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解释了当信号速率是法布里-珀罗(F-P)腔的自由光谱区宽度(FSR)的整数倍时,利用F-P腔和基于半导体光放大器(SOA)级联偏移滤波的幅度均衡系统实现全光时钟恢复的原理。从理论上研究了幅度均衡系统中偏移滤波参数对时钟幅度抖动的影响,并且给出了理论上最佳的偏移滤波参数。实验中,为了解决时分复用(OTDM)系统中不同时隙信道信号光相位不同导致F-P腔输出光脉冲幅度严重起伏的问题,采用了对信号光进行波长转换的方法,最终利用FSR为102 GHz的F-P腔和幅度均衡系统成功地分别从102 Gb/s和204 Gb/s归零码开关键控(RZ-OOK)码信号中恢复出了102 GHz和204 GHz的光时钟。其中102 GHz时钟的幅度抖动为8.5%,时间抖动小于236 fs;204 GHz时钟的幅度抖动为9.4%,时间抖动小于251 fs。
Explained the use of FP cavity and SOA based cascaded offset filter for amplitude equalization when the signal rate is an integral multiple of the free spectral region width (FSR) of the Fabry-Perot (FP) cavity All-optical clock recovery principle. The influence of the offset filter parameters on the jitter amplitude of the clock in the amplitude-equalization system is theoretically studied and the theoretically optimal offset filter parameters are given. In the experiment, in order to solve the problem that the amplitude of the output optical pulse of the FP cavity fluctuates greatly due to the different phase of the signal light in different timeslots in the time division multiplexing (OTDM) system, a wavelength conversion method is adopted for the signal light. Finally, the FSR is 102 GHz FP cavity and amplitude equalization systems successfully recovered 102 and 204 GHz optical clocks from 102 Gb / s and 204 Gb / s RZ-OOK code signals, respectively. The amplitude jitter of the 102 GHz clock is 8.5% and the jitter is less than 236 fs. The amplitude jitter of the 204 GHz clock is 9.4% and the jitter is less than 251 fs.