CN106646708B - It is a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance - Google Patents
It is a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance Download PDFInfo
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- CN106646708B CN106646708B CN201611041092.3A CN201611041092A CN106646708B CN 106646708 B CN106646708 B CN 106646708B CN 201611041092 A CN201611041092 A CN 201611041092A CN 106646708 B CN106646708 B CN 106646708B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1847—Manufacturing methods
- G02B5/1857—Manufacturing methods using exposure or etching means, e.g. holography, photolithography, exposure to electron or ion beams
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Abstract
The present invention provides a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance, and the specific structure device that this method uses includes：Excimer pulse ultraviolet source, beam shaping optical path, phase grating mask plate, optical fibre positioning system and optical fiber inscribe on-line monitoring system, and the optical fibre positioning system includes fiber clamp, three-dimensional trim holder and pretightning force bringing device.Using the method inscribed in advance in the present invention, the accurate application to pretightning force size needed for specified wavelength is realized, reduce the uncertainty for inscribing the Bragg reflection wavelength of FBG.
Description
Technical field
The present invention relates to the technical field for inscribing fiber grating, in particular to a kind of predispersed fiber carving and writing method is successively realized
The accurate inscription of optic fiber grating wavelength.
Background technique
Fiber bragg grating (Fiber Braag Grating, hereinafter referred to as FBG), nearly half since being optical fiber invention
In century, one of mostly important photonic device developed, with high sensitivity, small in size, light-weight, electromagnetism interference
The advantages that, it is widely applied in the fields such as optical fiber laser, fiber optic communication and Fibre Optical Sensor.
At present common FBG production method there are several types of：Double-beam holographic interference transverse direction wrting method, point light source wrting method
With phase mask plate method.
Phase mask plate method:By producing different phase mask plates, then by optical fiber as phase mask plate after, adopt
With ultraviolet laser to exposed optical fiber, to obtain the FBG of different bandwidth.This method advantage is：Simple process, it is reproducible, at
Product rate is high, convenient for large-scale production；Screen periods are unrelated with the optical source wavelength of exposure.The disadvantage is that the cost of manufacture of the method
Valuableness, a kind of every FBG for making bandwidth need to configure one piece of corresponding phase mask plate.In order to reduce the production of phase mask plate method
Cost, it will usually be realized using pretightning force technology and write out different Bragg reflection kernel wavelength using one piece of phase mask carving
FBG.This is currently used FBG mass production method.
In the existing FBG carving and writing method using phase mask plate, the pretightning force of application is generally empirical value, passes through
Experiment finds out optical fiber and applies pretightning force and inscribe the relationship between wavelength.It is pre- needed for specified wavelength being calculated by interpolation method
Clamp force size.The pretightning force and actual conditions that interpolation calculation comes out have deviation, and therefore, the Bragg that existing method inscribes FBG is anti-
It is larger to penetrate central wavelength uncertainty, generally ± 0.5nm.
Summary of the invention
A kind of method inscribed in advance is provided in the present invention, realizes accurately applying to pretightning force size needed for specified wavelength
Add, reduces the Bragg reflection kernel wavelength uncertainty for inscribing out FBG.
The technical solution adopted by the present invention is that：It is a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance, this method uses
Constructional device by excimer pulse ultraviolet source, beam shaping optical path, phase grating mask plate, optical fibre positioning system and optical fiber
On-line monitoring system composition is inscribed, the optical fibre positioning system includes fiber clamp, and three-dimensional trim holder and pretightning force apply dress
It sets, which includes the following steps：
1) optical fiber waits inscribing part progress window and strips, and optical fiber both ends incoming fiber optic is inscribed on-line monitoring system；Institute
It is by the ultraviolet hardening resin softening removal coat of optical fiber surface that the window stated, which strips,.
2) optical fiber is installed to optical fibre positioning system, and applies pretightning force, the pretightning force by applying manually, really
It is exceptionally straight to protect optical fiber；
3) it is inscribed in advance, optical fiber inscribes on-line monitoring system and monitors FBG back wave, records reflection kernel wavelength XP1；In advance
The scribing process of inscription is to export 1 pulse by control excimer pulse ultraviolet source with minimum output power to realize to optical fiber
Pre- inscription；
4) optical fiber is taken out from optical fibre positioning system, optical fiber inscribes on-line monitoring system and monitors FBG back wave, note reflection
Central wavelength lambdaP2；Optical fiber takes out from positioning system, needs to keep relaxed state；
5) according to the required Bragg reflection kernel wavelength X for inscribing FBGBAnd calculate the reflection kernel wave after pretightning force changes
Long λP3；Reflection kernel wavelength XP3It is indicated with formula (1)；
6) optical fiber is installed to optical fibre positioning system, pretightning force is applied by pretightning force bringing device and changes inscription reflection
The reflection kernel wavelength at peak is to λP3Until；
7) it is normally inscribed, optical fiber inscribes reflectance spectrum/transmission spectrum of on-line monitoring system monitoring FBG, until its satisfaction
The Bragg reflection kernel wavelength X of FBGB；The scribing process normally inscribed is by control excimer pulse ultraviolet source with normal
Output power exports normal inscription of several pulses realization to optical fiber；Requirement is inscribed when meeting FBG, it is purple to stop excimer pulse
Outer light source output.
8) optical fiber is taken out from optical fibre positioning system, monitor and records its Bragg reflection kernel wavelength；Optical fiber is from positioning
System is taken out, and needs to keep relaxed state.
Preferably, optical fiber inscription on-line monitoring system includes：ASE wideband light source, circulator, 1x2 photoswitch, light
Tie jumper between spectrum analysis instrument and component, the circulator are three port circulators, the ASE wideband light source, 1x2
Photoswitch and spectroanalysis instrument are connect with three ports of circulator respectively by tie jumper；It is real-time that optical fiber inscribes on-line system
Reflection kernel wavelength is monitored, the ASE wideband light source is for providing monitoring optical path light source；Circulator will be for that will monitor optical path light
Source is introduced into the FBG in inscribing, and reflected light is introduced 1x2 photoswitch；1x2 photoswitch be used for switch FBG reflectance spectrum and thoroughly
Penetrate spectrum；The spectrum and implementation that spectroanalysis instrument is used to analyze FBG show relevant Bragg reflection kernel wavelength.
Preferably, the laser of excimer pulse ultraviolet source transmitting predetermined wavelength.
Preferably, the beam shaping optical path by pulsed ultraviolet light for expanding and focusing on phase grating mask plate
On.
Preferably, the optical fibre positioning system is used to carry out optical fiber space position positioning and carry out to optical fiber pretightning force
Adjustment, the fiber clamp are fixedly connected for grip optical fiber and with three-dimensional trim holder, and three-dimensional trim holder is used for optical fiber height
Degree and phase grating mask plate distance are adjusted, and pretightning force bringing device is for being adjusted optical fiber longitudinal pulling force.
The beneficial effects of the invention are as follows：Compared with prior art, it using pre- carving and writing method, realizes to needed for specified wavelength
The accurate application of pretightning force size obtains the FBG of specified reflection kernel wavelength.
Detailed description of the invention
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage are by the as follows of embodiment through the invention
Description is illustrated, wherein：
Fig. 1 diagrammatically illustrates Written Device structural block diagram of the present invention.
Specific embodiment
By reference to exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to exemplary embodiment as disclosed below；Can by different form come
It is realized.The essence of specification is only to aid in those skilled in the relevant arts' Integrated Understanding detail of the invention.
Hereinafter, the embodiment of the present invention will be described with reference to the drawings.In the accompanying drawings, identical appended drawing reference represents identical
Or similar component or same or like step.
Embodiment 1
The present invention provides a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance, and structure is by excimer pulse purple
Outer light source, beam shaping optical path, phase grating mask plate, optical fibre positioning system and optical fiber inscribe on-line monitoring system composition, quasi-
Molecule pulsed UV light source generates pulsed ultraviolet light, focuses on phase grating mask plate through beam shaping optical path, phase mask
± l grades of diffraction light of plate generation, the interference light that diffraction light is formed are exposed inscription FBG to by optical fiber.In scribing process, first
It is inscribed in advance, controls excimer pulse ultraviolet source with minimum output power and export 1 pulse, optical fiber inscribes on-line monitoring system
The reflectance spectrum of system monitoring FBG, monitors the pre- reflection kernel wavelength for inscribing reflection peak；Then inscription wavelength as needed, passes through
It calculates, applies pretightning force and the reflection peak central wavelength is made to float to designated position (calculated reflection kernel wavelength location),
Normally inscribed.
Fig. 1 diagrammatically illustrates Written Device structural block diagram of the present invention.As shown in Figure 1：Written Device is by excimer pulse
Ultraviolet source 101, beam shaping optical path 102, phase grating mask plate 103, optical fibre positioning system 104 and optical fiber inscribe online prison
Examining system 105 forms.The pulsed ultraviolet light that excimer pulse ultraviolet source 101 generates, expands and gathers through beam shaping optical path 102
On coke to phase grating mask plate 103, light beam is formed by ± l grades of diffraction light of 103 generations of phase grating mask plate, diffraction light
Interference light is exposed inscription FBG to by optical fiber.It is specific to inscribe shown in steps are as follows：
Part to be inscribed carries out window and strips on step 1) optical fiber, and optical fiber both ends incoming fiber optic is inscribed on-line monitoring system
System.
It is to soften the ultraviolet hardening resin of optical fiber surface that window, which strips, removes coat, strips coating layer method：Hand
It is dynamic strip, strip automatically, chemical stripping and laser strip.
It includes ASE wideband light source, circulator, 1x2 photoswitch, spectroanalysis instrument and a that optical fiber, which inscribes on-line monitoring system,
Tie jumper between component, the circulator are three port circulators, the ASE wideband light source, 1x2 photoswitch and light
Spectrum analysis instrument is connect with three ports of circulator respectively by tie jumper；ASE wideband light source is for providing monitoring optical path light
Source；Circulator is used to monitor optical path light source and is introduced into the FBG in inscribing, and reflected light is introduced 1x2 photoswitch；1x2 photoswitch
For switching the reflectance spectrum and transmitted spectrum of FBG, spectrum and implementation of the spectroanalysis instrument for analyzing FBG show relevant
Bragg reflection kernel wavelength.
The optical fiber of removal coat is connect by coupler with ASE wideband light source and spectrometer, in scribing process in real time
Monitoring back wave central wavelength and other parameters include the welding in the spectral line characteristic and production fiber grating scribing process of optical fiber
Loss etc..
Step 2) optical fiber is installed to optical fibre positioning system, and applies small pretightning force, and pretightning force size ensures optical fiber
It is exceptionally straight.
Optical fibre positioning system is used to carry out optical fiber space position to position and be adjusted optical fiber pretightning force, fiber orientation
System includes：Fiber clamp, three-dimensional trim holder, pretightning force bringing device；Fiber clamp is adjusted for grip optical fiber and with three-dimensional
Frame is fixedly connected, and three-dimensional trim holder is used to adjust optical fiber height and phase grating mask plate distance；Pretightning force bringing device is used
It is adjusted in optical fiber longitudinal pulling force.
The pretightning force bringing device is connect with lifting platform, is adjusted lifting platform height by differential head, is changed pretightning force
Bringing device acts on the active force on optical fiber.
Step 3) controls excimer pulse ultraviolet source and exports 1 pulse with minimum output power, carries out to optical fiber pre-embossed
It writes, meanwhile, the reflectance spectrum of on-line monitoring system monitoring FBG is inscribed using optical fiber, monitors a faint pre- inscription reflection peak,
Record reflection kernel wavelength is λP1。
Inscribing specific implementation process in advance is：The laser beam of the predetermined wavelength of Laser emission passes through beam shaping, expands simultaneously
Focus on phase grating mask plate；Three-dimensional adjustable shelf is adjusted, the exposure area center of the optical fiber in positioning system and grating phase are made
Position mask plate center is consistent；It controls excimer pulse ultraviolet source and 1 pulse is exported with minimum output power, it is high to adjust lifting platform
Degree, by applying faint longitudinal pulling force to optical fiber manually；Light beam passes through ± l grades of diffraction light of phase grating mask plate generation, diffraction
The interference light that light is formed is exposed inscription to optical fiber, while optical fiber inscribes the reflectance spectrum of on-line monitoring system monitoring FBG, monitoring
The pre- inscription reflection peak faint to one.
Step 4) takes out optical fiber from optical fibre positioning system, and keeps relaxed state, meanwhile, monitor reflection kernel wavelength
For λP2。
Step 5) is according to the required Bragg reflection kernel wavelength X for inscribing FBGBAnd it calculates in the reflection after pretightning force changes
Heart wavelength XP3, wherein λP3It is indicated with formula (1).
Step 6) monitoring on-line monitoring system inscribes the reflection kernel wavelength of reflection peak in advance, controls pretightning force bringing device,
Apply pretightning force and changes the reflection kernel wavelength for inscribing reflection peak to λP3Until.
Step 7) controls excimer pulse ultraviolet source and exports several pulses with normal output power, carves to optical fiber
It writes, meanwhile, reflectance spectrum/transmission spectrum of on-line monitoring system monitoring FBG is inscribed using optical fiber, until it meets FBG writing parameters
It is required that stopping the output of excimer pulse ultraviolet source.
Step 8) will be taken out in FBG optical fibre positioning system, and keep relaxed state, detects and records in its Bragg reflection
The relevant parameters such as cardiac wave length.
Present invention uses pre- carving and writing methods, and by adjusting the size of pretightning force, real-time monitoring back wave central wavelength subtracts
The uncertainty of the small Bragg reflection kernel wavelength for inscribing FBG.
In conjunction with the explanation and practice of the invention disclosed here, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (5)
1. a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance, the constructional device that this method uses includes excimer pulse
Ultraviolet source, beam shaping optical path, phase grating mask plate, optical fibre positioning system and optical fiber inscribe on-line monitoring system, described
Optical fibre positioning system include fiber clamp, three-dimensional trim holder and pretightning force bringing device, the carving and writing method includes following step
Suddenly：
1) optical fiber waits inscribing part progress window and strips, and optical fiber both ends incoming fiber optic is inscribed on-line monitoring system；
2) optical fiber is installed to optical fibre positioning system, and applies pretightning force；
3) it is inscribed in advance, optical fiber inscribes on-line monitoring system and monitors FBG back wave, records reflection kernel wavelength XP1；
4) optical fiber is taken out from optical fibre positioning system, optical fiber inscribes on-line monitoring system and monitors FBG back wave, records in reflection
Heart wavelength XP2；
5) according to the required Bragg reflection kernel wavelength X for inscribing FBGBAnd calculate the reflection kernel wavelength X after pretightning force changesP3；
6) optical fiber is installed to optical fibre positioning system, applies pretightning force and changes the reflection kernel wavelength for inscribing reflection peak to λP3For
Only；
7) it is normally inscribed, optical fiber inscribes reflectance spectrum/transmission spectrum of on-line monitoring system monitoring FBG, until it meets FBG's
Bragg reflection kernel wavelength XB；
8) optical fiber is taken out from optical fibre positioning system, monitor and records its Bragg reflection kernel wavelength.
2. according to claim 1 a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance, which is characterized in that described
The scribing process of pre- inscription in step 3) is：1 is exported by control excimer pulse ultraviolet source with minimum output power
Optical fiber is inscribed in pulse in advance.
3. according to claim 1 a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance, which is characterized in that described
Step 5) reflection kernel wavelength XP3It is indicated with formula (1),
4. according to claim 1 a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance, which is characterized in that described
Step 7) in the scribing process normally inscribed be to be exported by control excimer pulse ultraviolet source with normal output power
The normal inscription to optical fiber is realized in several pulses.
5. according to claim 1 a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance, which is characterized in that described
Optical fiber inscribe on-line monitoring system include：Between ASE wideband light source, circulator, 1x2 photoswitch, spectroanalysis instrument and component
Tie jumper, the circulator is three port circulators, the ASE wideband light source, 1x2 photoswitch and spectroanalysis instrument
It is connect respectively with three ports of circulator by tie jumper.
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| CN201610972527 | 2016-11-03 | ||
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019047145A1 (en) * | 2017-09-08 | 2019-03-14 | 深圳大学 | Device for fabricating optical fiber bragg grating, and fabrication method thereof |
| CN110346863A (en) * | 2018-04-04 | 2019-10-18 | 福州高意光学有限公司 | A method of FBG wavelength is controlled based on bigrating structures |
| CN110673258A (en) * | 2019-09-29 | 2020-01-10 | 北京工业大学 | System for writing various fiber gratings by ultraviolet laser mask plate method |
| CN114355503A (en) * | 2020-10-13 | 2022-04-15 | 飞巽传感技术(上海)有限公司 | Manufacturing method and system of optical fiber sensor |
| CN112526661B (en) * | 2020-12-08 | 2022-06-21 | 北京信息科技大学 | Preparation method of variable-pitch grating sensor based on electron beam exposure machine |
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| CN101009522A (en) * | 2006-12-29 | 2007-08-01 | 北京交通大学 | Control method and device for high duplication of making the optical fiber grating |
| CN101726791A (en) * | 2008-10-22 | 2010-06-09 | 中国科学院半导体研究所 | Method for producing fiber optical grating with adjustable wavelength |
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