CN201011530Y - Polarization-preserving fiber apodization optical grating - Google Patents
Polarization-preserving fiber apodization optical grating Download PDFInfo
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- CN201011530Y CN201011530Y CNU2007200320594U CN200720032059U CN201011530Y CN 201011530 Y CN201011530 Y CN 201011530Y CN U2007200320594 U CNU2007200320594 U CN U2007200320594U CN 200720032059 U CN200720032059 U CN 200720032059U CN 201011530 Y CN201011530 Y CN 201011530Y
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Abstract
The utility model relates to a polarization preserving optical fiber apodization raster whose fiber core surface is provided with a raster groove, which is characterized in that the width of the raster groove satisfying the raster is smaller than 1.0nm and the side lobe restriction ratio is equal to or bigger than 25dB. The utility model is mainly used in the pumping amplifiers or polarization preserving optical fiber transducers whose wavelength scopes ranges from 860nm to 1610nm.
Description
Technical field
The utility model relates to the fiber grating field, particularly a kind of polarization maintaining fiber apodization grating.
Background technology
Fiber grating is a kind of optical fibre device, its starting material are the optical fiber with photosensitivity, the basic method for making of fiber grating is to adopt ultraviolet ray that light-sensitive optical fibre is exposed, form a rule groove on the surface of fiber core, make the refractive index cyclical variation vertically of light-sensitive optical fibre, this light-sensitive optical fibre with refractive index cycle variation structure just is called fiber grating, and the shape of glazing bar, the performance that structure is directly determining grating are deleted in the fiber core surface.
There is bigger refringence between common fiber grating two ends and its tail optical fiber, this refractive index missionary society causes end face reflection, and the existence of end face reflection can have a strong impact on the performance of fiber grating, it reduces the side mode suppression ratio of reflection type optical fiber grating such as gratings such as Fiber Bragg Grating FBG, chirped fiber grating, make the dispersion curve of chirped fiber grating have bigger vibration, make the transmission-type fiber grating, the little transmission peaks of series occurs as long period fiber grating transmission main peak both sides.For improving the fiber grating performance, must cut toe to grating, the grating index variable quantity is become to the centre greatly by the grating two ends by certain apodizing function gradually along optical grating axial, reducing the refringence between grating end face and its tail optical fiber, thereby reduce the end face reflection of grating.Because various reasons such as technologies, the structure of present polarization maintaining fiber apodization grating also comes with some shortcomings, and its Sidelobe Suppression is lower frequently.
Summary of the invention
Problem to be solved in the utility model provides a kind of Sidelobe Suppression than the polarization maintaining fiber apodization grating greater than 25dB.
The technical scheme that addresses the above problem is: the fibre core surface of the polarization maintaining fiber apodization grating that is provided has linear grating groove, special feature of the present utility model be said linear grating groove satisfy this grating bandwidth less than 1.0nm, Sidelobe Suppression is than greater than 25dB.
The Sidelobe Suppression ratio of above-mentioned grating can be 25～30dB.
Compare with existing polarization maintaining fiber apodization grating, the advantage of polarization maintaining fiber apodization grating provided by the utility model is: use reliable and stable, help multiplexed, be convenient to constitute the Fibre Optical Sensor of various ways, especially the distributed fiber grating sensor array that adopts wavelength-division multiplex technique to constitute can carry out large-area multimetering.
Description of drawings
Fig. 1 is the structure enlarged diagram of polarization maintaining fiber apodization grating of the present utility model.
Fig. 2 is a manufacturing schematic diagram of the present utility model.
Fig. 3 is a reflection collection of illustrative plates of the present utility model.
Embodiment
Below in conjunction with accompanying drawing content of the present utility model is illustrated.
As shown in Figure 1.Polarization maintaining fiber apodization grating of the present utility model is made up of skin 11 and fibre core 12, the outside surface of fibre core 12 has a series of lateral trench 13, wherein central groove 14 is the darkest, and other groove is that middle mind-set both sides are symmetrically distributed with central groove 14, and gash depth reduces successively.
Polarization maintaining fiber apodization grating of the present utility model adopts the ultraviolet photoetching method to obtain, and its principle as shown in Figure 2.The process of making is: use KrF gas excimer laser 1 to produce ultraviolet light, carry out the parallel refraction of 90 degree by 2 pairs of these ultraviolet lights of plane mirror, use 3 pairs of these ultraviolet lights of ultraviolet light parallel beam expand device of 5 * 10 to expand bundle then, the spot diameter that expands behind the bundle is 50mm; The 4 pairs of hot spots that expand the ultraviolet light after restrainting of cylindrical lens that re-use radius-of-curvature 101.7mm vertically compress, utilize the ultraviolet light vertical irradiation Hanning window functions amplitude template 5 after compressing, the incident parallel ultraviolet is carried out Modulation and Amplitude Modulation, obtain a branch of ultraviolet light that luminous flux distributes by required apodizing function (being the Hanning window function); Expose by 6 pairs of photosensitive polarization maintaining optical fibres 7 of phase mask at last, can obtain fiber grating of the present utility model.
When bandwidth is big, during for example greater than 0.45nm, undertaken can expanding bundle after the parallel refraction of 90 degree by 2 pairs of these ultraviolet lights of plane mirror, directly the hot spot by cylindrical lens 4 ultraviolet lights vertically compresses.
The applicant by said method obtain bandwidth 0.403nm, Sidelobe Suppression than for the reflection collection of illustrative plates of the polarization maintaining fiber apodization grating of 27.16dB as shown in Figure 3.Test condition is: resolution 0.05nm, and sensitivity HIGH1 (testing apparatus ANDO6317B), mean value: 1, sampled point: 501.The centre wavelength of grating is 1549.724nm.
Claims (2)
1. polarization maintaining fiber apodization grating, its fibre core surface has the horizontal raster groove, the central groove (14) that it is characterized in that said horizontal raster groove is the darkest, other groove is that middle mind-set both sides are symmetrically distributed with central groove (14), gash depth reduces successively, the bandwidth of this horizontal raster is less than 1.0nm, and the Sidelobe Suppression ratio is equal to or greater than 25dB.
2. grating according to claim 1 is characterized in that the Sidelobe Suppression ratio of this grating is 25～30dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200320594U CN201011530Y (en) | 2007-06-18 | 2007-06-18 | Polarization-preserving fiber apodization optical grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200320594U CN201011530Y (en) | 2007-06-18 | 2007-06-18 | Polarization-preserving fiber apodization optical grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201011530Y true CN201011530Y (en) | 2008-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200320594U Expired - Fee Related CN201011530Y (en) | 2007-06-18 | 2007-06-18 | Polarization-preserving fiber apodization optical grating |
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| CN (1) | CN201011530Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459367A (en) * | 2018-02-27 | 2018-08-28 | 封建胜 | High contrast chirp body grating and its control method for improving chirped pulse contrast |
-
2007
- 2007-06-18 CN CNU2007200320594U patent/CN201011530Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459367A (en) * | 2018-02-27 | 2018-08-28 | 封建胜 | High contrast chirp body grating and its control method for improving chirped pulse contrast |
| CN108459367B (en) * | 2018-02-27 | 2021-12-17 | 封建胜 | High-contrast chirped grating and control method for improving chirped pulse contrast |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080123 Termination date: 20160618 |