基于高精细度F-P滤波器的40Gb/s全光时钟提取

40 Gb/s all-optical clock recovery using high finesse Fabry-Perot filter

提出了一种基于高精细度Fabry-Perot(F-P)滤波器的全光时钟提取方案,并进行了实验验证。为了实现对信号波长无关的特性,系统利用光纤中交叉相位调制(XPM)效应对输入信号进行正码波长变换,使变换后的波长始终与F-P滤波器的透射峰精确对准。采用精细度为1 012的高精细度F-P滤波器提取时钟,并利用半导体光放大器(SDA)的自增益调制(SGM)效应进一步抑制时钟信号的低频噪声,保证了高质量的时钟输出。实验中,利用这种装置对40 Gb/s归零(RZ)码信号进行了时钟提取,得到了抖动为285 fs的高质量40 GHz时钟信号,验证了方案的可行性。

An all-optical clock recovery scheme based on a high fitness Fabry-Perot（F-P） filter is proposed and experimentally demonstrated.In order to make the scheme insensitive to the signal wavelength,wavelength conversion based on the cross phase modulation（XPM） in the fiber is done,so that the wavelength of the converted signal is always set exactly to the peak wavelength of the F-P filter.An F-P filter with the finesse up to 1012 is used to extract the clock,and the low frequency noise is consequently suppressed by the self-gain modulation（SGM） in a saturated semiconductor optical amplifier（SOA）,which guarantees a high quality output clock.In the experiment,a high quality 40 GHz clock with a timing jitter of 284 fs is successfully extracted from the 40-Gb/s input signal using this scheme.