FMCW LiDAR with a coherent receiver chip based on 3 μm SOI photonics platform

Chengjie Xu; Chenyang Liu; Yanyue Ding; Ruxue Wang; Aimin Wu

Results in Physics (Feb 2024)

FMCW LiDAR with a coherent receiver chip based on 3 μm SOI photonics platform

Chengjie Xu,
Chenyang Liu,
Yanyue Ding,
Ruxue Wang,
Aimin Wu

Affiliations

Chengjie Xu: National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Chenyang Liu: National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Yanyue Ding: National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Ruxue Wang: National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Corresponding authors at: National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
Aimin Wu: National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Corresponding authors at: National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.

Journal volume & issue: Vol. 57
p. 107327

Abstract

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Silicon photonics is considered as the ideal solution for chip-scale solid Frequency Modulated Continuous Wave (FMCW) Light Detection and Ranging (LiDAR). In this paper, a coherent receiver chip, integrating beam splitters, 180-degree mixers, germanium-balanced photodetectors, and an on-chip temperature sensor is presented. Benefiting from the micron-scale silicon photonics platform, the propagation loss of the waveguide is 0.19 dB/cm, and the imbalance of 180-degree mixers is only 0.30 dB at 1550 nm. The 3 dB cut-off frequency of the balanced photodetector reaches 37.3 GHz, and the responsivity is 0.32A considering the coupling loss. An FMCW LiDAR system with the coherent receiver chip is built for ranging and velocity measurement. Ranging of distance at 120 m with the precision of 0.3 m is achieved. The micron-scale silicon photonics platform can also provide the capabilities for multi-channel coherent receivers and monolithic integration of transmitters and receivers, providing another practical approach for solid state FMCW LiDAR system which can be applied to autopilot, medical and other field for their lightweight requirement.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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