拉曼放大布里渊光时域分析系统非局域效应  

Non-local effect in Brillouin optical time-domain analyzer based on Raman amplification

作　　者：贾新鸿[1,2] 饶云江[1] 王子南[1] 张伟利[1] 冉曾令[1] 邓坤[1] 杨自新[1] 

机构地区：[1]电子科技大学光纤传感与通信教育部重点实验室,成都610054 [2]四川师范大学物理与电子工程学院,成都610068

出　　处：《强激光与粒子束》2012年第7期1667-1671,共5页High Power Laser and Particle Beams

基　　金：四川省教育厅青年基金项目(09ZB060)

摘　　要：应用包含探测光、布里渊泵浦光及拉曼泵浦光相互作用理论模型,数值分析了基于拉曼放大的长距离布里渊光时域分析仪非局域化特性。结果表明:非局域化随探测光及拉曼泵浦功率增加而恶化;通过频分复用(将具有不同布里渊频移的光纤拼接)及时分复用技术(同时对布里渊泵浦及探测光进行脉冲调制),可有效缩短布里渊泵浦与探测光的作用距离,达到较理想的抑制非局域效应结果。Compared with conventional Brillouin optical time-domain analyzer（BOTDA）,the BOTDA based on Raman amplification allows longer sensing range,higher signal-to-noise ratio and higher measurement accuracy.However,the non-local effect induced by pump depletion significantly restricts the probe optical power injected to sensing fiber,thereby limiting the further extension for sensing distance.In this paper,the coupled equations including the interaction of probe light,Brillouin and Raman pumps are applied to the study on the non-local characteristics of BOTDA based on Raman amplification.The results show that,the system error induced by non-local effect worsens with increased powers of probe wave and Raman pump.The frequency-division-multiplexing（cascading the fibers with various Brillouin frequency shifts） and time-division-multiplexing（modulating both of the Brillouin pump and probe lights） technologies are efficient approaches to suppress the non-local effect,through shortening the effective interaction range between Brillouin pump and probe lights.

关 键 词：布里渊光时域分析仪 非局域化 拉曼放大 频分复用 时分复用 

分 类 号：O439[机械工程—光学工程]