光纤四波混频多波长时钟信号整形

Four-wave-mixing-based multi-wavelength clock reshaping

将两路时钟信号作为泵浦光,与连续探测光一同耦合进高非线性光纤中,四波混频产生的两路闲频光作为整形后的时钟信号,并通过控制两路时钟信号之间的相对时间延迟来减小光纤四波混频干扰。研究了整形前时钟信号占空比的变化与整形后时钟质量的关系以及最佳占空比下输入时钟信号和输出时钟信号的相对幅度抖动的关系,发现在占空比由小到大变化的过程中,整形后时钟信号的质量总体上先变好后变坏;在最佳占空比0.14下,两路时钟信号的相对幅度抖动由原来的13.934 9%和13.958 6%下降到2.03%和2.12%,表明了该方案的可行性。

Two-wavelength clock reshaping via four-wave mixing has been studied by simulation.A pump which is shared by the two channels of clock signals is coupled into the highly nonlinear fiber with a probe.Interchannel crosstalk of four-wave mixing can be avoided when we add a time delay into one channel to separate the two clocks.Two idles generated via four-wave mixing are the reshaped clock.The relation between duty cycles of the input clocks and the quality of reshaped clocks has been studied.The relation of the relative amplitude jitters between input clock signal and output clock signal under optimum duty cycles has also been investigated.When the duty cycles increase,the quality of reshaped clocks improves and then deteriorates.At the optimum duty cycle of 0.14,the relative amplitude jitters fall from 13.934 9% and 13.958 6% to 2.03% and 2.12%,which proves the method is feasible.