提出了一种基于光电振荡器的高速光采样技术。光电振荡器直接产生高重复频率、低时间抖动的采样脉冲,避免了对低重复频率采样脉冲的时域复用,可降低系统复杂性,提高系统效率。利用此光脉冲对信号进行时域傅里叶变换采样,信号在不同时刻的幅度信息被调制到不同波长的探测光上,再经过波分复用器或可调滤波器滤出不同中心波长的光,实现高速实时采样及串并转换,可与低速率的电模数转换量化匹配。实验产生重复频率为10 GHz、时间抖动为195 fs的光脉冲,并对三种不同波形的信号进行采样,得到采样波形,采样速率达到40 GSa/s。实验结果表明提出的基于光电振荡器的光采样技术是可行的。

A high-speed optical sampling technique based on optoelectronic oscillators is proposed. Optoelectronic oscillators generate sampling pulses with high repetition rates and low time jitter directly, as a result, the time-domain multiplexing of low repetition rate sampling pulses is avoided,the system complexity is reduced, and the system efficiency is improved. The generated pulses are used to sample signals by time-domain Fourier transform, the amplitude information of the signals at different moments are modulated to the detection light at different wavelengths,then the light with different central wavelengths is filtered by wavelength division multiplexer or tunable filters, thus high-speed real-time sampling and serial-parallel conversion are realized, and electronic analog-to-digital conversion quantization with low rate is well matched. The optical pulses with repetition rate of 10 GHz and time jitter of 195 fs are generated in the experiments. Three kinds of signals with different waveforms are sampled, the sampling waveform is obtained, and the optical sampling rate of 40 GSa/s is reached. The experimental results show the feasibility of the proposed optical sampling technique based on optoelectronic oscillators.