基于掺铒光纤放大器的布里渊光时域反射仪的研究

Performance analysis of Brillouin optical time domain reflectometer based on EDFA

摘要:

为了提高布里渊光时域反射仪(BOTDR)的传感长 度和系统分辨率,分析了基于掺铒光纤放大器(EDFA)的BOTDR性能。研究表明,在被测光纤 中,反向泵浦的EDFA在增益和噪声指数方面优于正向泵浦；未使 用EDFA的BOTDR测得光纤长约为50km,而利用EDFA的BDTDR测 量的距离大于80 km；反向泵浦和正向泵浦的温度分辨率分别为0.5℃和1.0℃。结果表明 ,反向泵浦的BDTDR的性能高于正向泵浦。

Abstract:

To enhance the sensing length and system resolution of Brillouin optic al time domain reflectometry (BOTDR),we use the bidirectional erbium doped fiber amplifier (EDFA) in the sensing fiber.I n the experiment,the performance of EDFA with backward pump is better than that with forward pump on the gain and noise figure.The sensing lengths of BOTDRs with and without EDFA is about 50km and 80km respectively,an d the same time,the sensing length of BOTDR with EDFA in the sensing fiber would be greater than 80km.The temperature resolutions of BOTDRs with backward and forward pump EDFAs are about 0.50℃ and 1.0℃,and the performance of BOTDR with backward pump EDFA is higher than that with forward pump.Within the range of pump power,the resolution of BOTDR can b e improved by increasing pump power.The results show that the BOTDR with backw ard pumped EDFA in the sensing fiber has great prospect.