CN100437168C - Manufacturing method of polarization maintaining optical fiber apodization double gratings - Google Patents
Manufacturing method of polarization maintaining optical fiber apodization double gratings Download PDFInfo
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- CN100437168C CN100437168C CNB2007101884993A CN200710188499A CN100437168C CN 100437168 C CN100437168 C CN 100437168C CN B2007101884993 A CNB2007101884993 A CN B2007101884993A CN 200710188499 A CN200710188499 A CN 200710188499A CN 100437168 C CN100437168 C CN 100437168C
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- ultraviolet light
- grating
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- optical fiber
- maintaining optical
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Abstract
The invention relates to a production method of polarization maintaining optical fiber toe cutting double grating so as to obtain the polarization maintaining optical fiber toe cutting double grating, the band width of which is smaller than 1.5nm and side lobe suppression rate is bigger than 20dB. The main steps are that: an excimer laser generates an ultraviolet light and refracts with 90 DEG to the ultraviolet light through a plane mirror; then the ultraviolet light after being refracted vertically irradiates gauss windows, hanning windows, hamming windows or blackman windows function swing template, adjust the swing to the irradiated inlet parallel ultraviolet light and obtain one beam of ultraviolet light, the luminous flux fo which is distributed according to the toe cutting function; the cylinder, ,the curvature radius of which is 10. 2 to 508. 6 mm vertically compresses the facula of the ultraviolet light being adjusted; finally the photosensitive polarization maintaining optical fiber is solarized through a phase template. The invention mainly used for a pumping amplifier, the wavelength of which is 850nm to 1650nm and polarization maintaining optical fiber sensors, etc.
Description
Technical field
The present invention relates to the method for making in fiber grating field, particularly a kind of polarization maintaining optical fiber apodization double gratings.
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 20dB, the bandwidth method for making less than the polarization maintaining optical fiber apodization double gratings of 1.5nm.
The technical scheme that addresses the above problem is: the method for making of the polarization maintaining optical fiber apodization double gratings 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, and guarantees that refract light is parallel to optical table;
2) the ultraviolet light vertical irradiation after will reflecting uses the amplitude template that a kind of function in Gaussian window, Hanning window, Hamming window or the Blackman window is made, 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;
3) use radius-of-curvature vertically to compress as the cylindrical lens of 10.2-508.6mm hot spot to ultraviolet light;
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, forms first grating;
6) apart from first grating 〉=5mm place by above 1) to 5) and step write second grating.
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 0.2～15mm, wide 0.4～50mm;
The light inlet of above-mentioned ultraviolet light parallel beam expand device directly is 4-10mm, and expanding the bundle multiple is 2-10.
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, and low to the accuracy requirement of exposure, be easy to form and produce in batches, the bandwidth of made double grating can be less than 1.5nm, Sidelobe Suppression ratio greater than 20dB, and usability is reliable and stable.
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 an optical grating construction synoptic diagram of the present invention.
Fig. 6 is the optical grating reflection collection of illustrative plates that first embodiment of the invention obtains.
Fig. 7 is the grating transmission collection of illustrative plates that first embodiment of the invention obtains.
Fig. 8 is the optical grating reflection collection of illustrative plates that second embodiment of the invention obtains.
Fig. 9 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) be that this ultraviolet light that 3 pairs of the ultraviolet light parallel beam expand devices of BXUV-4.0-10X-225-308 shine amplitude mode plate 5 expands bundle with model, the spot diameter that expands behind the bundle is 40mm;
4) will expand ultraviolet light vertical irradiation amplitude template 5 as shown in Figure 2 behind the bundle, this amplitude template uses Gaussian window function to be made, and its inner window is of a size of 0.2mm * 0.4mm, 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.
5) use radius-of-curvature vertically to compress as the hot spot of 4 pairs of ultraviolet lights of cylindrical lens of 101.7mm;
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.
7) ultraviolet light after the modulation is by 6 pairs of polarization maintaining optical fibres 7 of phase mask formation grating that exposes.
8) apart from this grating 〉=5mm place by above 1) to 7) and step write second grating.
Resulting double grating as shown in Figure 5.
According to the method described above the reflection collection of illustrative plates of the polarization maintaining optical fiber apodization double gratings of Huo Deing as shown in Figure 6, its test condition is as follows: resolution is 0.1nm, sensitivity is HIGH1, mean value is 1, sampled point is 501.As can be seen from Figure 6: centre wavelength=976.293nm, bandwidth (FWHM)=1.284nm, Sidelobe Suppression is than (SLSR)=27.75dB.
The transmission collection of illustrative plates of this grating as shown in Figure 7, its test condition is as follows: resolution is 0.1nm, sensitivity is HIGH1, mean value is 1, sampled point is 501.As can be seen from Figure 7: centre wavelength=976.228nm, bandwidth=1.292nm, reflectivity=12.41%.
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 7mm * 10mm.
This grating reflection collection of illustrative plates as shown in Figure 8, as can be seen from Figure 8: centre wavelength=975.618nm, bandwidth (FWHM)=0.065nm, Sidelobe Suppression is than (SLSR)=26.94dB.
The transmission collection of illustrative plates of this grating as shown in Figure 8, as can be seen from Figure 8: centre wavelength=975.618nm, bandwidth (FWHM)=0.065nm, reflectivity=26.23%.
The present invention can make interior bandwidth＜1.5nm of 850nm-1650nm wavelength coverage and the polarization maintaining optical fiber apodization double gratings of Sidelobe Suppression ratio＞20dB, is mainly used in pumped amplifier and polarization maintaining optical fibre sensor etc.
Claims (7)
1, a kind of method for making of polarization maintaining optical fiber apodization double gratings, its step is as follows:
1) ultraviolet light that excimer laser is produced with plane mirror carries out 90 degree refractions, and guarantees that refract light is parallel to optical table;
2) the ultraviolet light vertical irradiation after will reflecting uses the amplitude template that a kind of function in Gaussian window, Hanning window, Hamming window or the Blackman window is made, 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;
3) be that the cylindrical lens of 10.2-508.6mm vertically compresses the ultraviolet light hot spot with radius-of-curvature;
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, forms first grating;
6) apart from first grating 〉=5mm place by above 1) to 5) and step write second grating.
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, preparing grating method according to claim 2 is characterized in that the light inlet of said ultraviolet light parallel beam expand device directly is 4-10mm, and expanding the bundle multiple is 2-10.
4, according to claim 1,2 or 3 preparing grating method, it is characterized in that the window size of said amplitude template is: high 0.2～15mm, wide 0.4～50mm;
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.
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| CNB2007101884993A CN100437168C (en) | 2007-12-06 | 2007-12-06 | Manufacturing method of polarization maintaining optical fiber apodization double gratings |
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| CNB2007101884993A CN100437168C (en) | 2007-12-06 | 2007-12-06 | Manufacturing method of polarization maintaining optical fiber apodization double gratings |
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| CN100437168C true CN100437168C (en) | 2008-11-26 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102221727B (en) * | 2011-07-18 | 2012-11-07 | 武汉理工大学 | Apodizing device and method for realizing single exposure |
| CN106249348B (en) * | 2016-09-13 | 2017-10-03 | 中国人民解放军国防科学技术大学 | A kind of apodization fiber grating carving and writing method |
| CN106908896A (en) * | 2017-03-31 | 2017-06-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | A kind of method and device for making fiber grating |
| CN111856644B (en) * | 2020-07-28 | 2023-10-03 | 中国人民解放军国防科技大学 | Apodized long-period fiber bragg grating inscription device, inscription method and laser system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278069A (en) * | 2000-06-23 | 2000-12-27 | 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 |
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Patent Citations (4)
| 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 |
| CN1278069A (en) * | 2000-06-23 | 2000-12-27 | 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 |
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Inventor after: Li Zhongzhi Inventor after: Zheng Renwei Inventor after: Ren Baoguo Inventor after: He Yi Inventor before: Zheng Renwei Inventor before: Ren Baoguo Inventor before: He Yi |
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