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摘 要：本文采用激光器、光调制器、可编程光纤延时阵列及光探测器等构成了新型的微波光纤延迟线系统，对系统的发射、传输和接收三个组成模块进行了理论分析，建立了各模块及系统的数学模型，对系统的传输特性和时延特性进行了仿真。结果表明，此类微波光纤延迟线可视为线性系统。并采用矢量网络分析仪对系统进行了实测，幅频特性和相频特性在合理频带范围内均接近于理想情况，群时延测量结果与理论计算一致，延时精度达到10 ps以内。

关键词：微波光纤延迟线；相时延；群时延；矢量网络分析仪

中图分类号：TN253 TN929.1  文献标识码：A  国家标准学科分类代码：510.5020

Analysis and measurement of delay property for programmable
microwave fiber delay line

Zhang Chunxi, Zhang Xiaoqing, Hu Shuling, Chen Yinan, Hu Hanwei

（School of Instrument Science and Optoelectronics Engineering,Beihang University, Beijing 100191, China）

Abstract：This paper presents a novel microwave fiber delay line system made up of a laser diode, an optical modulator, a programmable fiber delay array based on optical switches and a photoelectric detector. The emitting module, transfer module and receiving module are analyzed theoretically; the models of individual modules and the system are built. Simulation results of transmission property and delay property show that the system is linear. Measured by a vector network analyzer, the amplitude-frequency characteristics and phase-frequency characteristics of the system are both close to ideal condition in a reasonable frequency range. The measurement results of group delay accord with theoretical calculation compley. The time delay precision of the microwave fiber delay line is within 10 ps.

Key words：microwave fiber delay line; phase delay; group delay; vector network analyzer

北京锦坤科技有限公司

www.jonkon.com.cn