公开(公告)号：US20190162986A1

公开(公告)日：2019-05-30

申请号：US16184495

申请日：2018-11-08

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Joong-Seon Choe ,  Chun Ju Youn ,  Heasin Ko ,  Kap-Joong Kim ,  Byung-seok Choi

IPC: G02F1/01 ,  G02F1/225 ,  H04L9/08

Abstract: Provided is an apparatus configured to split light into a plurality of polarizations, the apparatus including an input waveguide configured to receive the light, a first interferometer configured to split the light into a first polarization and a second polarization, and a second interferometer configured to split the light into a third polarization and a fourth polarization, wherein the first interferometer and the second interferometer are connected in parallel, the first interferometer comprises a first output waveguide configured to output the first polarization, and a second output waveguide configured to output the second polarization, and the second interferometer comprises a third output waveguide configured to output the third polarization, and a fourth output waveguide configured to output the fourth polarization.

公开(公告)号：US11860376B2

公开(公告)日：2024-01-02

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

CPC classification number: G02B27/283 ,  G02B27/286 ,  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：US11594656B2

公开(公告)日：2023-02-28

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 ,  H01L33/30 ,  H01L33/00 ,  H01L25/075

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.

公开(公告)号：US11770245B2

公开(公告)日：2023-09-26

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

CPC classification number: H04L9/0855 ,  H04L9/0825 ,  H04L9/0858

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：US11703638B2

公开(公告)日：2023-07-18

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

CPC classification number: G02B6/12004 ,  H04B10/502 ,  H04B10/503 ,  G02B2006/1215 ,  G02B2006/12121 ,  G02B2006/12123

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.