Negative apodization technique for fiber grating based on double-lens beam shaping
A technology of beam shaping and fiber grating, which is applied in optics, optical components, instruments, etc., can solve the problems that it is difficult to ensure the accuracy of apodization, the envelope of the apodization function is complex, and the conjugation of two templates cannot be guaranteed. Difficult to make, easy to install, and widely used
Inactive Publication Date: 2013-10-30
鞍山峰澜科技有限公司
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[0006] However, the envelope of the apodization function is complex, and it is difficult to guarantee the accuracy of apodization, especially the conjugation of two templates.
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[0018] The present invention will be further described below in conjunction with the accompanying drawings.
[0019] As shown in Figure 1(b), the fiber grating reverse apodization technology and device based on double-lens beam shaping includes an ultraviolet laser 1, a tangential apodization template 2, two small cylindrical lenses 6 and 7, a cylindrical lens 3, and an optical fiber 5. The central positions of ultraviolet laser 1, tangential apodization template 2, cylindrical lens 3, and optical fiber 5 are sequentially arranged on a baseline; the distance from cylindrical lens 3 between tangential apodization template 2 and cylindrical lens 3 is small cylindrical lens 6 and 7 Two small cylindrical lenses 6 and 7 next to each other are symmetrically placed at the position of 2 times of the focal length and the length direction of the small cylindrical lenses 6 and 7 is perpendicular to the length direction of the cylindrical lens 3; the two small cylindrical lenses 6 and 7 ar...
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The invention relates to a negative apodization technique for fiber grating based on double-lens beam shaping. A positive apodization process and a negative apodization process for the fiber grating are needed to realize the pure apodization of the fiber grating during a general apodization process. During the two processes, a diaphragm on a positive apodization template and a diaphragm on a negative apodization template are conjugated as required. The technique for manufacturing the negative apodization template strictly conjugated to the positive apodization template in the prior art is more complicated and hard to meet the requirements, which limits the pure apodization precision while the apodized fiber grating is manufactured. According to the method disclosed by the invention, two small cylindrical lenses close to each other are symmetrically arranged at a proper position between the positive apodization template and a cylindrical lens, and the length directions of the small cylindrical lenses are vertical to the length direction of the cylindrical lens, so that the strictly conjugated negative apodization to the fiber grating subjected to the positive apodization is realized, the negative apodization template is omitted and the pure apodization precision is improved. The positive apodization technique for fiber grating based on double-lens beam shaping has good applicability, strong flexibility and simple process.
Description
technical field [0001] The invention belongs to the technical field of optical fiber grating production, and in particular relates to an optical fiber grating reverse apodization technology based on double-lens beam shaping. Background technique [0002] Fiber Bragg Grating (FBG) is a new type of optical passive device, which has the advantages of light weight, small size, high reliability, anti-electromagnetic interference, low insertion loss, good wavelength selectivity, high sensitivity and wide range of measurement, so It has a wide range of applications in optical fiber communication and optical fiber sensing. It can be composed of devices in optical fiber communication and optical fiber sensing, including: semiconductor lasers, optical fiber amplifiers, filters, WDM wavelength division multiplexers, fiber grating dispersion compensators, fiber grating strain sensors, temperature sensors, acceleration sensors, displacement sensors etc. [0003] In order to achieve the...
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IPC IPC(8): G02B27/09
Inventor 于栋友赵春柳李记辉
Owner 鞍山峰澜科技有限公司