Weak fiber grating reflectivity measurement method

A weak fiber grating and fiber grating technology, which is applied in the field of spectral measurement technology to achieve the effect of reducing elimination, short interval time, and satisfying accurate measurement

Active Publication Date: 2015-07-22
东开数科(山东)产业园有限公司
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  • Application Information

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a method for measuring the reflectivity of weak fiber gratings, which greatly reduces the problem of light source power jitter, and eliminates the influence of the unevenness of the light source on the test

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Embodiment Construction

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] The present invention provides a method for measuring the reflectivity of weak fiber Bragg gratings. The method calculates and measures the reflectivity of weak fiber Bragg gratings by acquiring double reflection spectra, which can reduce and eliminate the unevenness of the input light source and output power jitter, fiber end faces and fiber optics. Influence of splice connection etc. on weak FBG reflectivity measurement. The flow chart of the method is as follows figure 2 As shown, specifically include the following steps;

[0029] S1: Place the fiber Bragg grating to be tested in a low reflectivity fiber Bragg grating reflectivity test system;

[0030] Low reflectivity fiber grating reflectivity test system such as image 3 As shown, the system includes APC-type fiber optic connectors, UPC-type fiber optic connectors, 1X2 spli...

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Abstract

The invention relates to a weak fiber grating reflectivity measurement method and belongs tot he technical field of spectral measurement. The method particularly includes arranging a fiber grating to be measured in a low reflectivity fiber grating reflectivity test system, cleaning a UPC type fiber joint of the fiber grating to be measured clearly, arranging the fiber joint into medium 1, and acquiring the reflection spectrum of the fiber grating to be measured; maintaining the fixation of the system, cleaning the UPC type fiber joint clearly and rapidly before arranging into medium 2, and acquiring the reflection spectrum of the fiber grating to be measured once again; finally, utilizing the peaks of the reflection spectrum to calculate the weak fiber grating reflectivity. According to the method, the double reflection spectrum is acquired to calculate the weak fiber grating reflectivity, influence on measurement by the fiber end surface and fiber joint is eliminated, the problem of light source power vibration is reduced greatly, and the requirement of accurate weak fiber grating reflectivity measurement can be met.

Description

technical field [0001] The invention belongs to the technical field of spectrum measurement technology and relates to a method for measuring the reflectivity of weak optical fiber gratings. Background technique [0002] Fiber Bragg Grating is a kind of fiber optic device widely used in the fields of fiber optic communication, fiber laser, fiber optic sensing, etc. It has the function of reflecting specific wavelengths. In the application of fiber gratings, reflectivity is an index to characterize the performance of fiber gratings. According to the reflectivity, fiber gratings are divided into strong and weak points. In fiber optic communication and fiber laser applications, weak fiber gratings often play an important role in filtering and wavelength locking; when applied to fiber optic sensing, it helps to avoid the limitation of multiplexing capacity and realize high-density quasi-distributed sensing. When using weak fiber gratings for design or application, it is very im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
Inventor 陈伟民张伟雷小华许亨艺李竞飞
Owner 东开数科(山东)产业园有限公司
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