CN102590929A - Method for continuously preparing fiber gratings on line - Google Patents
Method for continuously preparing fiber gratings on line Download PDFInfo
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- CN102590929A CN102590929A CN2012100353733A CN201210035373A CN102590929A CN 102590929 A CN102590929 A CN 102590929A CN 2012100353733 A CN2012100353733 A CN 2012100353733A CN 201210035373 A CN201210035373 A CN 201210035373A CN 102590929 A CN102590929 A CN 102590929A
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Abstract
The invention discloses a method for continuously preparing fiber gratings on line. According to the method, coating and curing of a prefabricated bar high-temperature drawn bare fiber and a bare fiber protective layer are separated. By the method, adverse interaction between a wire drawing process and an on-line grating write-in and coating process is eliminated; the method is easy to control; and the operation of a system is stable. In addition, mutual constraint factors between the processes are eliminated, the two processes are respectively performed under optimal process conditions, and many technical problems of conventional dynamic on-line grating formation are well solved.
Description
Technical field
The invention belongs to the fiber grating preparation field, relate to that on-line continuous writes grating in the optical fiber preparation process, especially high capacity writes full the method with grating.
Background technology
Have broad prospect of application based on fiber grating large-capacity distributing optical fiber sensing system, its core technology of preparing requirement diverse location on a long-distance optical fiber writes grating and introduces insertion loss as far as possible less.Traditional fiber grating preparation method prepares grating earlier, adopts solder technology that all gratings are connected in series again, and the method causes significant insertion loss.Simultaneously, welding causes the optical fiber structure damage, causes the system reliability variation.So; Researcher just begins exploration and in fiber draw process, carries out the fiber grating preparation very early; The dynamic online grating that the writes when wire drawing of prefabricated rods high temperature forms bare fibre carries out protective seam immediately and applies and curing process, and this method effectively avoids welding the insertion loss that causes; The optical fiber structure of avoiding simultaneously causing because of welding damages, and system reliability is obviously improved.
Yet the traditional raster preparation needs with many UV laser pulses irradiation optical fiber, and can't realize dynamic online preparation, so researcher has proposed the dynamically online method of writing grating of single laser pulse.That report the method the earliest is the people such as L Dong of University of Southampton
[1], adopt the monopulse holographic interferometry to be implemented in the dynamic online grating that writes in the light-sensitive optical fibre pulling process.The people such as Askins of US Naval Research Laboratory afterwards
[2]Improved above-mentioned method for making, the automatically online different a series of gratings of reflection wavelength that write.
Though above-mentioned report has realized that grating is online under the dynamic condition and write that this becomes grid method to have several big difficult points, cause the method to be difficult to form ripe grating technology of preparing.One, dynamic online the writing of grating requires drawing optical fibers to be controlled at than under the low velocity condition; Owing to influenced by each device control precision, low speed cannot say for sure to demonstrate,prove fibre-optical drawing stable operation, and naked fine diameter fluctuation is bigger; Two, write optical fiber background temperature, the stress that consistance grating requirement preferably grating writes a little and have stability and consistance preferably; Because system's slow running poor stability; And fiber optic temperature is cooled to grating by melt drawing place high temperature, and to write the influence factor of a lower temperature more; Cause grating to write background temperature a little, the stress consistance is unsatisfactory, badly influences the consistance that grating writes.Three, whether dynamic online one-tenth grid successfully write a difficult problem that becomes real-time monitoring.Because the fiber drawing furnace temperature at 1700-1800 ℃ of high temperature, itself is exactly a very strong wide light source, bias light imports monitor into along optical fiber, and its intensity possibly flooded the flashlight of optical grating reflection fully, causes might can't implementing the monitoring that grating is inscribed.
There are many difficult points, U.S. Anbo Wang seminar to the online grating of writing under the dynamic condition
[3]Adopted hydrogen-carrying photosensitivity-enhancing, phase mask method, under the stationary state on finished product optical fiber high capacity write grating, reported a kind of based on antiradar reflectivity entirely with the quasi-distributed sensing network of grating, optical fiber optical grating multiplexing quantity is near 1000.Owing to based on being carried out to grid technique on the finished product optical fiber, write grating after needing to ablate coat totally earlier, recover coat again.There are two open defects in this method.Carbon dioxide laser ablation coat can damage fibre cladding equally, causes optical fiber attenuation to increase; Because optical fiber structure sustains damage, optical fiber fractures easily, has influence on the reliability that the method is implemented to a certain extent.
List of references:
[1]L?Dong，JL?Archambault，L?Reekie，P?St?J?Russell，et?al.Single?pulse?Bragg?gratings?written?during?fiber?drawing.Electron?Lett，1993，29(17)：1577-1578；
[2]CG?Askins，MA?Putnam，GM?Williams，et?al.Stepped-wavelength?optical-fiber?Bragg?grating?arrays?fabricated?in?line?on?a?draw?tower.Opt?Lett，1994，19(2)：147-149；
[3]YM?Wang，JM?Gong，DY?Wang，et?al.A?quasi-di?stributed?sensing?network?with?time-division-multiplexed?fiber?Bragg?gratings.IEEE?Photon?Technology?Lett，2011，23(2)：70-72.
Summary of the invention
The object of the invention is intended to have many technological difficulties and the technical deficiency that self is difficult to overcome to the online one-tenth grid of conventional dynamic method; And prepare problems such as fiber grating poor reliability continuously based on finished product optical fiber, propose a kind of new on-line continuous and prepare the fiber grating method.This method is with traditional fiber preparation technology phase in; Be that prefabricated rods high temperature draws that naked fine technology applies with naked fine protective seam and curing process separates and carries out; And become grid technique to organically combine the on-line continuous; Solving the contradiction between drawing speed and system's operation stability, and problem such as optical fiber background temperature consistance difference.Because phase in optical fiber preparation technology, can be easily the optical fiber of maturation be carried hydrogen technology and be inserted into intermediate link, solve because of preparation of light-sensitive optical fibre prefabricated rods and the immature optical fiber sensitization technical barrier that causes of light-sensitive optical fibre drawing technology.
The object of the invention adopts following technical proposals to realize:
A kind of fiber grating preparation method, it is characterized in that: on-line continuous writes grating on bare fibre.
Technical scheme of the present invention: drawing optical fibers technology and fiber optic protection layer are applied and curing process separates and carries out; On-line continuous writes grating on the bare fibre that drawing optical fibers technology makes, and carries out protective seam immediately and applies and the protective seam curing process.
In the technical scheme of the present invention: described bare fibre is the photosensitive bare fibre that directly draws or carries the photosensitive bare fibre of Hydrogen.
In the technical scheme of the present invention: described drawing optical fibers technology is carried out under high drawing speed condition, and to guarantee bare fibre diameter high-precision control, for high 10 meters wire-drawer-tower, drawing speed is tens to hundreds of rice per minute; Be greater than or less than for 10 meters for the wire-drawer-tower tower height, drawing speed is tens to hundreds of rice per minute.
In the technical scheme of the present invention: the described online grating that writes carries out under low bare fibre translational speed or quiescent conditions, has consistance preferably to guarantee the online grating that writes.To the online grating that writes of monopulse laser, the bare fibre translational speed is not higher than 20 meters per minutes.
In the technical scheme of the present invention: when monopulse laser on-line continuous write grating and changes the multiple-pulse on-line continuous into and write grating, the bare fibre translational speed was zero when grating was inscribed, and write success to guarantee strong reflection rate grating.Because dynamic condition can not carry out down many laser pulses inscription high light grid, and can only under quiescent conditions, carry out, be to realize that multiple-pulse writes the high light grid and write grating with wire drawing limit, front.
In the technical scheme of the present invention: the online grating that writes carries out under room temperature or controlled constant temperature, and the optical fiber background temperature that grating is write a little has consistance preferably, has consistance preferably to guarantee the online grating that writes.Because in the drawing process, optical fiber is reduced to grating by high temperature and writes lower temperature a little, it is more influenced by extraneous factor, can cause optical fiber inconsistent in the temperature that grating writes a little; And do not exist this problem, fiber optic temperature to have the stability of room temperature after the phase in.
In the technical scheme of the present invention: described drawing process and protective seam apply and the curing process phase in; Its effect one is to be convenient to that bare fibre is carried out high ballast hydrogen make it have photosensitivity, applies and on bare fibre, write continuously during curing process grating thereby be implemented in; Its effect two is to eliminate drawing process and the dynamically online conflicting restriction that writes between the grating technology, guarantees to carry out under each comfortable top condition of two technologies.
Characteristics of the present invention: because with the phase in of optical fiber preparation technology, drawing process and grating be online to be write and coating processes separates and carries out, and the mutual negative effect effect between technology is eliminated, and control more is prone to realize that system moves more stable.In addition, the mutual restriction factor is eliminated between technology, carries out under two each comfortable optimum process condition of cover technology, can under high-speed, carry out like drawing process, guarantees system stable operation, the high-precision control of naked fine diameter; And online one-tenth grid and coating processes carry out under room temperature low speed or stationary state, solve many technological difficulties of the online one-tenth grid of conventional dynamic well.
Description of drawings
Fig. 1 draws and the take-up synoptic diagram for bare fibre
Fig. 2 carries online grating and the armor coated and curing synoptic diagram write of hydrogen bare fibre
Among the figure: 1-prefabricated rods pay-off, 2-fiber drawing furnace, 3-bare fibre caliper, 4-bare fibre, 5-tensile measurer, the 6-wheel that reels off raw silk from cocoons, 7-reels off raw silk from cocoons, the take-up speed coalignment, the 8-take-up reel.9-carries the hydrogen bare fibre, 10-optical fiber guide-localization wheel, and 11-grating writing station, 12-applies for the first time, and 13-solidifies for the first time, and 14-applies for the second time, and 15-solidifies for the second time.
Specific embodiments
According to description of drawings form of implementation of the present invention.Moreover, in description of drawings, identical unit additional phase mark together, and omit repeat specification.
Fig. 1 draws and the take-up synoptic diagram for bare fibre.This technology and conventional fiber wire drawing are basic identical, and unique difference is not have the coating and the curing process of fiber optic protection layer.Prefabricated rods is under fiber drawing furnace 2 high temperature actions, and its lower end fused biconical taper becomes silk, imports the wheel 6 that the reels off raw silk from cocoons formation bare fibre that reels off raw silk from cocoons through tensile measurer 5; Speed through bare fibre caliper 3 monitoring bare fibre diameters and real-time FEEDBACK CONTROL prefabricated rods pay-off 1 and bare fibre 4 realizes the stable control of bare fibre diameter.Bare fibre 4 is under the wheel effect of reeling off raw silk from cocoons, and through reeling off raw silk from cocoons, collecting on the take-up reel 8 behind the take-up speed coalignment 7.Because online inscription requires the fiber stress stable and consistent of exposure station entirely with grating; At first high request is proposed bare fibre external diameter stability; This need the drawing speed of prefabricated rods pay-off 1 charging rate and bare fibre 4 stable and mate suitable; Simultaneously also need fiber drawing furnace 2 temperature constant constant, can guarantee that just the bare fibre diameter is controlled in the acceptability limit.Telecommunication optical fiber production control scope is increased to desired value ± 0.4 μ m or higher with bare fibre outside diameter control precision at desired value ± 0.7 μ m (micron) among the present invention at present.
Owing to influenced by each equipment operation control accuracy, system is the stable control of difficult realization under low drawing speed, and the fluctuation of bare fibre external diameter is big; The high drawing speed of normal conditions better guarantees each stable equipment operation and accurately control, guarantees the control of bare fibre diameter within close tolerance.Yet; Because the bare fibre flexural strength is low; The minor fluctuations of dish process high speed operation is bigger to the bare fibre bend crash in take-up, is prone to cause bare fibre to fracture, so dish need carry out under best drawing speed condition in bare fibre drawing and the take-up; To guarantee the high-precision control of bare fibre diameter, simultaneity factor can reliable and stable operation.For high about 10 meters wire-drawer-tower, best bare fibre draw rate is controlled at tens to hundreds of rice per minute.
Fig. 2 for carry the hydrogen bare fibre be the on-line continuous of example write grating and armor coated with solidify synoptic diagram.After dish is accomplished in the bare fibre take-up, make it have photosensitivity, go up tower again and carry out the grating on-line continuous and write and carry out protective seam coating and curing process through high ballast hydrogen.Carry hydrogen bare fibre 9 through angle sheave 10, tensile measurer 5 guide-localizations, under wheel 6 effects of reeling off raw silk from cocoons, carry out the grating inscription and apply and curing process with protective seam.Receive angle sheave 10, tensile measurer 5 positioning actions; Optical fiber is with the certain speed operation and keep good vertical state; Grating writing station 11 is writing grating equally spacedly near angle sheave 10 on the optical fiber that at the uniform velocity moves; Get into subsequently apply for the first time 12 with solidify 13 for the first time, carry out following closely with apply the similar second time for the first time 14 with solidify 15 for the second time, coil in the take-up at last.
Owing to adopt the 248nm lasing light emitter to combine mask plate monopulse laser on moving fiber, to write grating; Optical fiber moves the position that can change the laser action fiber optic point; Thereby have influence on grating period profile quality, macroscopical presentation is that optical grating reflection Gaussian peak peak shape is degenerated, and the peak broadens, intensity weakens; This is unfavorable for the back end signal processing very much for weak reflection grating.Solution is to reduce the optical fiber translational speed, makes optical fiber have rational translational speed, guarantees that the optical grating reflection peak has preferable peak shape and intensity.For the 10nm laser pulse was inscribed centre wavelength 1550nm grating, the optical fiber translational speed was not higher than 20 meters per minutes.
Because technological process phase among the present invention; Optical fiber translational speed size does not receive drawing process control restriction in dynamic online one-tenth grid and protective seam coating and the curing process; Optical fiber speed can write according to grating and require optimal setting; And the highly stable unanimity of speed, thereby can guarantee well that tension force is steady in a long-term in the optical fiber.Further expand the method, can realize that the on-line continuous of multiple-pulse strong reflection grating writes, grating is write and fashionable the optical fiber translational speed is set at zero, and after accomplishing grating and inscribing, moving fiber carries out coating processes and prepares next grating and inscribe again.Inscribe owing to carry out grating under the stationary state, the starting condition that grating is inscribed is more easy to control, and consistance can be higher better between grating inscription success ratio and grating; Setting laser is inscribed pulse number easily simultaneously, realizes that the grating of different reflection strengths is inscribed.
Because technological process phase among the present invention; Optical fiber background temperature does not receive that the fiber drawing furnace high-temperature factor influences in the drawing process; Constant operating ambient temperature can guarantee preferably that optical fiber background temperature stabilization is consistent, thereby is complete in the online starting condition that facilitates that writes of grating.
Because technological process phase among the present invention, on-line continuous become grid and protective seam coating and curing process at room temperature to carry out, efficiently solve that fiber drawing furnace background light source causes a real-time monitoring difficult technologies difficult problem in the online one-tenth grid of conventional dynamic.In addition,, badly influence the optical signal transmission distance, carry out grating when inscribing on-line monitoring from optical fiber one end, the grating limited amount that can inscribe because it is bigger to carry the hydrogen optical fiber attenuation when inscribing grating; Because the phase in of drawing process process, the on-line monitoring that carries out the grating inscription respectively from the optical fiber two ends becomes possibility, so the grating quantity that one-time continuous is inscribed doubles.
Claims (9)
1. fiber grating preparation method, it is characterized in that: on-line continuous writes grating on bare fibre.
2. fiber grating preparation method as claimed in claim 1 is characterized in that: drawing optical fibers technology is separated with coating of fiber optic protection layer and curing process carry out; On-line continuous writes grating on the bare fibre that drawing optical fibers technology makes, and carries out protective seam immediately and applies and the protective seam curing process.
3. fiber grating preparation method as claimed in claim 1 is characterized in that: photosensitive bare fibre or year Hydrogen photosensitive bare fibre of described bare fibre for directly drawing.
4. fiber grating preparation method as claimed in claim 2 is characterized in that: described drawing optical fibers technology is carried out under high drawing speed condition, and for high 10 meters wire-drawer-tower, drawing speed is tens to hundreds of rice per minute.
5. fiber grating preparation method as claimed in claim 2 is characterized in that: described drawing optical fibers technology is carried out under high drawing speed condition, is greater than or less than for 10 meters for the wire-drawer-tower tower height, and drawing speed is tens to hundreds of rice per minute.
6. according to claim 1 or claim 2 fiber grating preparation method, it is characterized in that: the described online grating that writes carries out under low bare fibre translational speed or quiescent conditions.
7. fiber grating preparation method as claimed in claim 6 is characterized in that: the described online grating that writes carries out under low bare fibre translational speed, and to the online grating that writes of monopulse laser, the bare fibre translational speed is not higher than 20 meters per minutes.
8. fiber grating preparation method as claimed in claim 7 is characterized in that: when monopulse laser on-line continuous write grating and changes the multiple-pulse on-line continuous into and write grating, the bare fibre translational speed was zero when grating was inscribed.
9. like claim 1-5,7,8 each described fiber grating preparation methods, it is characterized in that: the online grating that writes carries out under room temperature or controlled constant temperature.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777270A (en) * | 2014-02-11 | 2014-05-07 | 武汉理工大学 | Device and method for automatic, static continuous preparation of fiber bragg grating array |
| CN103869409A (en) * | 2014-03-24 | 2014-06-18 | 江苏南方通信科技有限公司 | On-line manufacturing method of optical fiber grating |
| CN103900620A (en) * | 2014-03-20 | 2014-07-02 | 何祖源 | Device and method for continuously manufacturing optical fiber sensors |
| CN104181635A (en) * | 2014-08-15 | 2014-12-03 | 山东省科学院激光研究所 | Intensity distribution type demodulation system and distribution type sensing optical fiber |
| CN104635295A (en) * | 2015-03-17 | 2015-05-20 | 武汉理工大学 | On-line optical fiber grating preparing system |
| CN104678486A (en) * | 2015-03-17 | 2015-06-03 | 武汉理工大学 | Preparation method of fiber grating |
| CN105259610A (en) * | 2015-11-20 | 2016-01-20 | 武汉理工大学 | Device and method for multi-wavelength switching in order in fiber bragg grating array on-line preparation |
| CN105783956A (en) * | 2016-05-16 | 2016-07-20 | 武汉理工大学 | Large-capacity weak grating array processing apparatus and method |
| CN105891945A (en) * | 2016-06-24 | 2016-08-24 | 西安盛佳光电有限公司 | Continuous production method of fiber bragg grating (FBG) |
| WO2016192339A1 (en) * | 2015-06-05 | 2016-12-08 | 江苏斯德雷特通光光纤有限公司 | Butt joint and wire-drawing technology for preform rods |
| CN106772739A (en) * | 2017-03-03 | 2017-05-31 | 武汉理工大学 | A kind of dim light grid array preparation method and control system |
| CN106802450A (en) * | 2016-12-19 | 2017-06-06 | 湖北工业大学 | The automatic full preparation facilities with fiber grating string of multi-wavelength is complete with method and multi-wavelength with fiber grating string |
| CN107340565A (en) * | 2017-08-25 | 2017-11-10 | 武汉理工大学 | A kind of online device and method for preparing optical fiber optical grating array automatic switchover wavelength |
| CN107907934A (en) * | 2017-12-07 | 2018-04-13 | 河北工程大学 | A kind of method for preparing optical fiber |
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| CN1166208A (en) * | 1995-10-16 | 1997-11-26 | 住友电气工业株式会社 | Optical fiber diffraction grating, prodn. method thereof and laser light source |
| CN201477226U (en) * | 2009-08-31 | 2010-05-19 | 常州南方通信科技有限公司 | Online fiber optical grating manufacturing device |
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| US5400422A (en) * | 1993-01-21 | 1995-03-21 | The United States Of America As Represented By The Secretary Of The Navy | Technique to prepare high-reflectance optical fiber bragg gratings with single exposure in-line or fiber draw tower |
| CN1166208A (en) * | 1995-10-16 | 1997-11-26 | 住友电气工业株式会社 | Optical fiber diffraction grating, prodn. method thereof and laser light source |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777270A (en) * | 2014-02-11 | 2014-05-07 | 武汉理工大学 | Device and method for automatic, static continuous preparation of fiber bragg grating array |
| CN103900620A (en) * | 2014-03-20 | 2014-07-02 | 何祖源 | Device and method for continuously manufacturing optical fiber sensors |
| CN103900620B (en) * | 2014-03-20 | 2016-03-30 | 上海交通大学 | A kind of device and method of continuous manufacture Fibre Optical Sensor |
| CN103869409A (en) * | 2014-03-24 | 2014-06-18 | 江苏南方通信科技有限公司 | On-line manufacturing method of optical fiber grating |
| CN104181635A (en) * | 2014-08-15 | 2014-12-03 | 山东省科学院激光研究所 | Intensity distribution type demodulation system and distribution type sensing optical fiber |
| CN104635295B (en) * | 2015-03-17 | 2018-01-09 | 武汉烽理光电技术有限公司 | A kind of online fiber grating preparation system |
| CN104635295A (en) * | 2015-03-17 | 2015-05-20 | 武汉理工大学 | On-line optical fiber grating preparing system |
| CN104678486A (en) * | 2015-03-17 | 2015-06-03 | 武汉理工大学 | Preparation method of fiber grating |
| CN104678486B (en) * | 2015-03-17 | 2018-09-04 | 武汉烽理光电技术有限公司 | A kind of preparation method of fiber grating |
| WO2016192339A1 (en) * | 2015-06-05 | 2016-12-08 | 江苏斯德雷特通光光纤有限公司 | Butt joint and wire-drawing technology for preform rods |
| CN105259610A (en) * | 2015-11-20 | 2016-01-20 | 武汉理工大学 | Device and method for multi-wavelength switching in order in fiber bragg grating array on-line preparation |
| CN105259610B (en) * | 2015-11-20 | 2018-11-30 | 武汉烽理光电技术有限公司 | A kind of optical fiber optical grating array prepares the orderly switching device of multi-wavelength and method online |
| CN105783956A (en) * | 2016-05-16 | 2016-07-20 | 武汉理工大学 | Large-capacity weak grating array processing apparatus and method |
| CN105891945A (en) * | 2016-06-24 | 2016-08-24 | 西安盛佳光电有限公司 | Continuous production method of fiber bragg grating (FBG) |
| CN106802450A (en) * | 2016-12-19 | 2017-06-06 | 湖北工业大学 | The automatic full preparation facilities with fiber grating string of multi-wavelength is complete with method and multi-wavelength with fiber grating string |
| CN106772739A (en) * | 2017-03-03 | 2017-05-31 | 武汉理工大学 | A kind of dim light grid array preparation method and control system |
| CN107340565A (en) * | 2017-08-25 | 2017-11-10 | 武汉理工大学 | A kind of online device and method for preparing optical fiber optical grating array automatic switchover wavelength |
| CN107340565B (en) * | 2017-08-25 | 2018-10-09 | 武汉理工大学 | A kind of online device and method for preparing optical fiber optical grating array and automatically switching wavelength |
| CN107907934A (en) * | 2017-12-07 | 2018-04-13 | 河北工程大学 | A kind of method for preparing optical fiber |
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Application publication date: 20120718 |