CN101726791A - Method for producing fiber optical grating with adjustable wavelength - Google Patents
Method for producing fiber optical grating with adjustable wavelength Download PDFInfo
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- CN101726791A CN101726791A CN200810224822A CN200810224822A CN101726791A CN 101726791 A CN101726791 A CN 101726791A CN 200810224822 A CN200810224822 A CN 200810224822A CN 200810224822 A CN200810224822 A CN 200810224822A CN 101726791 A CN101726791 A CN 101726791A
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Abstract
The invention discloses a method for producing a fiber optical grating with an adjustable wavelength, which comprises the steps of: leading ultraviolet light to enter into a lens group with adjustable focal distance through a diaphragm; adjusting the assembly of each lens in the lens group to obtain convergent light beams, divergent light beams or parallel light beams with different divergent angles; and leading the convergent light beams, the divergent light beams or the parallel light beams with the different divergent angles to be irradiated on the fiber to complete the production of the fiber optical grating. The method overcomes the limitation that the wavelength only can be adjusted on a short-wave direction by means of prestressing, can realize the adjustment on the long wave direction and the short wave direction, and can produce the fiber optical gratings with various wavelengths.
Description
Technical field
The present invention relates to the fiber grating manufacture technology field, relate in particular to a kind of method of making the fiber grating of wavelength-tunable, this method adopts phase mask to make fiber grating, can produce the combination of any one or at least two kinds in Bragg grating, phase-shifted grating, apodization grating and the oblique raster.
Background technology
Make the field at fiber grating, there are stationary point wrting method, horizontal interferometric method, phase mask method (Hill K O, Malo B, et al.Applied physical letter, 1993, vol (62), page:1035～1037) many technology such as, adopting phase mask to make fiber grating has become present main flow.The key of this method is to use a phase mask, this phase mask be one on quartzy silicon substrate the cycle of scribing into be Λ phase grating.When the ultraviolet light vertical irradiation was to phase mask, just the cycle of cutting out was the fiber grating of Λ/2 near the optical fiber of phase mask back, and the wavelength X of fiber grating equals the effective refractive index n of fiber grating
EffProduct with Λ.
Because the cycle of phase mask is fixed, so if do not add other measure, then the wavelength of the fiber grating of Zhi Zuoing is also fixed.In order to obtain the fiber grating of different wave length, just need to change the parameter n of decision optic fiber grating wavelength
EffThe perhaps value of Λ.Extensively adopt the method for prestress to change periods lambda at present.The characteristics of this method are when making fiber grating, apply pulling force for the optical fiber two ends optical fiber is extended, and at back this pulling force of removal that completes, the cycle of grating diminishes along with the recovery of optical fiber, thereby reach the purpose that changes optic fiber grating wavelength.Though this method is simple and practical, because prestress can not be excessive, so this method wavelength regulation scope is certain, and this method can only realize the wavelength regulation to the shortwave direction.
Also have in addition and adopt the method that changes optical fiber and phase mask distance to make fiber grating with different wave length, this method requires the coherent length of ultraviolet light to be greater than the spacing of optical fiber and phase mask, otherwise just can't obtain high-quality fiber grating, the coherent length of present ultraviolet light is generally in hundred micron dimensions, so the feasibility of this method is not high.
Summary of the invention
(1) technical matters that will solve
In view of this, fundamental purpose of the present invention is to provide a kind of method of making the fiber grating of wavelength-tunable, to produce the fiber grating of various wavelength.
(2) technical scheme
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of method of making the fiber grating of wavelength-tunable, this method comprises:
Ultraviolet light is entered a lens group with adjustable focal distance through diaphragm;
Regulate the combination of each lens in this lens combination, obtain having convergent beam, divergent beams or the parallel beam of the different angles of divergence;
The convergent beam, divergent beams or the parallel beam that obtain having the different angles of divergence are radiated on the optical fiber through phase mask, finish fiber grating and make.
In the such scheme, the lens in this lens combination are ultraviolet divergence lens or convergent lens.
In the such scheme, the quantity of the lens in this lens combination is at least one.
In the such scheme, this ultraviolet light is launched by excimer laser.
In the such scheme, the type of this optical fiber is a light-sensitive optical fibre, or the optical fiber of handling through enhanced sensitivity.
In the such scheme, the type of this fiber grating is any one in Bragg grating, phase-shifted grating, apodization grating and the oblique raster, or both combinations at least in Bragg grating, phase-shifted grating, apodization grating and the oblique raster.
(3) beneficial effect
The invention has the advantages that, overcome and adopted the prestress method can realize adjusting, can produce the fiber grating of various wavelength to the restriction of shortwave direction adjusting to long wave and shortwave twocouese.In addition, with adopting change optical fiber to compare with the method that the method for phase mask distance is made the fiber grating with different wave length, the yield rate and the quality of the fiber grating that employing the present invention makes are higher.
Description of drawings
For further specifying concrete technology contents of the present invention, below in conjunction with example and accompanying drawing the present invention is done a detailed description, wherein:
Fig. 1 is the method flow diagram of the fiber grating of making wavelength-tunable provided by the invention;
Fig. 2 adopts phase mask to make the synoptic diagram of fiber grating according to the embodiment of the invention;
Among the figure: 1 is excimer laser, and 2 and 5 is ultraviolet light, and 3 is diaphragm, and 4 is lens combination, and 6 is phase mask, and 7 is optical fiber, and 8 and 9 are respectively positive one and negative first-order diffraction ultraviolet light.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Please refer to Fig. 1, Fig. 1 is the method flow diagram of the fiber grating of making wavelength-tunable provided by the invention, and this method may further comprise the steps:
Step 101: ultraviolet light is entered a lens group with adjustable focal distance through diaphragm;
Step 102: regulate the combination of each lens in this lens combination, obtain having convergent beam, divergent beams or the parallel beam of the different angles of divergence;
Step 103: convergent beam, divergent beams or the parallel beam that will obtain having the different angles of divergence are radiated on the optical fiber through phase mask, finish fiber grating and make.
Please refer to Fig. 2, Fig. 2 adopts phase mask to make the synoptic diagram of fiber grating according to the embodiment of the invention, and embodiment specifically may further comprise the steps:
Step 1: krypton fluoride excimer laser 1 is launched the ultraviolet light 2 of 248nm, and ultraviolet light 2 enters lens combination 4 through diaphragm 3, and diaphragm 3 is used for limiting the size of incident light 1, and getting aperture stop size is 1.8cm.
Step 2: lens combination 4 is made up of two fused quartz convex lens 4a and 4b, and their focal length is respectively 12.2cm and 21.5cm, can obtain having the light path of dispersing of the different angles of divergence by the spacing that changes both, assembles light path or parallel light path.Getting spacing is 33.7cm, when 46.42cm and 59.13cm, obtains angle and be 0 parallel beam, and angle is 5 degree and 10 divergent beams of spending.Wherein lens can adopt ultraviolet divergence lens or convergent lens, and the minimum number of lens is one in combination of lenses.
Step 3: be radiated on the phase mask 6 (cycle of phase mask is 1058.3nm) with periodic structure through the ultraviolet light beam after the lens combination 45, thereby produce positive first-order diffraction light 8 and negative first-order diffraction light 9, two bundle diffraction lights interfere the sinusoidal pattern light distribution of formation along optical fiber 7 directions, optical fiber 7 is common communications optical fiber, warp year hydrogen is handled and is increased its photosensitivity, in light intensity is under the irradiation of the ultraviolet light that distributes of sinusoidal pattern, the refractive index of optical fiber 7 also presents same Sine distribution, has so just formed bragg grating.Under the divergent beams irradiation, the wavelength of fiber grating is regulated to the long wave direction, and the regulated quantity and the angle of wavelength are directly proportional, and their centre wavelength is followed successively by 1526.54nm, 1527.05nm and 1527.35nm.If adopt convergent beam, the wavelength of fiber grating will be regulated to the shortwave direction, and the regulated quantity and the angle of same wavelength are directly proportional.Wherein optical fiber can be light-sensitive optical fibre or the optical fiber handled through enhanced sensitivity, the type of the fiber grating of making can be any one in Bragg grating, phase-shifted grating, apodization grating and the oblique raster, also can be both combinations at least in Bragg grating, phase-shifted grating, apodization grating and the oblique raster.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a method of making the fiber grating of wavelength-tunable is characterized in that, this method comprises:
Ultraviolet light is entered a lens group with adjustable focal distance through diaphragm;
Regulate the combination of each lens in this lens combination, obtain having convergent beam, divergent beams or the parallel beam of the different angles of divergence;
The convergent beam, divergent beams or the parallel beam that obtain having the different angles of divergence are radiated on the optical fiber through phase mask, finish fiber grating and make.
2. the method for the fiber grating of making wavelength-tunable according to claim 1 is characterized in that, the lens in this lens combination are ultraviolet divergence lens or convergent lens.
3. the method for the fiber grating of making wavelength-tunable according to claim 1 is characterized in that, the quantity of the lens in this lens combination is at least one.
4. the method for the fiber grating of making wavelength-tunable according to claim 1 is characterized in that, this ultraviolet light is launched by excimer laser.
5. the method for the fiber grating of making wavelength-tunable according to claim 1 is characterized in that, the type of this optical fiber is a light-sensitive optical fibre, or the optical fiber of handling through enhanced sensitivity.
6. the method for the fiber grating of making wavelength-tunable according to claim 1, it is characterized in that, the type of this fiber grating is any one in Bragg grating, phase-shifted grating, apodization grating and the oblique raster, or both combinations at least in Bragg grating, phase-shifted grating, apodization grating and the oblique raster.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810224822A CN101726791A (en) | 2008-10-22 | 2008-10-22 | Method for producing fiber optical grating with adjustable wavelength |
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| CN200810224822A CN101726791A (en) | 2008-10-22 | 2008-10-22 | Method for producing fiber optical grating with adjustable wavelength |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616741A (en) * | 2013-12-07 | 2014-03-05 | 山东海富光子科技股份有限公司 | Device for preparing intermediate infrared fiber bragg grating |
| CN106289088A (en) * | 2016-07-27 | 2017-01-04 | 四川大学 | It is applied to the compensation strain testing method of engineering material |
| CN106646708A (en) * | 2016-11-03 | 2017-05-10 | 北京信息科技大学 | Pre-inscribing-based accurate FBG wavelength inscribing method |
| CN107884871A (en) * | 2017-11-13 | 2018-04-06 | 西安石油大学 | The Written Device of visible light wave range fiber grating |
| CN108445581A (en) * | 2018-01-29 | 2018-08-24 | 江苏深光通信科技有限公司 | Generate the method and its production method of wide spectrum low noise antiradar reflectivity fiber grating |
| CN109270614A (en) * | 2018-11-02 | 2019-01-25 | 南京理工大学 | A kind of production method of tandem type polymorphic type nonlinear effect suppressive oblique raster |
-
2008
- 2008-10-22 CN CN200810224822A patent/CN101726791A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616741A (en) * | 2013-12-07 | 2014-03-05 | 山东海富光子科技股份有限公司 | Device for preparing intermediate infrared fiber bragg grating |
| CN106289088A (en) * | 2016-07-27 | 2017-01-04 | 四川大学 | It is applied to the compensation strain testing method of engineering material |
| CN106646708A (en) * | 2016-11-03 | 2017-05-10 | 北京信息科技大学 | Pre-inscribing-based accurate FBG wavelength inscribing method |
| CN106646708B (en) * | 2016-11-03 | 2018-11-23 | 北京信息科技大学 | It is a kind of based on the accurate carving and writing method of FBG wavelength inscribed in advance |
| CN107884871A (en) * | 2017-11-13 | 2018-04-06 | 西安石油大学 | The Written Device of visible light wave range fiber grating |
| CN108445581A (en) * | 2018-01-29 | 2018-08-24 | 江苏深光通信科技有限公司 | Generate the method and its production method of wide spectrum low noise antiradar reflectivity fiber grating |
| CN109270614A (en) * | 2018-11-02 | 2019-01-25 | 南京理工大学 | A kind of production method of tandem type polymorphic type nonlinear effect suppressive oblique raster |
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Open date: 20100609 |