基于光功率补偿下的弱光栅光谱质量分析方法  

Spectral quality analysis of weak gratings based on optical power compensation

作　　者：邵向鑫[1] 刘成福 朱恒 江虹[1] SHAO Xiangxin;LIU Chengfu;ZHU Heng;JIANG Hong(School of Electrical and Electronic Engineering,Changchun University of Technology,Changchun 130012,China)

机构地区：[1]长春工业大学电气工程学院,长春130012

出　　处：《激光杂志》2023年第12期132-138,共7页Laser Journal

基　　金：吉林省自然科学基金(No.20210101479JC)。

摘　　要：针对大容量光纤光栅传感网络存在前端与末端反射率不一致的问题,利用一种自适应光功率补偿的方法,使经过补偿后的光纤光栅反射光谱的反射功率差别不大,解决了光栅传感网络前后端反射率不一致的问题,在此基础上针对光纤光栅的光谱质量至今没有完整的体系进行评估,提出了利用阈值、光谱信号特征提取以及特征数据计算对比,从反射功率、3 DB带宽宽度、旁瓣抑制比以及主峰不对称性等方面逐步进行质量评价,覆盖了光纤光栅谱型的各个特征,由评估情况观测光谱有无畸变,由此评价光纤光栅的质量。实验表明,在利用光功率补偿,解决光谱反射率不一致问题的基础上,本评价体系可以全面快速地识别出现畸变的光纤光栅,并标明畸变类型,有利于针对不同类型的畸变进行处理修整,且误检率较低。Aiming at the problem of inconsistent reflectance between the front end and the end of the large-capaci-ty fiber Bragg grating sensor network,an adaptive optical power compensation method is used to make the reflected power of the compensated fiber Bragg grating reflectance spectrum little difference,which solves the problem of incon-sistent reflectance between the front and rear ends of the grating sensor network.On this basis,there is no complete system to evaluate the spectral quality of fiber Bragg grating so far.This paper proposes to use threshold,feature ex-traction of spectral signal and calculation and comparison of feature data to evaluate the spectral quality step by step from the aspects of reflection power,3 DB bandwidth width,sideclobe rejection ratio and main peak asymmetry,cov-ering all features of fiber Bragg grating spectral type.The quality of fiber Bragg grating can be evaluated by observing whether the spectrum is distorted or not.The experiment shows that,on the basis of solving the problem of inconsistent spectral reflectance by using optical power compensation,this evaluation system can comprehensively and quickly iden-tify the distorted fiber Bragg grating and indicate the distortion type,which is conducive to the processing and dressing of different types of distortion,and the false detection rate is low.

关 键 词：光纤光栅 质量分析 功率补偿 反射功率 

分 类 号：TN702[电子电信—电路与系统]