40 Gb/s信号全光3R再生实验

提出一种新型40 Gb/s全光3R再生器方案。采用高精细度法布里-珀罗滤波器进行时钟提取。时钟提取前,通过高稳定光源对输入信号光波长变换实现信号光波长和法布里-珀罗滤波器梳状窗口对准;时钟提取后,接半导体光放大器(SOA)进一步消除时钟信号噪声。全光判决中,采用双半导体光放大器串联增大非线性性能,提高了判决门的响应速度。判决输出接窄带滤波器去除脉冲啁啾拖尾,减小码型效应。实验中,恶化40 Gb/s光脉冲信号通过全光3R再生器可以得到再生脉冲。输入恶化信号时间抖动大于5 ps,脉冲宽度大于16 ps,再生得到的信号时间抖动小于1.5 ps。再生信号相对于输入信噪比改善14 dB。连续稳定工作记录大于15 h。通过实验验证,这种全光3R再生器方案成功地实现了40 Gb/s信号的再生。

Experimental Study on 40 Gb/s All Optical 3R Regeneration

A novel 40 Gb/s all optical 3R regenerator was proposed. High finesse Fabry-Pérot (F-P) filter was used in clock recovery. Before clock recovery, a stable laser was used in wavelength conversion to aim the wavelength of input signal at the window of F-P filter. After clock recovery, the low frequency noise in the recovery clock was suppressed using semiconductor optical amplifier (SOA). In the all optical decision gate, dual SOAs in series were used to lengthen active region of SOA and to rise the optical switching speed. The pattern effect of the output of decision gate was eliminated by using narrow band filter. In experimental study, new 40Gb/s optical signal was regenerated from degraded optical signal using this 3R regenerator. The timing jitter and pulse width of the degraded signal were larger than 5 ps and 16 ps. Compared with these, the timing jitter of the regenerated pulse was 1.5 ps. The signal noise ratio improved 14 dB. This regenerator was recorded to work continually more than 15 h. This experiment testified that the new scheme of regenerator can work successfully in 40 Gb/s all optical 3R pulse regeneration.