基于双向拉曼放大的相位敏感光时域反射仪

摘要

报道了一种基于双向拉曼放大延长相位敏感光时域反射仪分布式光纤传感系统传感距离的方法。利用双向拉曼抽运对信号光进行拉曼放大，补偿了光纤传输损耗。实验表明，该方法提高了整个传感光纤上信号光的分布均匀性，实现了74 km的超长传感距离和20 m的空间分辨率，同时，试验了不同信号光入纤功率和抽运功率对基于双向拉曼放大的相位敏感光时域反射仪系统的影响。%In this paper, we report on a distributed sensing system of phase-sensitive optical time-domain reflectometer (Φ-OTDR) based on bi-directional Raman amplification. With the bi-directional Raman amplification, the transmission loss of the optical fiber can be compensated efficiently. The experimental characterization of evenly detected signals along the whole sensing distance of 74 km with 20 m spatial resolution is successfully demonstrated, resulting in the longest distributed sensing system based phase-sensitive optical time-domain reflectometer reported so far, to the best of our knowledge. The influences of different incident powers and pump powers onΦ-OTDR are studied experimentally.