激光雷达
相控阵光学
光束转向
光子学
测距
计算机科学
可扩展性
光圈(计算机存储器)
光子集成电路
栅栏
光学
合成孔径雷达
材料科学
数值孔径
波长
相控阵
梁(结构)
光电子学
物理
电信
人工智能
数据库
声学
天线(收音机)
作者
Nathan Dostart,Bohan Zhang,Anatol Khilo,Michael Brand,Kenaish Al Qubaisi,Deniz Onural,Daniel Feldkhun,Kelvin Wagner,Miloš A. Popović
出处
期刊:Optica
[The Optical Society]
日期:2020-06-17
卷期号:7 (6): 726-726
被引量:97
标识
DOI:10.1364/optica.389006
摘要
Optical phased arrays (OPAs) implemented in integrated photonic circuits could enable a variety of 3D sensing, imaging, illumination, and ranging applications, and their convergence in new lidar technology. However, current integrated OPA approaches do not scale—in control complexity, power consumption, or optical efficiency—to the large aperture sizes needed to support medium- to long-range lidar. We present the serpentine OPA (SOPA), a new OPA concept that addresses these fundamental challenges and enables architectures that scale up to large apertures. The SOPA is based on a serially interconnected array of low-loss grating waveguides and supports fully passive, 2D wavelength-controlled beam steering. A fundamentally space-efficient design that folds the feed network into the aperture also enables scalable tiling of SOPAs into large apertures with a high fill-factor. We experimentally demonstrate, to the best of our knowledge, the first SOPA using a 1450–1650 nm wavelength sweep to produce 16,500 addressable spots in a 27 × 610 array. We also demonstrate, for the first time, far-field interference of beams from two separate OPAs on a single silicon photonic chip, as an initial step towards long-range computational imaging lidar based on novel active aperture synthesis schemes.
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