用于BOTDR的双通道可调M-Z干涉仪研究  

Research on dual-pass tunable Mach-Zehnder interferometer for BOTDR

作　　者：杨润涛[1] 祝连庆[1] 娄小平[1] 张钰民 骆飞[1] 

机构地区：[1]北京信息科技大学光电信息与仪器北京市工程研究中心,光电测试技术北京市重点实验室,生物医学检测技术及仪器北京实验室,北京100192

出　　处：《激光与红外》2016年第8期1001-1005,共5页Laser & Infrared

基　　金：教育部“长江学者和创新团队”发展计划项目(No.IRT1212);北京市重大科技计划项目(No.Z151100003615010)资助

摘　　要：针对BOTDR分布式光纤传感技术中背向散射光中布里渊散射信号光的分离提取问题,设计了一种高消光比双通道可调M-Z干涉仪,该干涉仪由两个3 d B耦合器、电动光纤延迟线、偏振控制器及光隔离器构成。使用C波段宽带光源(ASE)对M-Z干涉仪性能进行了检测。并将脉宽为100 ns,重复频率为20 k Hz的脉冲光入射到长度为5 km的普通单模光纤中,将其产生的背向散射光经过M-Z干涉仪滤波后,通过光谱仪检测其输出的光谱信号。实验结果表明该干涉仪能够实现大范围高精度可调节滤波功能,对瑞利散射光的抑制超过20d B,可以有效地将背向散射光中的布里渊散射光信号分离提取出来。In order to separate and extract the B rillo u in scattering signal fro m back scattering lig h t in B O T D R d is trib u tedop tical fib e r sensing te ch n o lo g y, a hig h e xtin ctio n ratio dual-pass tunable M ach-Z ehnd er inte rferom eter was designed.The inte rferom eter consists o f two 3 d B c o u p le r,e le c tric fib e r delay lin e , po la rizatio n c o n tro lle r and op tica l isolator.The perform ance o f the M -Z inte rferom eter was tested by using a C band broadband lig h t source （ A S E ） . Pulselig h t w h ich pulse w ide is 100 n s , re p e titio n frequency is 2 0 k H z was in je cte d in to a single mode fib e r w ith the lengtho f 5 km . The backscattering lig h t that generated fro m the fib e r was filte re d through the M -Z in te rfe ro m e te r, then theou tput spectrum signal was detected by the spectrom eter. E xperim enta l results show that the M -Z inte rferom eter can achievea large range o f high precision adjustable filte rin g fu n c tio n ,a n d R ayleigh scattering lig h t was suppressed greaterthan 20 dB. I t can e ffe ctive ly separate and extract the B rillo u in scattering lig h t signals fro m the backscattering lig h t

关 键 词：双通道可调马赫-曾德干涉仪 布里渊光时域反射 消光比 电动光纤延迟线 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]