10 GHz全光帧时钟提取的理论和实验研究

提出了一种新型的10 GHz全光帧时钟提取的提取方案。采用低精细度的法布里-珀罗(F-P)滤波器直接提出帧时钟,保证帧时钟的快速建立和快速消失。利用半导体光放大器(SOA)的自增益调制效应(SGM)对法布里-珀罗滤波器提取的帧时钟进行整形,降低帧时钟的幅度噪声。并推导了法布里-珀罗滤波器的精细度和半导体光放大器的自增益调制效应对帧时钟建立时间、消失时间的影响。通过理论分析表明,利用半导体光放大器的自增益调制效应可以降低帧时钟的幅度噪声并加快帧时钟建立速度。实验中,用上述方案对10.075 GHz的帧信号进行了全光帧时钟提取,得到了建立时间为8个信号周期,消失时间为22个信号周期,抖动为2.35 ps的帧时钟信号。

Theoretical and Experimental Study on 10 GHz All-Optical Packet Clock Extraction

A novel 10 Gbit/s all-optical packet clock extraction is proposed, which comprises a Fabry-Pérot (F-P) filter and a semiconductor optical amplifier (SOA). Low finesse Fabry-Pérot filter was used to directly extract the packet clock from the data packet which ensures that the clock locks fast and vanishes quickly. The clock, amplitude modulated as a result of low-Q filter, then goes into SOA to reduce the low-frequency amplitude noise. The effect of the SOA's SGM on the locking and unlocking time of the packet clock is theoretically analyzed. Instantaneous 10.075 GHz clock extraction experimentally with the establishing time of about 8 codes periods, vanishing time of about 22 codes period and time jitter of 2.35 ps is demostrated.