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：US20210306077A1

公开(公告)日：2021-09-30

申请号：US17203186

申请日：2021-03-16

Applicant: Electronics and Telecommunications Research Institute

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

IPC: H04B10/70 ,  H04L9/08

Abstract: Disclosed are a quantum information transmitter, a quantum communication system including the same, and an operating method of the quantum information transmitter. The quantum information transmitter includes a light source driver, a light source, and a light modulator. The light source driver generates a first light source driving signal having a first level and a second light source driving signal having a second level. The light source generates a first light signal having a first average number of photons in response to the first light source driving signal, and generates a second light signal having a second average number of photons in response to the second light source driving signal. The optical modulator modulates the first light signal to generate a target signal, and modulates the second light signal to generate a decoy signal.

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：US20230283459A1

公开(公告)日：2023-09-07

申请号：US17937325

申请日：2022-09-30

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kyongchun LIM ,  Chun Ju YOUN ,  Joong-Seon CHOE ,  Minchul KIM ,  Byung-seok CHOI

IPC: H04L9/08

CPC classification number: H04L9/0852

Abstract: A quantum key distribution system using an RFI (reference frame independent) QKD (quantum key distribution) protocol includes a quantum channel transmitter that generates a first quantum signal including quantum information and provides the first quantum signal to an external device through a quantum channel, a first public channel transceiver that generates an optical signal including first additional information related to a QKD operation, and transmits and receives the optical signal through a public channel, a second public channel transceiver that receives the optical signal through the public channel and generates a measurement result by measuring a circular polarization component of the optical signal, and a quantum channel receiver that receives the first quantum signal through the quantum channel, generates a second quantum signal by correcting a polarization distortion of the first quantum signal based on the measurement result, and demodulates the quantum information from the second quantum signal.

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.