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Producing method for optical fibre raster with object reflective response realized by amplitude template

A technology of fiber gratings and manufacturing methods, which is applied in the direction of light guides, optics, and optical components, and can solve problems such as inconsistency, incompleteness, and optical path changes in DC refractive index modulation

Inactive Publication Date: 2006-01-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has two disadvantages: one is that the optical path changes after the phase template is removed, and the other is that the position of the second exposure may not completely overlap with the first time due to the influence of the precision of the production platform. These two shortcomings will cause the second exposure to fail. Fully Compensates for DC Index Modulation Inconsistencies

Method used

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  • Producing method for optical fibre raster with object reflective response realized by amplitude template
  • Producing method for optical fibre raster with object reflective response realized by amplitude template
  • Producing method for optical fibre raster with object reflective response realized by amplitude template

Examples

Experimental program
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Effect test

Embodiment I

[0102] The invention realizes a filter with a 3dB bandwidth of 1.5nm and a dispersion linearly changing from -500ps / nm to -100ps / nm with frequency.

[0103] The realization device of this example is as Figure 4 Said that the wavelength of the ultraviolet laser is 244nm, the phase template adopts a uniform phase template with an average period of 1066nm, and the average refractive index of the photosensitive optical fiber is 1.4512.

[0104] Using Fourier transform to do fiber grating reconstruction algorithm and formula (5), get the center position z of the amplitude template k and the length L of the light-transmitting slit k The distribution of , and the refractive index amplitude distribution function A of the sampled fiber grating k , respectively by Figure 5 , Figure 6 express. Figure 5 The middle abscissa 51 is the number of sampling points k, and the left ordinate 52 is the center position z of the amplitude template k The unit is mm, and the ordinate 53 on th...

Embodiment II

[0107] The invention realizes a filter with a 3dB bandwidth of 1.5nm and a dispersion linearly changing from -500ps / nm to -100ps / nm with frequency.

[0108] The implementation device of this example is the same as the embodiment 1 of the invention.

[0109] In this example, on the basis of Embodiment 1, the amplitude template is corrected as formula (6) so as to avoid apodization in the manufacturing process. The center position z of each light-transmitting slit of the corrected amplitude template k same Figure 5 The curve 54 in, while the length L of the light-transmitting slit k distributed as Figure 8 shown. The abscissa 81 represents the number of samples, and the ordinate 82 represents the length L of the light-transmitting slit k The distribution, the unit is mm, 83 is L k Distribution curve with the number of sampling points. The refractive index modulation amplitude A caused by the exposure of each light-transmitting slit in this example k Both are 3.13*10 -...

Embodiment III

[0112] The invention realizes a filter with a 3dB bandwidth of 1.5nm and a dispersion linearly changing from -500ps / nm to -100ps / nm with frequency.

[0113] The implementation device of this example is the same as the embodiment 1 of the invention.

[0114] In this example, on the basis of the embodiment I, the amplitude template is corrected as formula (7) so as to avoid the apodization compensation in the manufacturing process. The length L of each light-transmitting slit of the corrected amplitude template k distributed as Figure 5 The curve 55 in the center position z k distributed as Figure 10 shown. The abscissa 101 represents the number of samples, and the ordinate 102 represents the center position z of the light-transmitting slit k The distribution, the unit is mm, 103 is z k Distribution curve with the number of sampling points. The refractive index modulation amplitude A caused by the exposure of each light-transmitting slit in this example k The distribut...

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Abstract

A method for preparing fibre optics grating features that amplitude template is applied in method of fabricating phase template for fibre optics grating to realize fibre optics grating designed by method of reconfigrating first class chirp in order to achieve large scale production.

Description

technical field [0001] The invention relates to optical fiber communication, optical sensing and other fields related to optical signal processing, and especially relates to the optical filter therein. Background of the invention [0002] Fiber gratings are widely used as single-input and single-output optical filters in many fields involving optical signal processing, such as optical fiber communication and optical sensing. The so-called fiber grating is an optical waveguide device formed by periodically modulating the refractive index on the optical fiber along the direction of the optical fiber. Its traditional phase template-scanning method is as follows: figure 1 As shown: the ultraviolet 13 is output by the ultraviolet laser 11, firstly reflected by the plane mirror 14 fixed on the translation stage 15, and then diffracted by the phase template 16 to form ±1st order diffracted light, which forms along the overlapping region 18 The periodically fluctuating light inten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/124H04B10/12
Inventor 戴一堂陈向飞谢世钟
Owner TSINGHUA UNIV