Simulation of high signal-to-noise ratio resonant photodetector for homodyne measurement and its verification

Shaofeng Wang; Wei Liu; Xuyin Niu; Guangqian Wu; Ruifang Dong

doi:10.1063/5.0235927

Simulation of high signal-to-noise ratio resonant photodetector for homodyne measurement and its verification

Rev Sci Instrum. 2025 Jan 1;96(1):013002. doi: 10.1063/5.0235927.

Authors

Shaofeng Wang¹, Wei Liu¹, Xuyin Niu¹, Guangqian Wu¹, Ruifang Dong^{2

3}

Affiliations

¹ Shanxi Key Laboratory of Wireless Communication and Detection, College of Physics and Electronic Engineering, Shanxi University, Taiyuan, Shanxi 030006, China.
² Key Laboratory of Time Reference and Applications, National Time Service Center, Chinese Academy of Sciences, Xi'an, Shaanxi 710600, China.
³ School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China.

PMID: 39785504
DOI: 10.1063/5.0235927

Abstract

In this paper, two models for simulating the shot noise and electronic noise performances of resonant photodetectors designed for homodyne measurements are presented. One is based on a combination of a buffer and a low-noise amplifier, and the other is based on an operational amplifier. Through the comparisons between the numerical simulation results and the experimentally obtained data, excellent agreements are achieved, which show that the models provide a highly efficient guide for the development of a high signal-to-noise ratio (SNR) resonant photodetector. Furthermore, we demonstrate a high SNR resonant photodetector for homodyne measurements at the 147 MHz optical sideband, achieving a 20.8 dB SNR of the shot noise to the electronic noise with a 2 mW optical signal input, utilizing a combination of a buffer and a low-noise amplifier. Concurrently, we have obtained another resonant photodetector at the 1.14 GHz optical sideband, which exhibits a 13 dB SNR based on an operational amplifier.