公开(公告)号：US12126387B2

公开(公告)日：2024-10-22

申请号：US18014052

申请日：2020-07-02

Applicant: LG ELECTRONICS INC.

Inventor： JaYeong Kim ,  Byungkyu Ahn ,  Sangrim Lee ,  Hojae Lee

IPC: H04B10/70 ,  H04B10/077 ,  H04L9/08

CPC classification number: H04B10/70 ,  H04B10/077 ,  H04L9/0852

Abstract: Provided are a device and a method performed by the device to correct an error in a quantum communication system. The method is characterized by comprising: transmitting a random access (RA) preamble to another device; receiving a random access response (RAR) from the other device as a response to the RA preamble; performing a radio resource control (RRC) connection procedure with the other device; and transmitting data to the other device, wherein the data is encoded on the basis of key information, the error is measured on the basis of a test pulse, and the key information is distributed to the device and the other device on the basis of the error being corrected using an improved Faraday rotator mirror of the device.

公开(公告)号：US20240291560A1

公开(公告)日：2024-08-29

申请号：US18113821

申请日：2023-02-24

Applicant: Ciena Corporation

Inventor： Choudhury A. Al Sayeed ,  Edward Chen ,  Robert Palmer ,  Ran Tang

IPC: H04B10/077 ,  H04J14/02

CPC classification number: H04B10/077 ,  H04J14/021

Abstract: A Reconfigurable Optical Add/Drop Multiplexer (ROADM) includes degree components where there are one or more Media Channels (MCs) configured thereon; multiplexer and demultiplexer components; and a controller configured to, responsive to a request for a loopback test on Network Media Channel (NMC) that is part of a configured Media Channel (MC), determine whether there are neighboring channels to the NMC, configure deadbands on optical spectrum based on the determining, cause configuration of a modem for the loopback test, and cause performance of the loopback test with the modem.

公开(公告)号：US20240223272A1

公开(公告)日：2024-07-04

申请号：US18148597

申请日：2022-12-30

Applicant: Cortina Access, Inc.

Inventor： Charles CHEN

IPC: H04B10/03 ,  H04B10/077

CPC classification number: H04B10/03 ,  H04B10/077

Abstract: A passive optical network (PON) includes at least one optical network unit (ONU) at a downstream end and an optical line terminal (OLT) at an upstream end. Each ONU is dynamically allocated with an upstream communication window. During a laser always on (LAO) detection process, when the OLT receives an optical signal from the downstream end within an upstream idle window, the OLT determines that an LAO problem exists. The upstream idle window does not overlap with any upstream communication window. An anomaly detection method for the PON includes: during the LAO detection process, when the OLT receives an optical signal from the downstream end within the upstream idle window, determining, by the OLT, the LAO problem exists. An OLT includes an optical transceiver unit that optically communicates with the downstream end and output a receiving state signal and a control unit that determines whether the LAO problem exists.

公开(公告)号：US11982849B2

公开(公告)日：2024-05-14

申请号：US17522337

申请日：2021-11-09

Applicant: Alpine Optoelectronics, Inc.

Inventor： Tongqing Wang ,  Xingyu Zhang ,  Dawei Zheng ,  Zhoufeng Ying

IPC: G02B6/42 ,  G02B6/293 ,  H04B10/077 ,  H04B10/50 ,  H04B10/66 ,  H04J14/02 ,  H04J14/04

CPC classification number: G02B6/4215 ,  G02B6/425 ,  H04B10/077 ,  H04B10/505 ,  H04B10/506 ,  H04B10/66 ,  H04J14/02 ,  H04J14/04 ,  G02B6/29343

Abstract: A method and system for locking the resonance frequency of ring resonators by using laser sources to emit a plurality of different wavelengths, applying a tagging signal to each of the wavelengths, multiplexing the tagged wavelengths using a wavelength division multiplexor, coupling the multiplexed tagged wavelengths onto a bus waveguide, detecting the multiplexed tagged wavelengths with a first photodetector disposed before a first ring resonator and a second photodetector disposed after a last ring resonator of a plurality of ring resonators, sending the signals detected by the first and second photodetector to a processor, which identifies and processes the tagging signals, generating a control signal for each ring resonator, by the processor and applying the control signals to phase shifters on each ring resonator of the plurality of ring resonators to tune and align the resonance wavelengths of the ring resonators with the wavelengths of the corresponding laser sources.

公开(公告)号：US11973532B2

公开(公告)日：2024-04-30

申请号：US17940269

申请日：2022-09-08

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yixiao Chen ,  Minghui Fan ,  Chuan Li

IPC: H04B10/073 ,  H04B3/32 ,  H04B10/077

CPC classification number: H04B10/077 ,  H04B3/32 ,  H04B10/073

Abstract: A co-cable probability detection method, including obtaining information about at least two first events and at least two second events, where the information about the at least two first events is obtained based on a first sounding signal in a first transmission medium, the information about the at least two second events is obtained based on a second sounding signal in a second transmission medium, the information about the first events indicates at least one cable segment on the first transmission medium, and the information about the second events indicates at least one cable segment on the second transmission medium, and obtaining, based on the information about the first events and the second events, a probability that the at least one cable segment on the first transmission medium and the at least one cable segment on the second transmission medium comprise a co-cable segment.

公开(公告)号：US11960042B2

公开(公告)日：2024-04-16

申请号：US17307991

申请日：2021-05-04

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra Ip ,  Yue-Kai Huang ,  Fatih Yaman

IPC: G01V1/22 ,  G01V1/38 ,  H04B10/077 ,  H04J14/02 ,  H04L7/00

CPC classification number: G01V1/226 ,  G01V1/38 ,  H04B10/077 ,  H04J14/02 ,  H04L7/0075

Abstract: Aspects of the present disclosure are directed to laser interferometric systems, methods, and structures exhibiting superior laser phase noise tolerance particularly in seismic detection applications wherein laser requirements are advantageously relaxed by employing a novel configuration wherein the same laser which generates an outgoing signal is coherently detected using the same laser as local oscillator and fiber turnarounds are employed that result in the cancellation and/or mitigation of undesired mechanical vibration.

公开(公告)号：US11916599B2

公开(公告)日：2024-02-27

申请号：US17683531

申请日：2022-03-01

Applicant: Huawei Technologies Co., Ltd.

Inventor： Enbo Zhou ,  Fang Jiang

IPC: H04J14/02 ,  H04B10/572 ,  H04B10/294 ,  H04B10/50 ,  H04B10/077

CPC classification number: H04B10/572 ,  H04B10/294 ,  H04B10/506 ,  H04B10/077 ,  H04J14/02 ,  H04J14/0276

Abstract: A wavelength tuning method and a related device, the method including receiving, by a remote optical module, a wavelength control signal from a central office terminal, where the wavelength control signal indicates a target wavelength tuned by the remote optical module, and where the wavelength control signal is loaded into a first optical service signal in a pilot tone manner, and tuning, by the remote optical module, an operating wavelength of the remote optical module based on the wavelength control signal.

公开(公告)号：US20230403080A1

公开(公告)日：2023-12-14

申请号：US18037519

申请日：2020-11-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Ryo IGARASHI ,  Ryo KOMA

IPC: H04B10/61 ,  H04B10/077 ,  H04L27/00

CPC classification number: H04B10/61 ,  H04B10/077 ,  H04L27/0014 ,  H04L2027/0026

Abstract: One aspect of the present invention is a receiving apparatus including a reception unit that receives signal light frequency-modulated by a signal obtained by adding a main signal and a control signal having a lower frequency than the main signal, and converts the signal light into an analog electric signal, and a processing unit that acquires a code sequence corresponding to the control signal on the basis of the analog electric signal, in which the processing unit includes a frequency offset amount acquisition unit that acquires a frequency offset amount of the signal light acquired on the basis of the analog electric signal, and a determination unit that determines the code sequence corresponding to the control signal on the basis of the frequency offset amount acquired by the frequency offset amount acquisition unit.

公开(公告)号：US11817907B2

公开(公告)日：2023-11-14

申请号：US17299447

申请日：2019-12-19

Applicant: NEC Corporation

Inventor： Shohei Yamaguchi

IPC: H04B10/07 ,  H04B10/572 ,  H04B10/077 ,  H04J14/02

CPC classification number: H04B10/572 ,  H04B10/077 ,  H04J14/0212

Abstract: To generate, in an optical transmission device, a response signal corresponding to executed control even when said optical transmission device does not comprise one or both of a main signal photoelectric conversion function and a main signal optical amplification function, an optical transmission device comprises: an extraction unit that outputs, from a first optical signal including a main signal and a control signal, a signal including control information included in the control signal; a control unit that executes control on the basis of the control information; and a response signal output unit that outputs, according to the control, a response signal in a wavelength band different from the main signal.

公开(公告)号：US20230318702A1

公开(公告)日：2023-10-05

申请号：US18024852

申请日：2021-09-07

Applicant: NEC Corporation

Inventor： Taiki Kanai

IPC: H04B10/077 ,  H04B10/032

CPC classification number: H04B10/077 ,  H04B10/032

Abstract: A failure detection apparatus for submarine optical cables having a redundant configuration, the apparatus comprising, with a view to detecting a failure in an active transmission path and a standby transmission path: a first optical coupler which branches and outputs a supervisory signal to the active transmission path and the standby transmission path; a second switch functional unit which outputs the supervisory signal outputted from either the active transmission path or the standby transmission path that is specified as a test transmission path; and a transmission path monitoring unit which, on the basis of the supervisory signal received from the second switch functional unit, detects a failure taking place in said test transmission path.