基于信号抽运的光纤光参量放大的全光3R再生系统

An all-optical 3R regenerator for 40-Gbit/s system based on signal-pump fiber optical parametric amplification

本文研究了利用恶化信号作为抽运的光纤光参量放大效应(FOPA)进行全光判决的全光3R(再放大、再整形、再定时)再生实验方案,理论上分析了在不同的抽运功率条件下时(分别对应"0"和"1"码)参量放大抑制噪声的不同机理,表明选用合理的实验参数可以同时对"0","1"码噪声进行抑制.实验中利用高Q值的法布里-珀罗(F-P)滤波器提取了均方根(RMS)抖动仅为180fs的40GHz时钟;完成了对40bit/s的单波长恶化信号的全光判决实验,将恶化信号的信噪比从4.52改善为11.43.实验验证了理论分析的结论,较好解决了利用参量放大效应进行全光3R再生时所出现的再生效果不均衡的问题.

A novel scheme of all-optical 3R regeneration has been proposed in this paper. Using degraded data signal rather than clock as a pump, all-optical 40Gbps 3R regeneration based on a fiber optical parametric amplification effect （FOPA） is realized with improved performance compared with previous regeneration schemes. Theoretical analysis of the noise suppression mechanism under different pump power （corresponding to ＂0＂ code or ＂1＂ code） is provided. By properly adjusting the parameters of FOPA, amplitude noise on both ＂0＂ code and ＂1＂ code can be suppressed simultaneously. The clock extraction is based on wavelenth conversion and a Fabry-Pérot （F-P） filter with a high Q value of 1000. The theoretical analysis conclusions are verified through experiments, and the imbalance of the 3R regeneration using fiber optical parametric amplication is eliminated. The root mean square （RMS） jitter of the clock extracted is only 180fs. The signal-to-noise ratio of the regenerated signal is improved from 4.52 to 11.43.