An On-Chip Coherent Detection Scanning Coaxial Area Array Transceiver

Abstract

The invention discloses a scanning coaxial area array transceiver for on-chip coherent detection, comprising an optical switch array, a transceiver detection matrix and an electrical switch array; the optical switch array is composed of a 1xN optical switch and N 1xM beam splitters; The electric switch array is composed of M Nx1 electric switches and M analog-to-digital converters; the sending and receiving detection matrix is ​​composed of MxN pixel units, each pixel unit includes two-stage 2x2 beam splitters, and each pixel unit has both transmitting and receiving functions. , On-chip detection function. The present invention realizes direct detection at the pixel level on the chip by designing a two-stage 2x2 beam splitter structure of the pixel unit, thereby increasing the imaging rate; the present invention designs the optical switch array, the transceiver detection matrix and the electrical switch array to be implemented on different chips respectively, It is connected through a silicon interposer to achieve pure solid state, long life, more stable performance, small size, easy installation, and convenient mass production at reduced cost.

Description

technical field [0001] The invention belongs to the technical field of laser radar, in particular to a scanning coaxial area array transceiver for on-chip coherent detection. Background technique [0002] LiDAR is a sensor that uses laser light to detect and measure distances. Its principle is that the transmitting device emits laser light to the target, and the receiving device measures the delay and intensity of the returning laser light to measure the distance of the target. [0003] The current laser radar includes mechanical scanning laser radar, Flash laser radar, Mems scanning laser radar and OPA radar. The traditional mechanical laser radar uses a mechanical device to rotate and scan to obtain 360-degree point cloud information and construct a complete three-dimensional image. However, due to the slow mechanical scanning speed and low resolution, the obtained 3D image cannot completely present small objects. Secondly, the mechanical scanning laser radar is relativel...

AI Technical Summary

Problems solved by technology

[0003] The current laser radar includes mechanical scanning laser radar, Flash laser radar, Mems scanning laser radar and OPA radar. The traditional mechanical laser radar uses a mechanical device to rotate and scan to obtain 360-degree point cloud information and construct a complete three-dimensional image. However, due to the slow mechanical scanning speed and low resolution, the obtained 3D image cannot completely present small objects. Secondly, the mechanical scanning laser radar is relatively large in size and assembled with multiple wire harnesses, which leads to higher production costs; Flash LiDAR has a relatively short ranging distance, and the accurate measurement distance is 10M-20M. Mems scanning LiDAR has poor stability during use, and the Mems used cannot meet the vehicle regulations. The risk of long-term use is high, and the price of a single Mems is high; The manufacturing process of OPA radar is complicated, the yield rate is low, the price is expensive, and the progress of industrialization is slow

Images