公开(公告)号：US20210302577A1

公开(公告)日：2021-09-30

申请号：US16839277

申请日：2020-04-03

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hyo-Hoon PARK ,  Hyeonho YOON ,  Nam-Hyun KWON ,  Kyeongjin HAN ,  Hyun-Woo RHEE ,  Geum-Bong KANG

IPC: G01S17/32 ,  G01S7/481 ,  G01S7/4913

Abstract: A silicon phased array based LiDAR device that measures a distance using a quasi-frequency modulation is disclosed. A LiDAR device according to an exemplary embodiment of the inventive concept includes a light source that generates an optical signal, an optical modulator that generates a first optical signal having a quasi-frequency whose a modulation frequency constantly varies with time by modulating a light intensity of the optical signal, an optical splitter that splits optical power of the first optical signal into a reference optical signal and a transmit (Tx) optical signal, an optical transmitter that receives and emits the Tx optical signal toward an object, an optical receiver that receives a receive (Rx) optical signal reflected from the object and transfers the Rx optical signal, an optical coupler that mixes the reference optical signal and the Rx optical signal, a balanced photodetector that detects an intermediate frequency from the optical signal transferred from the optical coupler and a distance calculator that obtains distance information by measuring the intermediate frequency.