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提出了一种基于锁模脉冲源和高速光开关的时分抽样模数(A/D)转换系统。使用高重复频率、窄脉宽的锁模脉冲串对射频信号进行抽样,利用高速光开关进行时分复用,将高采样率的信号转换为并行的多路低采样率信号,以适应现有的电模数转换器进行量化和编码,并且通过改变光开关的频率,可以灵活地改变解复用后每路信号的频率。系统的优点在于可扩展性高,只需一个锁模脉冲源。使用10 GHz重复频率的锁模脉冲和1.25 GHz的高速光开关验证了系统方案的可行性。利用实验中得到的采样点可以较好地恢复出时域信号,并且得到了各个频率的频谱图。其信噪比可达32.02 dB,等效于5.03 bit的有效比特数。
A time-division sampling modulus (A / D) conversion system based on mode-locked pulse source and high-speed optical switch is proposed. The RF signal is sampled using a high repetition rate, narrow pulse width mode-locked pulse train and is time division multiplexed with a high speed optical switch to convert the high sampling rate signal into a parallel multi-path low sampling rate signal to adapt to the existing The D / A converter performs quantization and encoding, and by changing the optical switch frequency, the frequency of each signal after demultiplexing can be flexibly changed. The system has the advantage of high scalability, requiring only one mode-locked pulse source. The feasibility of the system solution was verified using a mode-locked pulse of 10 GHz repetition rate and a 1.25 GHz high-speed optical switch. The sampling points obtained in the experiment can recover the time-domain signal well and obtain the spectrum of each frequency. The signal to noise ratio of up to 32.02 dB, equivalent to 5.03 bit effective number of bits.