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.

公开(公告)号：US20230350216A1

公开(公告)日：2023-11-02

申请号：US17796534

申请日：2020-01-31

Applicant: LG ELECTRONICS INC. ,  KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Byounggoo LEE ,  Sangcheon KIM ,  Hyohoon PARK ,  Hyeonho YOON ,  Joonsup SHIM ,  Youngin KIM

IPC: G02B27/09 ,  G02B27/00

CPC classification number: G02B27/0966 ,  G02B27/0087

Abstract: An optical device can include an end-fire optical phased array including an optical splitter to split an optical signal into a plurality of channels, an optical phase controller to control a phase of the optical signal transmitted from the optical splitter, and an end-fire optical radiator to radiate the optical signal transmitted from the optical phase controller. A lens can be further positioned on a path of the radiated optical signal to control a vertical divergence angle of the radiated optical signal.

公开(公告)号：US20230152453A1

公开(公告)日：2023-05-18

申请号：US18155064

申请日：2023-01-17

Applicant: WAY OPTICS CO., LTD. ,  KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yong Tae LEE ,  Mid Eum BAEK ,  Chang Su LEE ,  Hyo-Hoon PARK ,  Hyeonho YOON ,  Jae-Yong KIM

IPC: G01S17/26 ,  G02F1/29 ,  G01S7/481 ,  G02B6/125

CPC classification number: G01S17/26 ,  G02F1/292 ,  G01S7/4816 ,  G02B6/125

Abstract: An optical phased array device for a LIDAR sensor includes: a light source configured to irradiate a laser beam having a predetermined wavelength band; an input waveguide through which the laser beam irradiated from the light source passes; a slab waveguide disposed at an output end of the input waveguide to branch an optical signal input from the input waveguide; and a channel waveguide configured to distribute and guide the optical signal, branched by the slab waveguide, to M channels and to radiate the optical signal onto a free space. The channel waveguide may include a silia optical waveguide disposed for each of the M channels, and a length of each of the optical waveguides has a length difference ΔL from an adjacent waveguide.

公开(公告)号：US20210293959A1

公开(公告)日：2021-09-23

申请号：US16830869

申请日：2020-03-26

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hyo-Hoon PARK ,  Hyeonho YOON ,  Nam-Hyun KWON ,  Kyeongjin HAN

IPC: G01S17/26 ,  G01S7/487 ,  G01S7/481

Abstract: A LiDAR device is disclosed that measures a distance based on self-heterodyne detection using coherence. According to an embodiment, the LiDAR device includes a light generator that generates a coherent transmission light source having a first frequency at a specific interval and delivers a time when frequency modulation into the first frequency is performed to a distance measurement circuit, an optical transmitter that delivers the transmission light source, delivered from the light generator, to an optical heterodyne detector and radiates the transmission light source to an object of the free space, an optical receiver that receives a reception light source where the transmission light source is reflected from the object, the optical heterodyne detector that outputs an electrical signal of a beat frequency based on the transmission light source delivered from the light generator and the reception light source delivered from the optical receiver, and the distance measurement circuit that measures a distance to the object based on the electrical signal of the beat frequency delivered from the optical heterodyne detector and the frequency modulation time delivered from the light generator.