上海交通大学智能微波光波融合创新中心（imLic）助理研究员钱娜的工作——Characterization of the frequency response of channel-interleaved photonic ADCs based on the optical time-division demultiplexer（基于时分解复用器的通道交织型光子模数转换器的频率响应表征）的相关成果近期被Photonics Journal期刊接收发表，该工作得到了国家重点研发计划（2019YFB2203700）、国家自然科学基金（61822508）的部分资助。通过理论分析和实验研究表征了通道交织型光子模数转换器的频率响应。结果表明，通道交织型光子模数转换器的频率响应受光子采样脉冲和时分解复用器的共同影响。并且时分解复用器能够在降低光子采样脉冲重复频率的同时拓宽脉冲光谱宽度，从而进一步扩大通道交织型光子模数转换器的模拟输入带宽。该工作对于简化通道交织型光子模数转换器中脉冲采样光源的设计具有指导意义。
摘要: We characterize the frequency response of channel-interleaved photonic analog-to-digital converters (CI-PADCs) theoretically and experimentally. The CI-PADC is composed of a photonic frontend for photonic sampling and an electronic backend for quantization. The photonic frontend includes a photonic sampling pulse generator for directly high-speed sampling and an optical time-division demultiplexer (OTDM) for channel demultiplexing. It is found that the frequency response of the CI-PADC is influenced by both the photonic sampling pulses and the OTDM, of which the combined impact can be characterized through demultiplexed pulse trains. First, the frequency response can be divided into multiple frequency intervals and the range of the frequency interval equals the repetition rate of demultiplexed pulse trains. Second, the analog bandwidth of the CI-PADC is determined by the optical spectral bandwidth of demultiplexed pulse trains which is broadened in the OTDM. Further, the effect of the OTDM is essential for enlarging the analog bandwidth of the CI-PADC employing the photonic sampling pulses with limited optical spectral bandwidth.