公开(公告)号：US20250164710A1

公开(公告)日：2025-05-22

申请号：US18646356

申请日：2024-04-25

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Joong-Seon CHOE ,  Kap-Joong KIM ,  Dong Churl KIM ,  Minchul KIM ,  Ju Hee BAEK ,  Chun Ju YOUN ,  Kyongchun LIM ,  Byung-seok CHOI

IPC: G02B6/42

Abstract: Provided are an optical alignment device and an optical alignment method. The optical alignment device includes an input optical fiber, a light source provided at one terminal of the input optical fiber to generate input light, an input stage provided at another terminal of the input optical fiber, an output stage spaced apart from the input stage, a stage driving control unit configured to control driving of the input and output stages, a camera configured to receive output light generated from the input light by the waveguide chip and detect a waveguide mode, an output optical fiber having one terminal connected to the output stage, an optical power meter configured to detect an intensity of the output light, and a system controller configured to determine the waveguide mode and the intensity of the output light.

公开(公告)号：US20220066245A1

公开(公告)日：2022-03-03

申请号：US17464470

申请日：2021-09-01

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kap-Joong KIM ,  Chun Ju YOUN ,  Young-Ho KO ,  Minchul KIM ,  Kyongchun LIM ,  Byung-Seok CHOI ,  Joong-Seon CHOE

IPC: G02F1/035 ,  G02F1/01

Abstract: Provided is a light modulation device includes a substrate, a lower clad layer disposed on the substrate, a core layer disposed on the lower clad layer to extend in a first direction which is parallel to a top surface of the substrate, and an upper clad layer covering the core on the lower clad layer. The core layer includes a waveguide layer extending in the first direction; and photonic crystal structures disposed in the waveguide layer and periodically arranged along the first direction.

公开(公告)号：US20190353918A1

公开(公告)日：2019-11-21

申请号：US16415708

申请日：2019-05-17

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kap-Joong KIM ,  Chun Ju YOUN ,  Heasin KO ,  Byung-Seok CHOI ,  Joong-Seon CHOE

IPC: G02B27/28 ,  H04K1/08

Abstract: Provided is a polarization decomposition device. The polarization decomposition device includes a polarization beam splitter configured to split an optical signal into a first polarized light having a first polarization direction and a second polarized light having a second polarization direction different from the first polarized light, a phase shifter configured to delay a phase of the first polarized light, a polarization rotator configured to rotate the second polarized light so that the polarization direction of the second polarized light is changed, and an interference beam splitter configured to allow the first polarized light in which the phase is delayed and the second polarized light in which the polarization direction is rotated to interfere with each other and split them into a third polarized light and a fourth polarized light.

公开(公告)号：US20230361884A1

公开(公告)日：2023-11-09

申请号：US18312995

申请日：2023-05-05

Applicant: Electronics and Telecommunications Research Institute

Inventor： Minchul KIM ,  Chun Ju YOUN ,  Kap-Joong KIM ,  Kyoungchun LIM ,  Byung Seok CHOI ,  Joong-Seon CHOE

IPC: H04B10/70 ,  H04B10/11

CPC classification number: H04B10/70 ,  H04B10/11

Abstract: Provided are a beam tracking module, a free-space quantum communication device, and a free-space optical communication device. The beam tracking module for free-space quantum communication includes a controller configured to determine a divergence angle of a reference beam on the basis of divergence angle control data, a beam path control optical part configured to output the reference beam, and a beam transmitter configured to adjust the divergence angle through the beam path control optical part so that the reference beam having the determined divergence angle is output.

公开(公告)号：US20220141008A1

公开(公告)日：2022-05-05

申请号：US17488955

申请日：2021-09-29

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kyongchun LIM ,  Chun Ju YOUN ,  Byung-seok CHOI ,  Young-Ho KO ,  Kap-Joong KIM ,  Minchul KIM ,  Ju Hee BAEK ,  Joong-Seon CHOE

IPC: H04L9/08

Abstract: Disclosed is a quantum key distribution system using an RFI (reference frame independent) QKD (quantum key distribution) protocol, which includes a first signal processing circuit that generates transmission basis information and transmission bit information, a quantum channel transmitter that generates a single photon or coherent light, and modulates the single photon or the coherent light based on the transmission basis information and the transmission bit information to generate a quantum signal, a quantum channel receiver that receives the quantum signal through a quantum channel and detects reception bit information from the quantum signal based on reception basis information, and a second signal processing circuit that generates the reception basis information, transmits the reception basis information to the first signal processing circuit through a public channel, and receives the transmission basis information from the first signal processing circuit through the public channel.

公开(公告)号：US20220171124A1

公开(公告)日：2022-06-02

申请号：US17513820

申请日：2021-10-28

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Young-Ho KO ,  Kap-Joong KIM ,  Hye Min KIM ,  Mireu LEE

IPC: G02B6/12 ,  H04B10/50

Abstract: Provided are a single-photon source device and a single-photon source system including same. The single-photon source device includes a substrate, a straight waveguide extending in a first direction on the substrate, a first coupling layer which is provided on the straight waveguide and has a first point defect, at least one first electrode which is adjacent to the first point defect and provided on the first coupling layer, a ring waveguide which is adjacent to the straight waveguide and provided on the substrate, and at least one second electrode provided on the ring waveguide.

公开(公告)号：US20210119076A1

公开(公告)日：2021-04-22

申请号：US17075966

申请日：2020-10-21

Applicant: Electronics and Telecommunications Research Institute

Inventor： Young-Ho KO ,  Kap-Joong KIM ,  Byung-seok CHOI ,  Won Seok HAN

IPC: H01L33/06 ,  H01L33/40 ,  H01L33/10 ,  H01L25/075 ,  H01L33/00 ,  H01L33/30

Abstract: Disclosed are a quantum light source and an optical communication apparatus including the same. The quantum light source device includes a vertical reflection layer disposed on a substrate, a lower electrode layer disposed on the vertical reflection layer, a horizontal reflection layer disposed on the lower electrode layer, a quantum light source disposed in the horizontal reflection layer, and an upper electrode layer disposed on the horizontal reflection layer.