A symmetric beam scanning system and its working method
A beam scanning and symmetrical technology, applied in the directions of optical waveguides, light guides, optics, etc., can solve the problems of need, occupy chip area, multiple arrays, etc., and achieve the effect of reducing large bandwidth requirements, easy mass production, and small size
Active Publication Date: 2021-04-06
ZHEJIANG UNIV
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The disadvantage of this solution is a wide range of vertical angles, requiring more arrays and occupying more chip area
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[0024] The present invention will be further described below in conjunction with drawings and embodiments. The embodiments described below are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0025] The system structure of the present invention is as figure 1 As shown, it includes an input coupler 1, a 1×2 optical switch 2, two groups of mutually symmetrical beam splitting phase modulation substructures 3a and 3b including an optical beam splitting network 4 and an optical waveguide phase modulation array 5, and an optical beam consisting of a symmetrical grating antenna 7 Launch array6. The laser light is coupled into the optical path of the system from the input coupler 1. The output terminal of the input coupler 1 is connected with the input te...
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Abstract
The invention discloses a symmetrical light beam scanning system and a working method thereof. The system sequentially includes an input coupler, a 1x2 optical switch, two groups of mutually symmetrical beam-splitting and phase-modulating substructures, and an optical emission array in sequence according to the order of the optical paths; the two groups of mutually symmetrical beam-splitting and phase-modulating substructures are identical, including An optical beam splitting network and an optical waveguide phase modulation array; the optical emission array is composed of a symmetrical grating antenna; the output end of the input coupler is connected to the input end of the 1x2 optical switch, and the two output ends of the 1x2 optical switch pass through the single-mode optical waveguide They are respectively connected to two beam-splitting phase modulation substructures, and the output ends of the two groups of beam phase modulation substructures are respectively connected to two ends of the same light emitting array. The system is integrated on a silicon-based chip, and through the selection of 1x2 optical switches, it can realize angularly symmetrical dual-beam output, which doubles the range of wavelength-tuned optical beam scanning angles and effectively improves the efficiency of the optical beam scanning system.
Description
technical field [0001] The invention relates to a two-dimensional light beam scanning system, in particular to a symmetrical light beam scanning system and its working method. Background technique [0002] Lidar is a radar system that emits a laser beam and receives the echo to obtain information such as target distance and speed. In recent years, the rise of unmanned driving, smart home and other fields has triggered the demand for high-precision 3D imaging technology. Among the existing 3D imaging technologies, lidar has attracted people's attention due to its high precision and anti-electromagnetic interference. Especially in the field of unmanned driving, the indispensability of lidar has become an industry consensus. However, the current mainstream lidar adopts a mechanical scanning structure, which is costly and bulky, making it difficult to achieve mass production. One of the solutions to this problem is to use optical phased array technology to integrate the optic...
Claims
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IPC IPC(8): G02B26/10G02B6/124G02B6/12
CPCG02B6/12009G02B6/124G02B26/106G02B2006/12145
Inventor 赵杰周之琰余辉杨建义
Owner ZHEJIANG UNIV