CN100395572C - Polarization maintaining fiber apodization grating production method - Google Patents
Polarization maintaining fiber apodization grating production method Download PDFInfo
- Publication number
- CN100395572C CN100395572C CNB2007100180748A CN200710018074A CN100395572C CN 100395572 C CN100395572 C CN 100395572C CN B2007100180748 A CNB2007100180748 A CN B2007100180748A CN 200710018074 A CN200710018074 A CN 200710018074A CN 100395572 C CN100395572 C CN 100395572C
- Authority
- CN
- China
- Prior art keywords
- light
- ultraviolet light
- polarization maintaining
- grating
- zone line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention is a method for making polarization maintaining optical fiber apodized gratings, for obtaining fiber gratings with bandwidth less than 1.0nm and side lobe suppression ratio greater than 25dB, comprising the steps of: using quasi-molecular laser to generate UV light, and using flat reflector to make 90 deg parallel refraction on the UV light; then using columnar lens with radius of curvature of 101.7mm to vertically compress facula of the UV light after beam expansion; using the compressed UV light to vertically irradiate Hanning window function amplitude template and making amplitude modulation on the incident parallel UV light and obtaining a beam of UV light whose luminous flux is distributed according to the required apodized function; and finally using the phase template to expose photosensitive polarization maintaining optical fiber. And the invention mainly applies to pumping amplifiers and polarization maintaining optical fiber sensors in 860nm-1610nm wavelength range.
Description
Technical field
The present invention relates to the method for making in fiber grating field, particularly a kind of polarization maintaining fiber apodization grating.
Background technology
Fiber grating is a kind of optical fibre device, and its starting material are the optical fiber with photosensitivity, and the basic method for making of fiber grating is to adopt ultraviolet ray to the light-sensitive optical fibre exposure, makes the refractive index cyclical variation vertically of light-sensitive optical fibre.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.Though it is multiple that the method for making of existing optical fiber apodization grating has, the Sidelobe Suppression of produced grating is lower frequently, usually below 20dB.When they were applied to various optical communication device, the measurement range of its peripheral measuring equipment, precision, detection sensitivity all were subjected to certain restriction.
Summary of the invention
Problem to be solved by this invention provides a kind of Sidelobe Suppression that makes than greater than 25dB, the bandwidth method for making less than the polarization maintaining fiber apodization grating of 1.0nm.
The technical scheme that addresses the above problem is: the method for making of the polarization maintaining fiber apodization grating that is provided is carried out according to the following steps:
1) ultraviolet light that excimer laser is produced with plane mirror carries out 90 degree refractions;
2) use radius-of-curvature vertically to compress as the cylindrical lens of 101.7mm hot spot to ultraviolet light;
3) the ultraviolet light vertical irradiation after will compressing uses the amplitude template that the Hanning window function is made, and utilizes this amplitude template that the parallel ultraviolet of incident is carried out Modulation and Amplitude Modulation, obtains a branch of ultraviolet light that luminous flux distributes by required apodizing function;
4) adjust the rotation and the vergence direction of cylindrical lens, the zone line spot intensity that makes the diffraction light by phase mask is greater than the spot intensity that is positioned at the zone line both sides;
5) ultraviolet light after the modulation exposes to polarization maintaining optical fibre by phase mask.
When required grating bandwidth hour, such as bandwidth during less than 0.45nm the ultraviolet light of best birefringence expand bundle, that is: in above-mentioned steps 1) back uses the ultraviolet light parallel beam expand device, this ultraviolet light behind the birefringence expands bundle.
The window size of above-mentioned amplitude template is: high 0.2～8mm, wide 0.4～15mm;
The light inlet of above-mentioned ultraviolet light parallel beam expand device directly is 5mm, and expanding the bundle multiple is 10.
The best uniformity of zone line spot intensity of above-mentioned diffraction light by phase mask is positioned at the best uniformity of spot intensity of zone line both sides.
Advantage of the present invention is: simple for process, accuracy requirement to exposure is low, be easy to form and produce in batches, the bandwidth of made grating can be less than 1.0nm, Sidelobe Suppression ratio greater than 25dB, use reliable and stablely, help multiplexedly, 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 making schematic diagram of polarization-maintaining fiber grating of the present invention.
Fig. 2 is first kind of amplitude template figure of the present invention.
Fig. 3 is second kind of amplitude template figure of the present invention.
Fig. 4 is that the present invention modulates the optical diffraction figure of back by phase mask.
Fig. 5 is the optical grating reflection collection of illustrative plates that first embodiment of the invention obtains.
Fig. 6 is the grating transmission collection of illustrative plates that first embodiment of the invention obtains.
Fig. 7 is the optical grating reflection collection of illustrative plates that second embodiment of the invention obtains.
Fig. 8 is the grating transmission collection of illustrative plates that second embodiment of the invention obtains.
Embodiment
Below in conjunction with accompanying drawing content of the present invention is described in detail.
As shown in Figure 1, the process of making is:
1) uses KrF gas excimer laser 1 to produce the 248nm ultraviolet light, spot size is adjusted to 4mm * 6mm, and guarantee that the hot spot line parallel is in optical table by adjustable diaphragm;
2) ultraviolet light that excimer laser 1 is produced with plane mirror 2 carries out 90 degree refractions, and guarantees that refract light also is parallel to optical table;
3) this ultraviolet light that shines amplitude mode plate 5 with 3 pairs of the ultraviolet light parallel beam expand devices of 5mm * 10 times expands bundle, and the spot diameter that expands behind the bundle is 50mm;
4) use radius-of-curvature vertically to compress as the cylindrical lens of 101.7mm hot spot to ultraviolet light;
5) the ultraviolet light vertical irradiation amplitude template 5 as shown in Figure 2 after will compressing, this amplitude template use Hanning window function to be made, and its inner window is of a size of 6mm * 14mm, and external dimensions is 18mm * 20mm; Utilize this amplitude template that the parallel ultraviolet of incident is carried out Modulation and Amplitude Modulation, obtain a branch of ultraviolet light that luminous flux distributes by required apodizing function.When requiring to cut the toe symmetry, can adopt amplitude template 51 as shown in Figure 3 to carry out cutting the second time toe.
6) rotation and the vergence direction of adjustment cylindrical lens 4, make the spot intensity of zone line 21 spot intensities of the diffraction light by phase mask 6 greater than two side areas 22,23, and zone line 21 spot intensities are uniform, the spot intensity of two side areas 22,23 also is uniformly, as shown in Figure 4; Numbering 11 is 0 order diffraction light among the figure, and 12 is+1 order diffraction light, and 13 is-1 order diffraction light; Phase mask 6 can adopt existing common phase template.
6) ultraviolet light after the modulation exposes by 6 pairs of polarization maintaining optical fibres 7 of phase mask.
According to the method described above the reflection collection of illustrative plates of the polarization maintaining fiber apodization grating of Huo Deing as shown in Figure 5, its test condition is as follows: resolution is 0.05nm, sensitivity is HIGH1, mean value is 1, sampled point is 501.
As can be seen from Figure 5: centre wavelength=1549.724nm, bandwidth (FWHM)=0.403nm, Sidelobe Suppression is than (SLSR)=27.16dB.
The transmission collection of illustrative plates of this grating as shown in Figure 6, its test condition is as follows: resolution is 0.05nm, sensitivity is HIGH1, mean value is 1, sampled point is 501.
As can be seen from Figure 6: centre wavelength=1549.724nm, bandwidth=0.408nm, reflectivity=99.95%.
Embodiment 2
Connecting radius-of-curvature through the 248nm ultraviolet light direct of plane mirror 2 refraction is that the cylindrical lens of 101.7mm vertically compresses the hot spot of ultraviolet light, and all the other processes are identical with embodiment 1, and wherein the window size of amplitude template is 5mm * 11mm.Its reflection collection of illustrative plates and transmission collection of illustrative plates such as Fig. 7, shown in Figure 8.As we know from the figure, the bandwidth of grating is 0.588nm, and Sidelobe Suppression is than being 29.53dB, and centre wavelength is 1550.320nm, and reflectivity is 99.99%.
The present invention can make interior bandwidth＜1.0nm of 860nm-1610nm wavelength coverage and the polarization maintaining fiber apodization grating of Sidelobe Suppression ratio＞25dB, is mainly used in pumped amplifier and polarization maintaining optical fibre sensor etc.
Claims (7)
1. the method for making of a polarization maintaining fiber apodization grating, its step is as follows:
1) ultraviolet light that excimer laser is produced with plane mirror carries out 90 degree refractions;
2) use radius-of-curvature vertically to compress as the cylindrical lens of 101.7mm hot spot to ultraviolet light;
3) the ultraviolet light vertical irradiation after will compressing uses the amplitude template that the Hanning window function is made, and utilizes this amplitude template that the parallel ultraviolet of incident is carried out Modulation and Amplitude Modulation, obtains a branch of ultraviolet light that luminous flux distributes by required apodizing function;
4) adjust the rotation and the vergence direction of cylindrical lens, the zone line spot intensity that makes the diffraction light by phase mask is greater than the spot intensity that is positioned at the zone line both sides;
5) ultraviolet light after the modulation exposes to polarization maintaining optical fibre by phase mask.
2. preparing grating method according to claim 1 is characterized in that in above-mentioned steps 1) then use the ultraviolet light parallel beam expand device, this ultraviolet light behind the birefringence expands bundle.
3. 2 described preparing grating methods as requested is characterized in that the light inlet of said ultraviolet light parallel beam expand device directly is 5mm, and expanding the bundle multiple is 10.
4. 1,2 or 3 preparing grating method as requested is characterized in that the window size of said amplitude template is: high 0.2～8mm, wide 0.4～15mm.
5. according to claim 1,2 or 3 described preparing grating methods, it is characterized in that the zone line spot intensity of the diffraction light by phase mask is even, the spot intensity that is positioned at the zone line both sides is even.
6. according to the described preparing grating method of claim 4, it is characterized in that the zone line spot intensity of the diffraction light by phase mask is even, the spot intensity that is positioned at the zone line both sides is even.
7. according to claim 1 or 2 described preparing grating methods, it is characterized in that said excimer laser adopts KrF gas excimer laser, the ultraviolet light wavelength that is produced is 248nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100180748A CN100395572C (en) | 2007-06-18 | 2007-06-18 | Polarization maintaining fiber apodization grating production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100180748A CN100395572C (en) | 2007-06-18 | 2007-06-18 | Polarization maintaining fiber apodization grating production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101101352A CN101101352A (en) | 2008-01-09 |
| CN100395572C true CN100395572C (en) | 2008-06-18 |
Family
ID=39035713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100180748A Expired - Fee Related CN100395572C (en) | 2007-06-18 | 2007-06-18 | Polarization maintaining fiber apodization grating production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100395572C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402007B (en) * | 2011-11-29 | 2013-10-30 | 杭州恒川科技有限公司 | Negative apodization technique for fiber grating based on double-lens beam shaping |
| CN108732668B (en) * | 2018-05-04 | 2021-01-05 | 武汉理工大学 | Method for writing apodization grating with reflection spectrum shape without side lobe or weak side lobe by single laser pulse exposure |
| CN110542946B (en) * | 2018-05-28 | 2022-07-22 | 福州高意光学有限公司 | Amplitude template device and method for rapidly adjusting bandwidth of chirped fiber grating |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1105924C (en) * | 2000-06-23 | 2003-04-16 | 清华大学 | Optical fiber grating mfg. method with chirp and apodization function adjustment |
| CN1410785A (en) * | 2002-10-11 | 2003-04-16 | 东南大学 | Manufacturing method of apodization Bragg optical fibre grating having no selfcausing twitter effect |
| US6574395B1 (en) * | 1999-07-21 | 2003-06-03 | Sa Highwave Optical Technologies | Photowritten Bragg grating apodization method |
| JP2004038017A (en) * | 2002-07-05 | 2004-02-05 | Furukawa Electric Co Ltd:The | Method and device for manufacturing fiber grating |
| CN1512205A (en) * | 2002-12-31 | 2004-07-14 | 北京邮电大学 | Method for producing optic fiber grating of arbitrary wave length valve and wave length interval reflective spectrum |
| US7228017B2 (en) * | 2005-09-30 | 2007-06-05 | General Electric Company | Fiber optic sensing device and method of making and operating the same |
-
2007
- 2007-06-18 CN CNB2007100180748A patent/CN100395572C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6574395B1 (en) * | 1999-07-21 | 2003-06-03 | Sa Highwave Optical Technologies | Photowritten Bragg grating apodization method |
| CN1105924C (en) * | 2000-06-23 | 2003-04-16 | 清华大学 | Optical fiber grating mfg. method with chirp and apodization function adjustment |
| JP2004038017A (en) * | 2002-07-05 | 2004-02-05 | Furukawa Electric Co Ltd:The | Method and device for manufacturing fiber grating |
| CN1410785A (en) * | 2002-10-11 | 2003-04-16 | 东南大学 | Manufacturing method of apodization Bragg optical fibre grating having no selfcausing twitter effect |
| CN1512205A (en) * | 2002-12-31 | 2004-07-14 | 北京邮电大学 | Method for producing optic fiber grating of arbitrary wave length valve and wave length interval reflective spectrum |
| US7228017B2 (en) * | 2005-09-30 | 2007-06-05 | General Electric Company | Fiber optic sensing device and method of making and operating the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101101352A (en) | 2008-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0435201B1 (en) | Optical waveguide embedded light redirecting and focusing bragg grating arrangement | |
| CN100395572C (en) | Polarization maintaining fiber apodization grating production method | |
| CN100437168C (en) | Manufacturing method of polarization maintaining optical fiber apodization double gratings | |
| AU763596B2 (en) | Apparatus for manufacturing long-period fiber gratings and apparatus for manufacturing two-band long-period fiber gratings using the same | |
| CN1172203C (en) | Equipment and method for producing optic fibre grating | |
| KR100303284B1 (en) | Apparatus for manufacturing long period optical fiber gratings having less dependence on polarization and long period optical fiber gratings manufactured by the same | |
| CN109991699B (en) | 2 mu m wave band phase shift sampling optical fiber grating and manufacturing system and method | |
| US20020031302A1 (en) | Device for fabricating polarization insensitive long period fiber grating | |
| CN113900176B (en) | Immersed multi-core fiber grating inscribing device | |
| CN112558216A (en) | Reflection compensation type high-density multi-core fiber grating preparation system | |
| CN112255722A (en) | Novel method for preparing chirped fiber Bragg grating by means of uniform grating mask plate | |
| CN210180567U (en) | Fiber grating directional pressure sensor and fiber grating preparation device | |
| EP0383832B1 (en) | Method for measuring diameters of wires, profiles or circular parts by diffraction of light rays and device for implementing such method | |
| CN201011530Y (en) | Polarization-preserving fiber apodization optical grating | |
| US6687435B2 (en) | Optical fiber grating coder for use in optical code division multiple access, fabricating method and apparatus therefor | |
| CN113671621B (en) | Linear movable fiber bragg grating continuous inscription system and method | |
| CN201181343Y (en) | Apparatus for long period optical fiber optical grating ultraviolet laser point-to-point write-in method | |
| Caucheteur et al. | Transverse force sensor exploiting the birefringence effect in uniform fibre Bragg gratings | |
| KR100525206B1 (en) | Apparatus and method of measuring temperature and strain using a single Fiber Bragg Grating | |
| CN112326581A (en) | Novel double-beam water quality multi-parameter testing device | |
| RU2690230C1 (en) | Method of forming array of bragg fiber gratings with different reflection wavelengths | |
| US7006537B2 (en) | Single polarization fiber laser | |
| CN105988153A (en) | Device and method of fabricating apodization phase shift grating on tapered fiber | |
| CN101261340B (en) | Preparation method of high coding efficiency optical encoder adapting to different wavelength | |
| CN201107424Y (en) | Polarization-preserving fiber apodizing double grating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080618 Termination date: 20160618 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |