Bias-Independent Inter-Modulation Method for Simultaneously Measuring Low-Frequency Modulation and Bias Half-Wave Voltages of Mach-Zehnder Modulators  

作　　者：Junfeng ZHU Xinhai ZOU Ying XU Yutong HE Yali ZHANG Zhiyao ZHANG Shangjian ZHANG Yong LIU 

机构地区：[1]Advanced Research Center for Microwave Photonics(ARC-MWP),State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China

出　　处：《Photonic Sensors》2023年第2期30-36,共7页光子传感器（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Grant No.61927821);National Key Research and Development Program ofChina(Grant No.2018YFE0201900);Fundamental Research Funds for the Central Universities(Grant No.ZYGX2019Z011).

摘　　要：A bias-independent inter-modulation method is proposed and demonstrated for measuring low-frequency modulation and bias half-wave voltages of Mach-Zehnder modulators(MZMs).The method consists of simultaneous sinusoidal modulation on the modulation and bias ports of the MZM under test.Sinusoidal-modulated sidebands heterodyne with each other and generate the desired inter-modulation products after photodetection,which allows extracting both the modulation depth and half-wave voltage for the modulation and bias ports of the MZM.Our method is independent of bias voltages of the MZM,which can be canceled out by carefully choosing the sinusoidal-modulation frequencies.Moreover,the proposed method enables the low swing voltage for measuring both the modulation depth and half-wave voltage of MZMs.Experiments indicate that the proposed method features the simple setup and high accuracy for low-frequency response measurement ranging from 1 Hz to 1 MHz.

关 键 词：Electrooptical modulation fiber optics systems half-wave voltage INTER-MODULATION 

分 类 号：TN761[电子电信—电路与系统]