面向微波光子矢量网络分析仪的软件门控方案  

Software gate control scheme for microwave photonic vector network analyzer

作　　者：王嘉辉 陈萧恩 陈建平[1] 吴龟灵[1] WANG Jiahui;CHEN Xiaoen;CHEN Jianping;WU Guiling(State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 20040,China)

机构地区：[1]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《光通信技术》2025年第2期85-89,共5页Optical Communication Technology

基　　金：国家自然科学基金项目(61627817)资助。

摘　　要：为了提高微波光子矢量网络分析仪(MPVNA)进行脉冲测量时的动态范围,提出了一种软件门控方案,该方案利用临时闲置接收通道接收与脉冲激励产生的控制信号同源的脉冲方波,以此生成门控信号。通过这个门控信号对采集到的待测器件脉冲响应进行控制,有效提高了信噪比和测量的动态范围。对10 GHz带通滤波器的脉冲散射参数(S参数)进行了测量,实验结果表明:在占空比为1%的脉冲激励下,应用软件门控的测量动态范围相比未应用门控时的提高了约20 d B;门控处理后测得的S11和S22参数曲线也因为信噪比的提升更加光滑和稳定。To improve the dynamic range of microwave photonic vector network analyzers(MPVNA)during pulse measurements,a software gate control scheme is proposed.This scheme utilizes the temporarily idle receiving channel to receive a pulse square wave that is sourced from the control signal generated by the pulsed excitation,thus generating a gate control signal.By using this gate control signal to control the pulse response of the device under test that has been collected,the signal-to-noise ratio and the measurement's dynamic range are effectively improved.The pulse scattering parameters(S-parameters)of a 10 GHz band-pass filter were measured.Experimental results show that under a 1%duty cycle pulsed excitation,the measurement dynamic range with the software gate control applied has increased by approximately 20 dB compared to when no gate control control was used.The S11and S22parameter curves measured after gate control processing are also smoother and more stable due to the improvement in the signal-to-noise ratio.

关 键 词：微波测量 矢量网络分析 脉冲测量 光采样 软件门控 

分 类 号：TN787.3[电子电信—电路与系统]