and a measurement control part, wherein the extension delivering mechanism part is installed on the extension heating furnace, the extension leading and taking mechanism part is installed under the extension heating furnace, and the measurement control part is installed at the lower part of the extension heating furnace; the extension delivering mechanism part comprises a servo motor I, a drive screw rod I, a screw rod nut I, an X-Y control unit I and a suspending chuck; the extension heating furnace is heated in an induction heating or resistance heating way; the extension leading and taking ...

Low-expansion glass-ceramics moulding method for lithium-aluminum-silicon system

The invention relates to a forming method for lithium-aluminum-silicon system low expansion microcrystalline glass. The process comprises the following steps: A, spreading upper paint on a working surface of a forming die comprising a lower die and a compression upper die, and drying the working surface of the forming die for standby; B, cutting microcrystalline sheet glass produced through a calendering method into pieces, and putting the microcrystalline sheet glass pieces into the lower die; C, preheating the compression upper die on a fire hole to more than or equal to 400 DEG C; D, picking the lower die containing the microcrystalline sheet glass into an electric furnace for preheating; E, picking the compression upper die into the furnace and placing the compression upper die above the microcrystalline sheet glass; and F, closing a furnace door, increasing, keeping and decreasing the temperature according to a temperature time curve, and after the softening and crystallization forming ...

System and method for automatically measuring optical fiber preform

The invention relates to the technical improvement of optical fiber preforms production, in particluar to a system and a method for automatically measuring an optical fiber preform. The system consists of an automatic rod-pushing device, an automatic matched oil charging and discharging device and an preform tester, wherein the automatic rod-pushing device comprises a testboard, a carriage, a servo motor and a pushing arm, a guide rail is arranged on the testboard, the carriage and the tester are fixed on the guide rail, the carriage can slide along the guide rail, the upper part of the testboard is provided with a pushing arm track through a support, the servo motor is arranged in the pushing arm track and is connected with the pushing arm which is hinged with a push rod, the push rod is provided with a push rod head which moves forward and props against one end of the preform, the carriage is provided with a rolling shaft arranged on a central shaft, and the central shaft is fixed at ...

Method for preparing single-film optical fiber for high-strength large-coil long submarine optical cable

The invention provides a method for preparing single-film optical fiber for high-strength large-coil long submarine optical cable, which relates to preparation of a single-film optical fiber for a fiber submarine optical cable, in particular to a method for preparing a high-strength large-coil long single-film optical cable. The method is characterized by comprising the following steps: (1) preprocessing of the surface of a preformed rod for preprocessing the preformed rod to be processed: firstly, cleaning the surface of the preformed rod; and secondly, performing flame polishing on the preformed rod to polish away 10 to 100 mu m of silicon dioxide from the surface of the preformed rod, and closing up microcracks on the surface of the preformed rod; (2) upper-tower fiber drawing for mounting the preformed rod on a fiber drawing furnace: after bared fiber comes out of the furnace, coating the bared fiber by an ultraviolet curing coating, performing curing by an ultraviolet curing device ...

Production method of ultralow-polarization dispersive single-mode fiber

The invention discloses an ultra-low polarization mode dispersion single mode fiber production method, which relates to a production method for effectively reducing the polarization mode dispersion of the single mode fiber to ensure the single mode fiber to be suitable for optical fiber communication system with high speed, large capacity and long distance. The method comprises the steps that firstly, a rod is installed on a tower to start wire drawing; secondly, naked fiber is cooled; thirdly, the fiber is coated; fifth, taking up, compounding and testing performed to the fiber. A sinusoidalfiber twisting device is inducted between a main traction structure and a double taking up structure, to perform periodic sinusoidal twisting to the fiber, therefore the fiber polarization mode dispersion (PMD) value is effectively reduced, the process influence on the wire drawing perpendicular direction is avoided, more stable and reliable control effect is played to the production of the fiberwire ...

Silicon tetrachloride feeding pressurization system and pressurization method thereof

The invention discloses a silicon tetrachloride feeding pressurization system and a pressurization method thereof, which relate to the pressurization of feeding silicon tetrachloride in the production of an optical-fibre perform, in particular to a method for realizing long-distance feeding by adding a set of pressurization system. The pressurization system comprises two silicon tetrachloride pressurization tanks, a nitrogen pressurizing tank, two weight electronic weighers, a plurality of solenoid valves and a plurality of PLCs (programmable logic controllers), wherein a weight electronic weigher is arranged on the lower parts of the two silicon tetrachloride pressurization tanks respectively, or a liquid level meter is arranged in both the two silicon tetrachloride pressurization tanks;and a nitrogen pipeline, a feeding pipeline and a discharging pipeline are arranged on the upper parts of the two silicon tetrachloride pressurization tanks respectively. The silicon tetrachloride ina silicon ...

Silicon tetrachloride feeding pressurization system and pressurization method thereof

The invention discloses a silicon tetrachloride feeding pressurization system and a pressurization method thereof, which relate to the pressurization of feeding silicon tetrachloride in the production of an optical-fibre perform, in particular to a method for realizing long-distance feeding by adding a set of pressurization system. The pressurization system comprises two silicon tetrachloride pressurization tanks, a nitrogen pressurizing tank, two weight electronic weighers, a plurality of solenoid valves and a plurality of PLCs (programmable logic controllers), wherein a weight electronic weigher is arranged on the lower parts of the two silicon tetrachloride pressurization tanks respectively, or a liquid level meter is arranged in both the two silicon tetrachloride pressurization tanks; and a nitrogen pipeline, a feeding pipeline and a discharging pipeline are arranged on the upper parts of the two silicon tetrachloride pressurization tanks respectively. The silicon tetrachloride in a ...

Production method of ultralow-polarization dispersive single-mode fiber

The invention discloses an ultra-low polarization mode dispersion single mode fiber production method, which relates to a production method for effectively reducing the polarization mode dispersion of the single mode fiber to ensure the single mode fiber to be suitable for optical fiber communication system with high speed, large capacity and long distance. The method comprises the steps that firstly, a rod is installed on a tower to start wire drawing; secondly, naked fiber is cooled; thirdly, the fiber is coated; fifth, taking up, compounding and testing performed to the fiber. A sinusoidal fiber twisting device is inducted between a main traction structure and a double taking up structure, to perform periodic sinusoidal twisting to the fiber, therefore the fiber polarization mode dispersion (PMD) value is effectively reduced, the process influence on the wire drawing perpendicular direction is avoided, more stable and reliable control effect is played to the production of the fiber wire ...

Method for preparing single-film optical fiber for high-strength large-coil long submarine optical cable

The invention provides a method for preparing single-film optical fiber for high-strength large-coil long submarine optical cable, which relates to preparation of a single-film optical fiber for a fiber submarine optical cable, in particular to a method for preparing a high-strength large-coil long single-film optical cable. The method is characterized by comprising the following steps: (1) preprocessing of the surface of a preformed rod for preprocessing the preformed rod to be processed: firstly, cleaning the surface of the preformed rod; and secondly, performing flame polishing on the preformed rod to polish away 10 to 100 mu m of silicon dioxide from the surface of the preformed rod, and closing up microcracks on the surface of the preformed rod; (2) upper-tower fiber drawing for mounting the preformed rod on a fiber drawing furnace: after bared fiber comes out of the furnace, coating the bared fiber by an ultraviolet curing coating, performing curing by an ultraviolet curing device ...

Low-expansion glass-ceramics moulding method for lithium-aluminum-silicon system

The invention relates to a forming method for lithium-aluminum-silicon system low expansion microcrystalline glass. The process comprises the following steps: A, spreading upper paint on a working surface of a forming die comprising a lower die and a compression upper die, and drying the working surface of the forming die for standby; B, cutting microcrystalline sheet glass produced through a calendering method into pieces, and putting the microcrystalline sheet glass pieces into the lower die; C, preheating the compression upper die on a fire hole to more than or equal to 400 DEG C; D, picking the lower die containing the microcrystalline sheet glass into an electric furnace for preheating; E, picking the compression upper die into the furnace and placing the compression upper die above the microcrystalline sheet glass; and F, closing a furnace door, increasing, keeping and decreasing the temperature according to a temperature time curve, and after the softening and crystallization forming ...

Method for preparing a microgap sleeve optical fiber prefabrication bar and method for drawing and preparing an optical fiber by microgap sleeve optical fiber prefabrication bar

The invention discloses a method for preparing a microgap sleeve optical fiber prefabrication bar and a method for drawing and preparing an optical fiber by the microgap sleeve optical fiber prefabrication bar and relates to the production of an optical fiber prefabrication bar and a method for drawing the wire by the optical fiber prefabrication bar. The method for preparing the microgap sleeve optical fiber prefabrication bar comprises the following steps: 1) a joint handle adopts a glass lathe and uses oxyhydrogen flame for separately abutting a core bar, a handle bar, a sleeve and a tail handle end face after high-temperature melting; 2) the joint handle is cleaned and dried, and 2-3 percent of hydrofluoric acid is used for cleaning the surfaces of the core bar and the sleeve for 2 hours so as to remove pollutants on the surfaces; and 3) in the assembly process, the cleaned and dried core bar is assembled into the sleeve, and then quartz sand is filled between the sleeve and the core ...

Ultralow-expansion coefficient high transparent microcrystalline glass and method for producing its product

The present invention relates to a Li₂O-Al₂O₃-SiO₂ system ultra-low expansion coefficient high-transparency glass-ceramic and production method of the products. Calculated by weight percentage, the ultra-low expansion coefficient high-transparency glass-ceramic is composed of 3.2 to 4.6 percent of Li₂O, 18.0 to 23.6 percent of Al₂O₃, 64.1 to 69.4 percent of SiO₂, 0.3 to 0.8 percent of MgO, 0.8 to 2.5 percent of BaO, 0.3 to 0.8 percent of R₂O, 0.01 to 0.4 percent of Y₂O₃, 1.8 to 2.5 percent of TiO₂, 1.6 to 2.4 percent of ZrO₂, 1.1 to 1.8 percent of P₂O₅, 0.6 to 1.5 percent of Sb₂O₃, 0.3 to 1.0 percent of NaCl and 1.0 to 2.0 percent of NH₄NO₃. The heat-resistant glass plates and heat-resistant glass products can be manufactured by using the formula and the corresponding forming die.

Method for preparing a microgap sleeve optical fiber prefabrication bar and method for drawing and preparing an optical fiber by microgap sleeve optical fiber prefabrication bar

The present invention discloses a method for preparing a microgap sleeve optical fiber prefabrication bar and a method for drawing and preparing an optical fiber by the microgap sleeve optical fiber prefabrication bar and relates to the production of an optical fiber prefabrication bar and a method for drawing the wire by the optical fiber prefabrication bar. The method for preparing the microgap sleeve optical fiber prefabrication bar comprises the following steps: 1) a joint handle adopts a glass lathe and uses oxyhydrogen flame for separately abutting a core bar, a handle bar, a sleeve and a tail handle end face after high-temperature melting; 2) the joint handle is cleaned and dried, and 2-3 percent of hydrofluoric acid is used for cleaning the surfaces of the core bar and the sleeve for 2 hours so as to remove pollutants on the surfaces; and 3) in the assembly process, the cleaned and dried core bar is assembled into the sleeve, and then quartz sand is filled between the sleeve and ...

Equipment for loose body optical fiber prefabricated rod integral sintering desaeration and method thereof

The invention provides equipment for loose body optical fiber prefabricated rod integral sintering desaeration and a method thereof, which relate to a manufacture method of a single mold optical fiber prefabricated rod, in particular to equipment and method thereof for simultaneously carrying out vitrification and desaeration of the loose body optical fiber prefabricated rod. The equipment comprises a rod conveying device, a vacuum pump, a waste gas discharge stop valve, a quartz furnace core pipe cover plate, a graphite resistance furnace or an induction furnace, a carbon furnace core pipe, a quartz furnace core pipe, a pressure meter and a furnace inside gas inlet stop valve, wherein the quartz furnace core pipe is arranged in the carbon furnace core pipe, the middle part of the quartz furnace core pipe is provided with a sintering furnace, the upper part of the quartz furnace core pipe and the upper part of the carbon furnace core pipe are provided with the quartz furnace core pipecover ...

Bending insensitive low water peak single mode fibre and manufacture method thereof

The invention provides a bend insensitive low water peak single-mode fiber and a method for preparing the same, which relates to a single-mode fiber for a fiber to the home (FTTH), in particular to the bend insensitive low water peak single-mode fiber and the method for preparing the same. The structure of the bend insensitive low water peak single-mode fiber comprises a fiber core, an inner cladding, an outer cladding and two ultraviolet curing coating layers, wherein the inner cladding and the outer cladding are covered outside the fiber core; the two ultraviolet curing coating layers are covered outside the outer cladding. The method for preparing the bend insensitive low water peak single-mode fiber comprises the following steps of: type selection of a preform rod; surface cleaning of a core rod and corrosion control; assembly with a tower and fiber drawing; parameter verification of fiber performance; the single-mode fiber prepared through the method can meet an evenness requirement ...

Production method of high-bandwidth multi-mode fiber

The invention relates to a production method of high bandwidth multimode fiber, in particular to a production method of the high bandwidth multimode fiber. The method is based on the research of ten gigabit multimode fiber and designed by special process, which leads the frequency response curve to be relatively flat in a plurality of main frequency bands of wireless communication; the method is mainly used in a fiber-bearing radio wave system so as to meet the needs of fiber users. The production includes: washing, drying and assembling of a mandrel and a sleeve of the high bandwidth multimode fiber, drawing technology, argon-helium gas mixture in a drawing furnace, sinusoidal rubbing of the fiber, double wrapping and filtering of semi-finished products of high bandwidth multimode fiber, performance detection of the high bandwidth multimode fiber and packaging and warehousing of the finished products of the high bandwidth multimode fiber. The indexes of the high bandwidth multimode fiber ...

Ultralow-expansion coefficient high transparent glass-ceramics and method for producing its product

The present invention relates to a Li₂O-Al₂O₃-SiO₂ system ultra-low expansion coefficient high-transparency glass-ceramic and production method of the products. Calculated by weight percentage, the ultra-low expansion coefficient high-transparency glass-ceramic is composed of 3.2 to 4.6 percent of Li₂O, 18.0 to 23.6 percent of Al₂O₃, 64.1 to 69.4 percent of SiO₂, 0.3 to 0.8 percent of MgO, 0.8 to 2.5 percent of BaO, 0.3 to 0.8 percent of R₂O, 0.01 to 0.4 percent of Y₂O₃, 1.8 to 2.5 percent of TiO₂, 1.6 to 2.4 percent of ZrO₂, 1.1 to 1.8 percent of P₂O₅, 0.6 to 1.5 percent of Sb₂O₃, 0.3 to 1.0 percent of NaCl and 1.0 to 2.0 percent of NH₄NO₃. The heat-resistant glass plates and heat-resistant glass products can be manufactured by using the formula and the corresponding forming die.

Optical fiber coating feed system with revert prevention function

The invention provides an optical fiber coating feed system with material revert preventing function in optical fiber manufacture. The feed system is composed of a coating barrel storage tank, a buffer barrel and a coating cup. A coating barrel is placed in the coating barrel storage tank provided with a storage tank cover, the storage tank cover is provided with an air inlet pipe thereon extending into the coating barrel, and an electromagnetic valve is disposed on the air inlet pipe. A buffer barrel cover is provided on the upper part of the buffer barrel provided with an inner interlayer therein. Three liquid level sensors are disposed on the buffer barrel cover, the liquid level sensor I is disposed on the upper part of the buffer barrel, the liquid level sensor II is disposed at the bottom of the buffer barrel, the upper part of one side of the buffer barrel inner interlayer is provided with an overflow port, the top of the other side of the buffer barrel inner interlayer is provided ...

Device and method for manufacturing optical fiber prefabrication rod mandrel

The invention discloses a device and a method for manufacturing an optical fiber prefabrication rod mandrel and relates to manufacturing of the optical fiber prefabrication rod mandrel, in particular to the device and the method for manufacturing the optical fiber prefabrication rod mandrel through axial vapor deposition (VAD). The mandrel manufactured by the method can grow more uniformly along the axial direction and the core bag ratio fluctuates slightly. The device comprises a spherical reaction cavity, an exhaust pipeline, an upper cavity, a first blow lamp, a second blow lamp and a third blow lamp, a revolving shaft 5 and a suspension rod; and the upper cavity is provided with an air supplement port. During the preparation of a powder mandrel, a quartz glass target rod is arranged on the suspension rod, and then the suspension rod is placed in the reaction cavity, and hydrogen and oxygen are introduced into the blow lamp and then are ignited in the reaction cavity to produce oxyhydrogen ...

Equipment for loose body optical fiber prefabricated rod integral sintering desaeration and method thereof

The invention provides equipment for loose body optical fiber prefabricated rod integral sintering desaeration and a method thereof, which relate to a manufacture method of a single mold optical fiber prefabricated rod, in particular to equipment and method thereof for simultaneously carrying out vitrification and desaeration of the loose body optical fiber prefabricated rod. The equipment comprises a rod conveying device, a vacuum pump, a waste gas discharge stop valve, a quartz furnace core pipe cover plate, a graphite resistance furnace or an induction furnace, a carbon furnace core pipe, a quartz furnace core pipe, a pressure meter and a furnace inside gas inlet stop valve, wherein the quartz furnace core pipe is arranged in the carbon furnace core pipe, the middle part of the quartz furnace core pipe is provided with a sintering furnace, the upper part of the quartz furnace core pipe and the upper part of the carbon furnace core pipe are provided with the quartz furnace core pipe cover ...