A broadband integrated microwave photonic mixer based on balanced photodetection  

作　　者：Zhenzhu Xu Li Mei Yuhua Chong Xudong Gao Shoubao Han Chengkun Yang Lin Li 

机构地区：[1]Anhui Province Engineering Laboratory for Antennas and Microwave,East China Research Institute of Electronic Engineering,Hefei 230000,China [2]Representative Ofce of the Army Armament Department in Hefei District,Hefei 230000,China

出　　处：《Frontiers of Optoelectronics》2023年第2期63-70,共8页光电子前沿（英文版）

基　　金：supported by the Key Research and Development Program of Anhui Province(Nos.2022a05020027 and 202104a05020052);Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2020WNL0KF005).

摘　　要：An integrated microwave photonic mixer based on silicon photonic platforms is proposed,which consist of a dual-drive Mach–Zehnder modulator and a balanced photodetector.The modulated optical signals from microwave photonic links can be directly demodulated and down-converted to intermediate frequency(IF)signals by the photonic mixer.The converted signal is obtained by conducting of-chip subtraction of the outputs from the balanced photodetector,and subsequent fltering of the high frequency items by an electrical low-pass flter.Benefting from balanced detection,the conversion gain of the IF signal is improved by 6 dB,and radio frequency leakage and common-mode noise are suppressed signifcantly.System-level simulations show that the frequency mixing system has a spurious-free dynamic range of 89 dB·Hz^(2/3),even with deteriorated linearity caused by the two cascaded modulators.The spur suppression ratio of the photonic mixer remains higher than 40 dB when the IF varies from 0.5 to 4 GHz.The electrical-electrical 3 dB bandwidth of frequency conversion is 11 GHz.The integrated frequency mixing approach is quite simple,requiring no extra optical flters or electrical 90°hybrid coupler,which makes the system more stable and with broader bandwidth so that it can meet the potential demand in practical applications.

关 键 词：Microwave photonics Integrated photonics Frequency conversion Photonic mixer Balanced detection 

分 类 号：TN253[电子电信—物理电子学]