CN109683231A - Mechanical chirp long period optic fiber grating - Google Patents
Mechanical chirp long period optic fiber grating Download PDFInfo
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- CN109683231A CN109683231A CN201910014446.2A CN201910014446A CN109683231A CN 109683231 A CN109683231 A CN 109683231A CN 201910014446 A CN201910014446 A CN 201910014446A CN 109683231 A CN109683231 A CN 109683231A
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- type groove
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- 239000000835 fiber Substances 0.000 title claims abstract description 35
- 239000013307 optical fiber Substances 0.000 claims abstract description 30
- 238000005452 bending Methods 0.000 claims abstract description 12
- 238000000411 transmission spectrum Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 17
- 230000008859 change Effects 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 230000004044 response Effects 0.000 description 1
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- 230000001953 sensory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
A kind of mechanical chirp long period optic fiber grating, including force application apparatus, upper metal platen, lower metal firm banking, the force application apparatus is that any one can provide the device of mechanical pressure, the upper metal platen, which has, sets periodicity N, fixed cycle size as the V-groove of Λ, the lower metal firm banking has the U-type groove of different curvature radius, and optical fiber, which is fixed in the U-type groove, keeps the optical fiber with certain curvature radius R bending.That the invention proposes a kind of structures is simple, easy to make, the good mechanical chirp long period optic fiber grating of repeatability.
Description
Technical field
The present invention relates to sensory field of optic fibre, the communications field and fiber grating preparation field, especially a kind of mechanical chirp
Long-period fiber grating.
Technical background
Chirp long period optic fiber grating (CLPFG) is a kind of long period light of specific type that the period changes in optical fiber axial direction
Fine grating (LPFG).Relative to common LPFG, CLPFG is since it is with may be implemented more waves in wider bandwidth, transmission spectrum
It is long with resistance, suitable for the characteristic of multi-wavelength filtering, there is very big competitive advantage in the communications field.In practical communication application
In, CLPFG both can be used as EDFA gain smoothing filter, can also cascade as wavelength-division multiplex separation filter.In addition,
CLPFG is sensitive to the variation response of external environment (pressure, temperature, refractive index), also has preferable hair in terms of sensing measurement
Exhibition prospect.
The working principle of chirp long period optic fiber grating (CLPFG) is identical as long-period fiber grating (LPFG), passes through fibre
The coupling of the cladding mode of core guided mode and symport, being coupled to the guided mode for meeting phase-matching condition in covering becomes in optical fiber
Radiation mode to escape fall, realize filter function.Cross-coupling constant k by changing CLFPG can be realized CLFPG in band
Conversion between bandpass filter and bandstop filter.
Common method currently used for making CLPFG is aperiodicity amplitude mask means.It shakes using through aperiodicity
CLPFG is written to hydrogen optical fiber is carried with certain energy exposure in the ultraviolet light of width mask plate.The production method have with it is outer loss it is small,
And the feature that performance is stable.But it needs to make annealing treatment it after completing, causes Production Time long, cost of manufacture is high.
Also have and laser is focused into light beam less than screen periods, then fibre movement displacement is controlled by precision electric motor, every a week
Phase carries out single exposure and CLPFG is written.This method has the advantages that manufacturing process is flexible, but the precision of its mechanical displacement is difficult to control
System, while it is high for the focusing requirement of laser.Ion implantation is also a kind of effective ways for making CLPFG, it will add
High-energy He after speed2+Particle forms CLPFG by aperiodicity metal mask plate injection fibre.
The production mechanism of CLPFG will cause not optical fiber in preparing grating based on optical fiber generation chemical change at present
Reversible influence can not realize the recycling of optical fiber, while long, manufacturing conditions require the disadvantages of high there is also Production Time.
The production technology of CLPFG there are still it is biggish can room for improvement.
Summary of the invention
In order to overcome, existing chirp long period optic fiber grating making apparatus is complicated, production is difficult, repeatability is poor not
Foot, the invention proposes a kind of production simply, conveniently, the good mechanical chirp long period optic fiber grating of repeatability.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of mechanical chirp long period optic fiber grating, including force application apparatus, top board and lower firm banking, the force
Device be it is any the device of mechanical pressure can be provided, the top board have set periodicity N, fixed cycle size as
The V-groove (sawtooth) of Λ, the lower firm banking have the U-type groove of different curvature radius, and optical fiber, which is fixed in the U-type groove, to be made
The optical fiber is kept with certain curvature radius R bending.
Further, the U-type groove includes the U-type groove of different radii R.
Further, the U-type groove includes same radius R, the U-type groove of different length.
The variation of screen periods is determined by the variable angle of curved fiber and top board V-groove.Assuming that grating adjacent position
Variable angle beSo corresponding chirp coefficient isIts
Middle l is the grating length in corresponding period.It can be seen that i-th (i≤N) a week of the mechanical chirp long period optic fiber grating
Phase are as follows:
CLPFG transmission spectrum bandwidth is from λ1~λN, wherein λ1Corresponding screen periods are Λ1Resonance wavelength ... λNCorresponding grating
Period is ΛNResonance wavelength.
Technical concept of the invention are as follows: CLPFG is different from LFPG, and screen periods are not constants, and change rate is by chirp system
Number C determines that chirp coefficient indicates screen periods with the variation of CLPFG unit length.CLPFG can be regarded as N in the present invention
The superposition of the LPFG of a different cycles, to realize the filtering of wide spectrum.The variation of CLPFG screen periods by curved fiber with it is upper
The variable angle of pressing plate V-groove determines.Assuming that the variable angle of grating adjacent position isSo corresponding to chirp coefficient isWherein l is corresponding week
The grating length of phase.It can be seen that i-th of period (i≤N) of CLPFG are as follows:
The transmission spectrum bandwidth of CLPFG is from λ1~λN, wherein λ1Corresponding screen periods are Λ1Resonance wavelength ... λNCorresponding light
Grid cycle is ΛNResonance wavelength, to realize the filter effect of wide spectrum.The present invention can pass through the bending radius of change optical fiber
R changes the chirp coefficient of CLPFG, realizes the production of same period number, different chirp coefficient CLPFG, obtains different cake resistancets
It is wide.Meanwhile the present invention can change the periodicity N of CLPFG by the variation of fiber lengths, realize different cycles number, same to chirp
The production of coefficient CLPFG obtains the control to CLPFG filtration efficiency.
The present invention is to generate CLPFG by the position stress of chirped fiber by optical fiber in conjunction with mechanical structure.
Beneficial effects of the present invention are mainly manifested in: 1) after chirp long period optic fiber grating completes at present, Bu Nengzai
Change its chirped grating coefficient, the mechanical chirp long period optic fiber grating in the present invention has well solved this problem.It is logical
Cross different fibre-optical bendings, the angle consecutive variations of optical fiber and top board periodic serrations, to realize different chirp coefficients
CLPFG.2) in same bending radius, change the stressed length of optical fiber, grating week when the present invention is able to achieve same chirp coefficient
The variation of issue.3) it is different from general CLPFG production method, the present invention makes grating with mechanical pressure, can be big by pressure
Small control filter effect, and same optical fiber can be suppressed repeatedly, realize the recycling of optical fiber.4) of the invention another excellent
Point is that manufacturing process is flexible and convenient, and Production Time is short, and controllability is strong.
Detailed description of the invention
Fig. 1 is that the lower firm banking of mechanical chirp long period optic fiber grating preparation and zigzag top board structure are shown
It is intended to.
Fig. 2 is mechanical chirp long period optic fiber grating specific works schematic diagram.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Figures 1 and 2, a kind of mechanical chirp long period optic fiber grating, including force application apparatus, top board 2 and lower solid
Determine pedestal 1, the force application apparatus is that any one can provide the device of mechanical pressure 5, and the top board 2 has the setting period
Number N, the V-groove that fixed cycle size is Λ, the lower firm banking 1 include the U-type groove of different curvature radius and length, optical fiber
It is fixed in the U-type groove and the optical fiber is kept with certain curvature radius R bending.
In the present embodiment, 1 is lower firm banking (U-type groove), for fixing fibre-optical bending and ensureing steady in manufacturing process
It is qualitative.2 be top board (V-groove), is periodically variable serrated plate, for providing stable pressure.3 be lower fixed bottom
The U-type groove of seat different radii R, each U-type groove effect is fixed optical fiber, and optical fiber is made to keep the curved of certain curvature in the production process
Song, to change the period size of corresponding position.The different radius of curvature of optical fiber corresponds to the different chirp coefficient of CLPFG, i.e., not
When with radius of curvature, the period at same V-groove is of different sizes.CLPFG is realized not by adjusting the bending radius of optical fiber
With filtering spectrum width.4 be the U-type groove that radius R is identical, length is different in lower firm banking, the U-type groove that can be put by changing optical fiber
To control the periodicity N of CLPFG.5 be force application apparatus to the mechanical pressure of pressing plate, controls CLPFG by control pressure size
Coupling efficiency, realize different filtering losses.
Fig. 2 is the operation schematic diagram of mechanical CLPFG.The broadband optical signal such as 9 is generated by wideband light source BBS 6, is passed
It is input among single mode optical fiber.7 indicate the CLPFG realized with mechanical structure, and it is U-shaped that fibre-optical bending is fixed on lower firm banking
In slot, the radius of curvature R of fibre-optical bending determines the periods lambda of made gratingi.Optical fiber is applied by zigzag top board
Pressure makes fibre core, the cladding index variation of optical fiber different location, realizes that the fiber core guided mode for meeting wavelength condition is coupled to radiation
Enter covering in mould, the light for being unsatisfactory for wavelength condition is still transmitted along fiber core.CLPFG can be regarded as by N number of uniform
LPFG composition, filtering characteristic meetDisplay transmission signal is received by spectroanalysis instrument 8,
10 be a kind of ideal wide spectrum filter effect.It can control by controlling the U-type groove that different fiber bending radius and optical fiber are placed
The chirp coefficient and periodicity N of CLPFG, to realize the wide spectrum filtering of different demands.
Claims (4)
1. a kind of mechanical chirp long period optic fiber grating, which is characterized in that including force application apparatus, top board and lower fixed bottom
Seat, the force application apparatus be it is any the device of mechanical pressure can be provided, the top board has setting periodicity N, solid
Fixed cycle size is the V-groove of Λ, and the lower firm banking has the U-type groove of different curvature radius, and optical fiber is fixed on the U-type groove
The optical fiber is kept with certain curvature radius R bending.
2. mechanical chirp long period optic fiber grating as described in claim 1, which is characterized in that the U-type groove includes difference
The U-type groove of radius R.
3. mechanical chirp long period optic fiber grating as claimed in claim 1 or 2, which is characterized in that the U-type groove includes phase
With radius R, the U-type groove of different length.
4. mechanical chirp long period optic fiber grating as described in claim 1, which is characterized in that the variation of screen periods is by curved
The variable angle of bent optical fiber and top board V-groove determines.Assuming that the variable angle of grating adjacent position isSo corresponding chirp coefficient isWherein l is corresponding week
The grating length of phase.It can be seen that i-th (i≤N) a period of the mechanical chirp long period optic fiber grating are as follows:
CLPFG transmission spectrum bandwidth is from λ1~λN, wherein λ1Corresponding screen periods are Λ1Resonance wavelength ... λNCorresponding screen periods
For ΛNResonance wavelength.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910014446.2A CN109683231A (en) | 2019-01-07 | 2019-01-07 | Mechanical chirp long period optic fiber grating |
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| CN201910014446.2A CN109683231A (en) | 2019-01-07 | 2019-01-07 | Mechanical chirp long period optic fiber grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320590A (en) * | 2019-05-17 | 2019-10-11 | 浙江工业大学 | A kind of production method of machinery chirp long period optic fiber grating |
| CN113009618A (en) * | 2021-03-23 | 2021-06-22 | 吉林大学 | Method for preparing chirped fiber grating by femtosecond laser direct writing technology |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6282341B1 (en) * | 1998-12-22 | 2001-08-28 | The Board Of Trustees Of The Leland Stanford Junior University | Tunable, mechanically induced long-period fiber grating with enhanced polarizing characteristics |
| US6788851B1 (en) * | 2003-07-01 | 2004-09-07 | 3M Innovative Properties Company | Apparatus and method for adjusting the spectral response of an optical waveguide grating |
| CN101251615A (en) * | 2008-03-31 | 2008-08-27 | 山东大学 | Multiple channel tuned long period optical fiber grating filter |
| US20080240174A1 (en) * | 2007-03-27 | 2008-10-02 | Brueck Steven R J | Tunable infrared lasers for gas-phase spectroscopy |
| CN209590327U (en) * | 2019-01-07 | 2019-11-05 | 浙江工业大学 | Mechanical chirp long period optic fiber grating |
-
2019
- 2019-01-07 CN CN201910014446.2A patent/CN109683231A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6282341B1 (en) * | 1998-12-22 | 2001-08-28 | The Board Of Trustees Of The Leland Stanford Junior University | Tunable, mechanically induced long-period fiber grating with enhanced polarizing characteristics |
| US6788851B1 (en) * | 2003-07-01 | 2004-09-07 | 3M Innovative Properties Company | Apparatus and method for adjusting the spectral response of an optical waveguide grating |
| US20080240174A1 (en) * | 2007-03-27 | 2008-10-02 | Brueck Steven R J | Tunable infrared lasers for gas-phase spectroscopy |
| CN101251615A (en) * | 2008-03-31 | 2008-08-27 | 山东大学 | Multiple channel tuned long period optical fiber grating filter |
| CN209590327U (en) * | 2019-01-07 | 2019-11-05 | 浙江工业大学 | Mechanical chirp long period optic fiber grating |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320590A (en) * | 2019-05-17 | 2019-10-11 | 浙江工业大学 | A kind of production method of machinery chirp long period optic fiber grating |
| CN113009618A (en) * | 2021-03-23 | 2021-06-22 | 吉林大学 | Method for preparing chirped fiber grating by femtosecond laser direct writing technology |
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