WO2008049375A1 - Procédé de fabrication d'une fibre optique monomode présentant une faible pmd - Google Patents

Procédé de fabrication d'une fibre optique monomode présentant une faible pmd Download PDF

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Publication number
WO2008049375A1
WO2008049375A1 PCT/CN2007/070955 CN2007070955W WO2008049375A1 WO 2008049375 A1 WO2008049375 A1 WO 2008049375A1 CN 2007070955 W CN2007070955 W CN 2007070955W WO 2008049375 A1 WO2008049375 A1 WO 2008049375A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber
preform
optical fiber
polarization mode
tilting
Prior art date
Application number
PCT/CN2007/070955
Other languages
English (en)
Chinese (zh)
Inventor
Jie Luo
Raadjkoemar Matai
Xianyuan Ni
Weijun Tong
Qingrong Han
Honghai Wang
Original Assignee
Yangtze Optical Fibre And Cable Company, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yangtze Optical Fibre And Cable Company, Ltd. filed Critical Yangtze Optical Fibre And Cable Company, Ltd.
Publication of WO2008049375A1 publication Critical patent/WO2008049375A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C03B37/02745—Fibres having rotational spin around the central longitudinal axis, e.g. alternating +/- spin to reduce polarisation mode dispersion
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/03—Drawing means, e.g. drawing drums ; Traction or tensioning devices
    • C03B37/032—Drawing means, e.g. drawing drums ; Traction or tensioning devices for glass optical fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/10—Non-chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/36—Dispersion modified fibres, e.g. wavelength or polarisation shifted, flattened or compensating fibres (DSF, DFF, DCF)
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/06—Rotating the fibre fibre about its longitudinal axis

Definitions

  • the present invention relates to a method of fabricating a single mode fiber, and more particularly to a method for fabricating a low polarization mode dispersion single mode fiber suitable for high speed large preforms.
  • a single-mode fiber for a general communication backbone network only one mode, LP fll mode or HE U mode, is propagated.
  • the fundamental mode is also composed of two mutually orthogonal linear polarization modes.
  • An ideal single-mode fiber should have an ideal circularly symmetrical structure such that two orthogonal linearly polarized dies in the fiber have the same propagation characteristics, the degenerate mode.
  • the actual single-mode fiber always has imperfections, which causes the circular symmetry structure of the fiber to be broken, resulting in a difference in the refractive index of the mode associated with the two orthogonal polarization components of the fiber-based mode, which shows birefringence characteristics. If the input light pulse excites two orthogonally polarized components and travels along the fiber at different group velocities, this will result in pulse broadening, a phenomenon known as polarization mode dispersion.
  • Another method for reducing the PMD in the prior art is to introduce a device for horizontally twirling the fiber under the wire drawing or called the wire end to form a horizontally rotating mechanical wave, and use the fiber as a medium to transfer the mechanical wave to the preform in the wire drawing furnace.
  • the softened zone is plastically deformed and solidified into the drawn fiber.
  • This method of rotating the PMD is more suitable for the current high-speed wire drawing process and is widely used by fiber manufacturers. .
  • the number of turns per fiber twist depends on the drawing speed and the frequency of motor rotation, which is not fully adapted to significantly reduce the PMD parameters of the fiber in the current high-speed wire drawing process.
  • the structure can analyze the mechanical torsional waveform of the periodic reciprocating motion of the tilting wheel in the horizontal plane (ie, the spatial frequency of the fiber twist is defined as the number of twisted turns of the fiber per unit length, and the distribution function of the circle/meter along the length of the wire) is close to the sine Or the cosine function, theoretically the torsional waveform of the fiber is a sine or cosine function waveform.
  • 93109633.2 discloses a method for fabricating an optical fiber having low polarization mode dispersion, which still employs a similar pulsation system as described above to reduce the polarization mode dispersion coefficient, and the optical fiber core produced by the method has low roundness.
  • the fiber PMD is also not ideal, so it is not suitable for the high speed large preform drawing process. With the continuous expansion of the field of optical fiber application technology and the requirements of the manufacturing process, it is very beneficial to invent a method for manufacturing a low-polarization mode dispersion single-mode fiber suitable for a high-speed large preform.
  • the technical proposal of the invention is: fixing the optical fiber preform to the feeding rod mechanism with the rotating chuck at the top of the drawing furnace, and sending it to the drawing heating furnace to perform the drawing while rotating, and the drawn fiber is in the swaying system. Under the action of the torque, the optical fiber is forced to rotate around its axis, and then the torsion device is used for back-twisting to obtain a single mode fiber with low polarization mode dispersion.
  • the average average number of turns of the fiber is 2 ⁇ 60 circles/meter.
  • the waveform of the twisted number of the fiber along the length direction can realize the periodic combination of the constant amplitude constant frequency and the variable amplitude variable component.
  • the typical torsional waveform includes Three forms:
  • the torsional waveform does not include a constant amplitude and a constant frequency component and a non-torsion component b in one cycle.
  • the torsional waveform includes a constant amplitude and a constant frequency component and a non-torsion component in one cycle, and the torsional waveform includes in one cycle. Constant amplitude and constant frequency components, but not including non-torsion components.
  • the action of the swaying wheel of the swaying system includes three forms: a pair of swaying wheels are simultaneously stabilized in a vertical position, a pair of swaying wheels are axially symmetrically stabilized at a maximum inclination position, and a pair of swaying wheels are axially symmetrically erected The swing between the straight position and the maximum tilt position.
  • the tilting wheel is stable in a vertical position for a short period of time in order to avoid the high-frequency jitter of the optical wave generated by the pulsating system, which affects the performance of the optical fiber product.
  • the tilting wheel stays at the maximum tilting position for a short time to increase the fiber level.
  • the number of turns of the twist, and the reciprocating swing between the vertical position and the maximum tilt position of the tilting wheel is to make the fiber form a non-sinusoidal torsional waveform with frequency and amplitude disorder, and increase the two orthogonal components of the polarization mode dispersion birefringence of the single mode fiber. Energy coupling between.
  • the maximum swing angle of the plane in which the tilting wheel is located is typically 5 to 20 degrees.
  • the feed bar mechanism with the rotary chuck has a function of rotating the preform edge into the rod and a feed speed matching the drawing speed, and the rotary chuck can realize the uniform speed or the acceleration rotation function, and can also realize the one-way Or two-way rotation.
  • the optical fiber of the present invention has a polarization mode dispersion coefficient of not more than 0.03 ps/km 1/2 , and the torsional waveform is periodically repeated, and the length of the optical fiber including a torsional waveform is 2 to 50 m.
  • the swaying system used in the present invention causes the optical fiber to be twisted, and the effect thereof (mainly refers to the number of turns per metre of fiber twisted and the torsional waveform along the length of the optical fiber:) can be controlled by the angle of the swaying of the swaying wheel (Fig. 3) and The time distribution ratio of the action forms is controlled to achieve a reduction in the PMD of different types of single mode fibers.
  • the typical tilt angle of the plane in which the tilting wheel is located is 5 to 20°.
  • the back-twisting device referred to in the present invention is realized by means of the periodic elastic torsion of the optical fibers canceling each other under the interference of the guide wheels, thereby consciously increasing the number of the guide wheels and the distance of the optical fiber feeding and receiving device before the wire collecting device , to match the actual drawing speed to achieve the purpose of back.
  • the technical solution of the invention can significantly improve the uniformity of the thermal field of the preform in the drawing furnace
  • the optical fiber preform is sent to the drawing heating furnace to be drawn by rotating the rod feeding mechanism with the rotating chuck, and then the optical fiber is forced to rotate around the axis by the torque introduced by the swaying system.
  • the method of back-twisting by the twist-back device ensures the roundness of the core and reduces the PMD of the single-mode fiber.
  • the technical solution of the invention can significantly increase the number of torsion turns of the single mode fiber and provide more alternative fiber twist waveforms to reduce the PMD of the single mode fiber, so that the PMD coefficient is lower than 0.03 ps/km 1 / 2 ;
  • the driving force of the twisting of the optical fiber produced by the swaying system of the present invention is derived from the friction between the optical fiber moving in the drawing direction and the swaying wheel, which is different from the applied driving force of the disclosed swaying system and directly acts on the optical fiber.
  • the number of turns of the fiber is not affected by the drawing speed, and is especially suitable for the high speed drawing process;
  • the above-mentioned swaying system does not change the path of high-speed fiber drawing of the optical fiber during installation and use, it is different from the implementation method of changing the fiber drawing path of some announced swaying systems, and avoids possible high-frequency jitter of the optical fiber while introducing twisting. , the single mode fiber PMD is reduced without affecting the stability of the high speed wire drawing process.
  • Figure 1 is a schematic illustration of the process of the present invention.
  • Figure 2 is a schematic diagram of the radial force analysis of the fiber.
  • Figure 3 is a schematic view of the swinging angle of the tilting wheel.
  • Figure 4a is a typical torsional waveform diagram of a horizontal tumbling mode of the roller.
  • Figure 4b is a theoretical torsion waveform of a single-round continuous swing mode.
  • Figure 4c is a typical torsional waveform diagram achievable by the technical solution of the present invention.
  • the present invention fixes an optical fiber preform to a rod-in mechanism 1 equipped with a rotary chuck on the top end of the drawing furnace 2, and sends it to the drawing heating furnace 2 for rotation while drawing, and the drawn fiber passes through Bare fiber geometry monitor 3, cooling system 4, coating system 5, tilting system 6, wire drawing tension wheel, finished fiber geometry monitor 7, torsion device 8 and wire take-up system 9, fiber from drawing furnace to wire drawing
  • the tension wheel is always vertical.
  • the surface of the other system in contact with the fiber does not change the path of the fiber, that is, maintains good alignment of the fiber.
  • the movement of the fiber includes linear motion under the pulling force of the wire and torque introduced in the swaying system.
  • the optical fiber Under the action of the rotation of the wire drawing direction, the optical fiber is forced to rotate around its axis under the torque introduced by the swaying system, and the direction of the fiber rotation changes periodically with the reciprocating oscillation of the swaying wheel in parallel with the plane of the fiber.
  • Direction and form a unique mechanical wave, which can propagate along the fiber to the upstream direction of its drawing, this mechanical wave
  • this mechanical wave To reach the preform in the drawing furnace soft zone, softening the glass body plastic deformation region, and a new curing drawn optical fiber, and then back through the twisting means having a back-twist to obtain low polarization mode dispersion single mode fiber.
  • the average average number of turns of the fiber is 2 circles/meter, 10 rings/meter, 20 rings/meter, 25 cycles/meter, 30 cycles/meter, 40 cycles/meter, 50 cycles/meter or 2 ⁇ 60.
  • Circle/meter, the waveform of the fiber twisting circle distributed along the length direction can realize the periodic combination of constant amplitude constant frequency and variable amplitude frequency conversion components.
  • the typical torsional waveform includes three forms:
  • the torsional waveform does not include a constant amplitude and a constant frequency component and a non-torsion component b in one cycle.
  • the torsional waveform includes a constant amplitude and a constant frequency component and a non-torsion component in one cycle, and the torsional waveform includes in one cycle. Constant amplitude and constant frequency components, but not including non-torsion components.
  • the action of the swaying wheel of the swaying system includes three forms: a pair of swaying wheels are simultaneously stabilized in a vertical position, a pair of swaying wheels are axially symmetrically stabilized at a maximum inclination position, and a pair of swaying wheels are axially symmetrically erected The swing between the straight position and the maximum tilt position.
  • the tilting wheel is stable in a vertical position for a short period of time in order to avoid the high-frequency jitter of the optical wave generated by the pulsating system, which affects the performance of the optical fiber product.
  • the tilting wheel stays at the maximum tilting position for a short time to increase the fiber level.
  • the number of turns of the twist, and the reciprocating swing between the vertical position and the maximum tilt position of the tilting wheel is to make the fiber form a non-sinusoidal torsional waveform with frequency and amplitude disorder, and increase the two orthogonal components of the polarization mode dispersion birefringence of the single mode fiber. Energy coupling between.
  • the maximum swing angle of the plane in which the tilting wheel is located is typically 5 degrees, 10 degrees, 15 degrees or At 20 degrees
  • the feed bar mechanism with the rotary chuck has a function of rotating the preform side into the rod and a rod feeding speed matching the drawing speed.
  • the rotating chuck can realize the uniform speed or the acceleration rotation function, and can also realize the one-way. Or two-way rotation.
  • the optical fiber of the present invention has a polarization mode dispersion coefficient of not more than 0.03 ps/km 1/2 , and the torsional waveform is periodically repeated, and the length of the optical fiber including a torsional waveform is 2 to 50 m.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

Procédé de fabrication d'une fibre optique monomode présentant une faible PMD, comportant les étapes consistant à fixer une préforme de fibre à un mécanisme (1) d'émission disposé sur un four tirant (2) et pourvu d'un mandrin de rotation, envoyer la fibre optique dans le four tirant (2) et faire tourner la préforme tout en la tirant, forcer la fibre après traction à tourner autour de son axe sous l'action du couple produit par le système (6) de torsion, et à obtenir une fibre monomode présentant une faible PMD après le dispositif (8) de détorsion effectuant un processus de détorsion. Le procédé améliore l'uniformité du champ de chaleur produit dans la préforme à l'intérieur du four tirant et augmente le nombre de tours de torsion sur la fibre monomode. Ainsi, le coefficient de PMD de la fibre est diminué jusqu'à moins de 0,03 ps/km1/2.
PCT/CN2007/070955 2006-10-26 2007-10-25 Procédé de fabrication d'une fibre optique monomode présentant une faible pmd WO2008049375A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2006101248584A CN1959450A (zh) 2006-10-26 2006-10-26 适合高速大预制棒制造具有低偏振模色散单模光纤的方法
CN200610124858.4 2006-10-26

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Publication Number Publication Date
WO2008049375A1 true WO2008049375A1 (fr) 2008-05-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104556675A (zh) * 2013-10-15 2015-04-29 南京烽火藤仓光通信有限公司 单模光纤的制造方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1959450A (zh) * 2006-10-26 2007-05-09 长飞光纤光缆有限公司 适合高速大预制棒制造具有低偏振模色散单模光纤的方法
CN103113021B (zh) * 2013-01-11 2014-12-31 烽火通信科技股份有限公司 搓扭角度可调的光纤搓扭设备及光纤搓扭方法
CN111003602B (zh) * 2019-12-12 2021-08-06 郑炜铃 一种光纤退扭装置
CN111620560B (zh) * 2020-06-10 2021-11-09 长飞光纤光缆股份有限公司 一种拉丝光纤扭动控制装置、控制方法及多模光纤
CN114315125B (zh) * 2021-11-25 2023-03-10 江苏法尔胜光电科技有限公司 一种无扭保偏光纤的制备工艺

Citations (8)

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Publication number Priority date Publication date Assignee Title
CN1209792A (zh) * 1997-04-11 1999-03-03 康宁股份有限公司 用于在光纤中引入受控螺旋的方法和装置
US20020134114A1 (en) * 2000-11-29 2002-09-26 The Furukawa Electric Co., Ltd. Device for continuously twisting an optical fiber
CN1472153A (zh) * 2003-03-28 2004-02-04 �ӳɹ� 低偏振模色散单模光纤的制造方法及用该方法制备的光纤
JP2004085970A (ja) * 2002-08-28 2004-03-18 Masataka Nakazawa フォトニッククリスタル光ファイバ及びその製造方法
CN1663922A (zh) * 2004-03-01 2005-09-07 古河电子北美公司 拉制期间旋转光纤预型的光纤生产设备和方法
CN1684916A (zh) * 2002-09-25 2005-10-19 皮雷利＆C·有限公司 低偏振波型色散光纤维及其制造工艺和装置
WO2006058551A1 (fr) * 2004-12-02 2006-06-08 Prysmian Cavi E Sistemi Energia S.R.L. Methode, systeme et dispositif pour conferer une rotation predeterminee a une fibre optique
CN1959450A (zh) * 2006-10-26 2007-05-09 长飞光纤光缆有限公司 适合高速大预制棒制造具有低偏振模色散单模光纤的方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1209792A (zh) * 1997-04-11 1999-03-03 康宁股份有限公司 用于在光纤中引入受控螺旋的方法和装置
US20020134114A1 (en) * 2000-11-29 2002-09-26 The Furukawa Electric Co., Ltd. Device for continuously twisting an optical fiber
JP2004085970A (ja) * 2002-08-28 2004-03-18 Masataka Nakazawa フォトニッククリスタル光ファイバ及びその製造方法
CN1684916A (zh) * 2002-09-25 2005-10-19 皮雷利＆C·有限公司 低偏振波型色散光纤维及其制造工艺和装置
CN1472153A (zh) * 2003-03-28 2004-02-04 �ӳɹ� 低偏振模色散单模光纤的制造方法及用该方法制备的光纤
CN1663922A (zh) * 2004-03-01 2005-09-07 古河电子北美公司 拉制期间旋转光纤预型的光纤生产设备和方法
WO2006058551A1 (fr) * 2004-12-02 2006-06-08 Prysmian Cavi E Sistemi Energia S.R.L. Methode, systeme et dispositif pour conferer une rotation predeterminee a une fibre optique
CN1959450A (zh) * 2006-10-26 2007-05-09 长飞光纤光缆有限公司 适合高速大预制棒制造具有低偏振模色散单模光纤的方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104556675A (zh) * 2013-10-15 2015-04-29 南京烽火藤仓光通信有限公司 单模光纤的制造方法

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