中心博士生钱娜的工作——“Impact of the demultiplexer on channel-interleaved photonic analog-to-digital converters（解复用器对通道交织型光子模数转换器的影响）”近期被Photonics Journal期刊接收，该工作得到了国家重点研发计划（2019YFB2203700）、国家自然科学基金（61822508，61571292）的部分资助。该工作通过频域建模研究了通道交织型光子模数转换器（即“CI-PADC”）中的解复用器及其对CI-PADC系统性能的影响。分析表明，解复用器对不同频段信号的输出功率有不同程度的影响。在此基础上，提出了一种利用品质因数（FoM）来定量评估解复用器影响的方法，根据定量评估结果能够有效地调节解复用器使得其对不同频段信号的影响最小化。该工作以基于双输出马赫增德尔调制器的CI-PADC系统为例，实验验证了依据FoM优化解复用器影响的可行性。结果表明，该CI-PADC系统能够在20 GHz范围内具有平坦频率响应。这种利用FoM评估和优化解复用器影响的方法，不受限于CI-PADC系统通道数目，并且适用于基于不同原理的解复用器（如：时分/波分解复用器）。
摘要: We investigate the demultiplexer in channel-interleaved photonic analog-to-digital converter (CI- PADC) and its influence on the performance of CI- PADC system by frequency domain modeling. The theoretical analysis reveals that the output power of the signal in different frequency sections is affected by the demultiplexer in different degrees. Subsequently, a method based on the derived figure of merit (FoM) is proposed to quantitatively evaluate and effectively minimize the impact of the demultiplexer on the signal in different frequency sections. According to the theoretical analysis, a CI- PADC system demultiplexed via dual-output Mach-Zehnder modulators is implemented to study and optimize the influence of demultiplexer. The experimental results with a flat frequency response in the range of 20 GHz verify the feasibility of the proposed method.