Photon time broadening laser radar system based on microcavity optical comb

Abstract

The embodiment of the invention provides a photon time broadening laser radar system based on a microcavity optical comb, and the system comprises a broadband light source which is used for generating an optical signal with a plurality of wavelengths, and transmitting the optical signal to a spectrum-time modulator, the spectrum-time modulator used for performing spectrum-time coding on the optical signal to generate a first optical pulse sequence and sending the first optical pulse sequence to an optical amplifier, the optical amplifier used for amplifying a first optical pulse sequence to obtain a second optical pulse sequence, a spatial light emitting unit used for performing spatial dispersion separation on the second optical pulse sequence and emitting the second optical pulse sequence to a detection target, and a photoelectric detector used for calculating depth information of the detection target according to the echo pulse sequence. According to the embodiment of the invention, high-resolution detection of the laser radar is realized, high-capacity multiplexing and higher integration level are realized at the same time, ambiguity of mapping among wavelength, time and space three-dimensional information in laser radar imaging is eliminated, and the cost of a receiver is reduced.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a photon time stretching laser radar system based on a microcavity optical comb. Background technique [0002] The need for imaging and ranging, along with emerging areas such as advanced driver assistance systems, intelligent interaction, and robotics, has pushed lidar to the forefront of consumer technology. Based on the solid-state solution, laser radar is mainly divided into two types according to different measurement principles: 1. Coherent laser radar, through linear chirp modulation on the center frequency of the emitted light, can be compared with the local oscillator signal after receiving the echo signal Doing heterodyne detection to measure the position and velocity information of the detection target, because it is only limited by shot noise in theory, it is more suitable for real-time imaging of long-distance complex background targets than direct measurement, b...

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Problems solved by technology

[0004] However, the existing photonic time stretching lidar system is composed of optical fiber discrete components, which cannot meet the requirements of system integration and low power consumption

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