Integrated laser scanner based on arrayed waveguide grating and acousto-optic modulation grating

Abstract

The invention discloses an integrated laser scanner based on an arrayed waveguide grating and an acousto-optic modulation grating. The integrated laser scanner comprises an optical gain chip, a polymer chip and an acousto-optic modulation chip which are integrated into a whole. A phase shifter, an adjustable Bragg grating and an array waveguide grating are arranged on the polymer chip. The opticalgain chip, the phase shifter and the adjustable Bragg grating form a wavelength-adjustable laser, the arrayed waveguide grating realizes emergent light scanning in the horizontal direction accordingto the laser wavelength, and the emergent light positions of output waveguides of the arrayed waveguide grating are arranged on the horizontal circumference at equal intervals. The acousto-optic modulation chip comprises an annular interdigital transducer, a piezoelectric crystal waveguide and a substrate, and the annular interdigital transducer is perpendicular to the output waveguide of the arrayed waveguide grating. The device is miniaturized through an on-chip integration mode, and only four pairs of electrodes are needed to realize laser direct modulation pulse generation, laser wavelength adjustment, laser phase compensation and acousto-optic grating period adjustment.

Description

technical field [0001] The invention relates to the fields of laser sensing, laser radar and photoelectric detection, in particular to an integrated laser scanner based on an arrayed waveguide grating and an acousto-optic modulation grating. Background technique [0002] With the development of autonomous driving technology, the importance of lidar has become increasingly prominent. Lidar senses the position of surrounding objects by actively scanning and receiving reflected light signals, and provides judgment basis for autonomous driving. The integrated laser scanner has the advantages of small size, light weight and convenient adjustment, and is an important research direction of lidar. [0003] In the existing literature, when a grating array is used to achieve beam deflection, the deflection perpendicular to the direction of the waveguide array is realized by adjusting the phase of multiple optical paths, but this scheme needs to drive a large number of electrodes to co...

AI Technical Summary

Problems solved by technology

[0003] In the existing literature, when the grating array is used to realize the beam deflection, the deflection perpendicular to the direction of the waveguide array is realized by adjusting the phase of multiple optical paths, but this scheme needs to drive a large number of electrodes to control the phase of each optical path; when using The stepped heater heats the waveguide array. Although only a pair of electrodes is needed to deflect the light beam in the direction perpendicular to the waveguide array, this scheme requires precise control of the optical phase difference between the output waveguides to generate a flat wavefront. Higher processing precision requirements for waveguide arrays and heaters

[0004] In addition, some technical solutions can only realize the deflection of the beam in the horizontal direction or the vertical direction. To realize the deflection in the horizontal direction and the vertical direction at the same time still need a large number of electrodes and control the optical phase difference between the output waveguides.

In addition to the large number of control electrodes, none of the existing solutions integrate laser light sources, requiring external light sources, and the system is huge

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