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采用光子学技术实现模-数(A/D)转换,可克服电子瓶颈的限制,大幅度提高采样率,满足宇宙探测、超宽带雷达等应用需求。研究了基于光纤的高速光A/D转换系统,针对被动锁模光纤激光器重复频率低的不足,提出了采用波分复用(WDM)和光时分复用(OTDM)相结合来提高采样脉冲频率的方法,阐述了其中的关键技术,实现了83.97Gs/s高速时间-波长交织光采样脉冲;分析了光纤色散对时钟抖动、进而对系统有效比特数的影响,给出了模拟计算结果;提出了减少色散影响的方法,通过自行研制的高精度机械式微拉伸器进行了色散补偿。实验结果验证了其有效性。
The use of photonics technology to achieve analog-to-digital (A / D) conversion, to overcome the limitations of electronic bottlenecks, a substantial increase in sampling rate to meet the space exploration, ultra-wideband radar and other applications. A high-speed optical A / D conversion system based on optical fiber is studied. In view of the low repetition frequency of the passively mode-locked fiber laser, WDM and OTDM are proposed to improve the sampling pulse frequency Method, the key technologies are described and a high-speed time-wavelength interleaved light sampling pulse of 83.97Gs / s is realized. The influence of fiber dispersion on the clock jitter and thus the effective number of bits of the system is analyzed, and the simulation results are given. Reduce the impact of dispersion methods, through self-developed high-precision mechanical microlobrator dispersion compensation. Experimental results verify its effectiveness.