四波混频在长距离相干光纤传输中的影响

Effects of four-wave mixing in long distance Coherent optical fibre transmission

本文研究光纤非线性现象之一的四波混频对长距离相干多路光纤传输系统的影响.通过对一条长度为550km,采用9个掺铒光纤放大器的频分复用系统的实验,清楚地观察到了四波混频这一光纤非线性.实验的结果符合对四波混频的理论分析与计算.结果表明:对信息容量在每秒10~9bit数量级,采用常规的不归零码作信号方式的多路传输,光纤中的四波混频现象将严重地影响其传输性能.

In this paper, effects of one of the fibre nonlinearities, four-wave mixing, in long distance coherent multichannel optical fibre transmission are studied. An optical frequency division multiplexed system with 9 erbium doped fibre amplifiers, transmitting over 550 km of fibre is used in the expreiment. The nonlinear interactions between the channels due to the four-wave mixing are clearly observed. Experimental results are well agreed with the theoretical analysis and calculations. Results show that for multichannel transmission at several Gbit/s with conventional non-return to zero data, transmission performance is significantly affected by the four-wave mixing.