SiN-on-SOI Optical Phased Array LiDAR for Ultra-Wide Field of View and 4D Sensing
Laser & Photonics Reviews(2024)
摘要
Three-dimensional (3D) imaging techniques are facilitating the autonomous
vehicles to build intelligent system. Optical phased arrays (OPAs) featured by
all solid-state configurations are becoming a promising solution for 3D
imaging. However, majority of state-of-art OPAs commonly suffer from severe
power degradation at the edge of field of view (FoV), resulting in limited
effective FoV and deteriorating 3D imaging quality. Here, we synergize chained
grating antenna and vernier concept to design a novel OPA for realizing a
record wide 160-FoV 3D imaging. By virtue of the chained antenna, the OPA
exhibits less than 3-dB beam power variation within the 160 FoV. In
addition, two OPAs with different pitch are integrated monolithically to form a
quasi-coaxial Vernier OPA transceiver. With the aid of flat beam power profile
provided by the chained antennas, the OPA exhibits uniform beam quality at an
arbitrary steering angle. The superior beam steering performance enables the
OPA to accomplish 160 wide-FoV 3D imaging based on the
frequency-modulated continuous-wave (FMCW) LiDAR scheme. The ranging accuracy
is 5.5-mm. Moreover, the OPA is also applied to velocity measurement for 4D
sensing. To our best knowledge, it is the first experimental implementation of
a Vernier OPA LiDAR on 3D imaging to achieve a remarkable FoV.
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