Silicon nonlinear switch as a conditional circulator for monostatic LiDAR systems  

作　　者：Mingfei Ding Yiwei Xie Hao Yan Abu Naim R.Ahmed Reza Safian Swapnajit Chakravarty Leimeng Zhuang Pengcheng Jiao Huan Li Liu Liu Daoxin Dai 

机构地区：[1]Centre for Optical and Electromagnetic Research,State Key Laboratory for Modern Optical Instrumentation,Zhejiang Provincial Key Laboratory for Sensing Technologies,Zhejiang University,Zijingang Campus,Hangzhou 310058,China [2]Ningbo Research Institute,Zhejiang University,Ningbo 315100,China [3]imec USA,Nanoelectronics Design Center,Inc.,Kissimmee,Florida 34744,USA [4]Ocean College,Zhejiang University,Zhoushan 316021,China

出　　处：《Photonics Research》2022年第2期426-432,共7页光子学研究（英文版）

基　　金：National Key Research and Development Program of China (2019YFB2203604);National Science Fund for Distinguished Young Scholars (61725503);Zhejiang Provincial Natural Science Foundation(LZ18F050001);National Natural Science Foundation of China (91950205, 6191101294, 11861121002, 61905209,62175214);International Cooperation and Exchange Programme NSFC-RS (62111530147)。

摘　　要：All-optical silicon-photonics-based LiDAR systems allow for desirable features in scanning resolution and speed,as well as leverage other advantages such as size, weight, and cost. Implementing optical circulators in silicon photonics enables bidirectional use of the light path for both transmitters and receivers, which simplifies the system configuration and thereby promises low system cost. In this work, to the best of our knowledge, we present the first experimental verification of all-passive silicon photonics conditional circulators for monostatic LiDAR systems using a nonlinear switch. The proposed silicon nonlinear interferometer is realized by controlling signal power distribution with power-splitting circuits, allowing the LiDAR transmitter and receiver to share the same optical path. Unlike the traditional concept requiring a permanent magnet, the present device is implemented by using common silicon photonic waveguides and a standard foundry-compatible fabrication process. With several additional phase shifters, the demonstrated device exhibits considerable flexibility using a single chip, which can be more attractive for integration with photodetector arrays in LiDAR systems.

关 键 词：INTERFEROMETER LIDAR NONLINEAR 

分 类 号：TN958.98[电子电信—信号与信息处理]