采用喇曼光纤放大器的长距离光纤传输系统中双重瑞利散射噪声的抑制

Reduction of double Rayleigh backscattering noise in long haul transmission systems employing multi-stage Raman fiber amplifiers

本文研究了在长距离光纤通信系统中,采用多级喇曼光纤放大器的情况下,双重瑞利散射波的产生和放大过程,提出了采用在喇曼光纤放大器中加入隔离器的办法进行双重瑞利散射噪声抑制。比较信号和双重瑞利散射噪声在加入隔离器前后沿传输光纤的功率变化,加入隔离器以后,双重瑞利散射噪声得到了有效地抑制,而信号所受的影响不大。

In this paper we investigate the generation and amplification of double Rayleigh backscattering wave in the long distance optical fiber transmission systems with multiple Raman fiber amplifiers. Proposed is the method to reduce double Rayleigh backscattering noise with isolators inserted in the optical fiber Raman amplifiers. The evolution of signal and noise powers along the fiber are calculated and compared for both cases before and after the isolators are inserted. Double Rayleigh backscattering noise is suppressed greatly by the isolators, while the signal is affected very slightly.