OPTICAL INTEGRATED CIRCUIT, AND OPTICAL PHASED ARRAY AND LiDAR SENSOR WHICH USE SAME

Abstract

Provided is an optical integrated circuit which gives an optical phase shift to a plurality of channels, and achieves reductions in the wavelength dependence and temperature dependence of a phase difference between adjacent channels without complicating phase control. This optical integrated circuit is provided with: a bus waveguide which is configured by an optical waveguide formed on a substrate, and through which input light propagates; a plurality of optical couplers which are disposed on the bus waveguide and each extract part of the light propagating through the bus waveguide; a plurality of waveguide lines through which light extracted by each of the plurality of optical couplers propagates; and a phase shifters each provided on the bus waveguide between the optical couplers adjacent along the bus waveguide, and is configured such that optical path lengths from an optical input end of the bus waveguide to optical output ends of the respective waveguide lines are equal to each other.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an optical integrated circuit and an optical phased array and a LiDAR sensor using the optical integrated circuit. Background technique [0002] LiDAR (Light Detection and Ranging lidar) sensors are used for remote sensing and distance measurement, for example, in automatic driving systems, etc., for real-time three-dimensional mapping and object detection, tracking, and determination. [0003] The LiDAR sensor scans the laser beam in the observation space and irradiates the object in the space, and receives the reflected return light generated by the irradiated beam scattered and reflected on the surface of the object through the light receiving sensor. Then, the position and distance of the object are measured by measuring the time of flight (TOF, Time of Flight) of the light from the irradiation of the laser beam to the reception of the reflected return light and t...

AI Technical Summary

Problems solved by technology

That is, in this device, the phase shift amount of each channel cannot be individually controlled

Therefore, in the case where additional phase shifts caused by changes in the wavelength of input light or changes in ambient temperature are generated in mutually different amounts in a plurality of channels within the same group as described above, it is not possible to accurately determine all of them, respectively. make compensation

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