摘要
报道了一种基于双向拉曼放大的布里渊光时域分析系统(Brillouin optical time domain analyzer,BOTDA).利用双向拉曼抽运对信号光进行拉曼放大以补偿光纤损耗及布里渊抽运波的消耗,从而使光纤后端的测量分辨率得到改善,测量分辨率在整段传感光纤趋于一致,同时避免了调制不稳定性引起的频谱扩展,克服了传统BOTDA存在的信号强度指数下降的弊端,使传感精度得到进一步提高.实验实现了50km传感距离,温度分辨率达0.6℃,空间分辨率为50m.实验测量并分析了基于双向拉曼放大的BOTDA信噪比和光功率分布特性.
We report a Brillouin optical time domain analyzer （ BOTDA） based on bi-directional Raman amplification in this paper. With the bi-directional Raman amplification,the loss of the optical fiber and the depletion of Brillouin pump light can be compensated for efficiently,hence the measurement resolution is improved at the end of the optical fiber significantly. The detected signal is stable along the whole length of the sensing fiber,free from the spectral broadening caused by the modulation instability and the problem of uneven ness of detected signals of the conventional BOTDA. The Raman amplification is very useful for enhancing the measurement accuracy. With the bi-directional Raman pump,a temperature resolution of 0. 6 ℃ was achieved over a sensing distance of 50 km with a 50 m spatial resolution. The signal- to-noise ratio and the optical signal power distribution characteristics of the system have been studied by experiment.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第8期5523-5527,共5页
Acta Physica Sinica
基金
国家高技术研究发展计划(批准号:2007AA01Z245)资助的课题~~
关键词
分布式光纤传感
受激拉曼放大
布里渊增益
布里渊光时域分析
distributed optical fiber sensing
stimulated Raman amplification
Brillouin gain
Brillouin optical time domain analyzer
