Integrated two-dimensional multi-beam lidar transmitter based on butler matrix

US11874362B2 · kind B2 · utility

Assignee

• Shanghai Jiao Tong University · CN

Inventors

• Liangjun LU · Shanghai, CN
• Chen Zhu · Lo Wu, CN
• Linjie Zhou · Shanghai, CN
• Jiao Liu · Shanghai, CN
• Jianping Chen · Shanghai, CN

Key dates

• Filing date: Oct 1, 2020
• Grant date: Jan 16, 2024
• Expiry date: Nov 5, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/29395
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Integrated two-dimensional multi-beam LiDAR transmitter based on the Butler matrix, comprising an tunable laser array, a frequency modulated continuous wave modulator array, an N×N Butler optical matrix network, an N×M optical beam expanding network, an M-path phase shifter array, and an M-path two-dimensional LiDAR emitters. N-path narrow linewidth continuous light output by the tunable laser array passes through the frequency modulated continuous wave modulator array to generate N-path frequency modulated continuous light signals; after processed by the N×N Butler matrix and the N×M optical beam expanding network, energy of each path of the frequency modulated continuous optical signal is evenly distributed to the M-path output ports, and the M-path phase shifter array generates equal-difference phases with continuously tunable phase differences for M-path optical signals, which, with continuously tunable phase differences, are transmitted by M-path two-dimensional LiDAR emitters to realize no more than N different two-dimensional steerable transmitting optical beams.