相干光时域反射仪中受激布里渊散射的抑制  

Restrain of stimulated Brillouin scattering in coherent optical time domain reflectometer

作　　者：钟镇[1] 宋跃江[1] 陈勐勐[1] 张旭苹[1] 

机构地区：[1]南京大学光通信工程研究中心,江苏南京210093

出　　处：《光电子．激光》2010年第10期1499-1502,共4页Journal of Optoelectronics·Laser

基　　金：国家重点基础研究发展计划资助项目(2010CB327803);国家自然科学基金资助项目(60644001)

摘　　要：采用对分布反馈半导体激光器(DFB-LD)直接进行小信号电流调制的方法抑制相干光时域反射仪(COT-DR)中的受激布里渊散射(SBS),分析了DFB-LD受到小信号电流调制时的频谱特性以及SBS阈值和频谱宽度的关系,设计了实验电路和光路抑制光纤中SBS。理论分析和实验结果表明,在低频调制电流处,光源频谱宽度随调制频率增加而减小,随调制幅度增加而增加,而SBS随频谱宽度增加而减弱,直接用电流调制激光器可抑制COTDR中的SBS。Directly modulating the distributed feedback laser diode（DFB-LD） by small signal current can restrain the stimulated Brillouin scattering（SBS） in coherent optical time domain reflectometer（COTDR）.The optical spectrum characteristics and the relationship between the threshold value of stimulated Brillouin scattering and the spectrum width are analyzed,and the optical circuit and electrical circuit are designed to restrain stimulated Brillouin scattering.Theoretical analysis and experimental result show that optical source spectrum width decreases with modulating frequency increasing and increases with modulating amplitude increasing under low frequency modulating current,and the stimulated Brillouin scattering weakens with spectrum width increasing,so directly modulating the laser by current can restrain SBS in coherent optical time domain reflectometer.

关 键 词：相干光时域反射仪(COTDR) 受激布里渊散射(SBS) 分布反馈半导体激光器(DFB-LD) 调制 

分 类 号：TN929.11[电子电信—通信与信息系统]