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    Single-fiber bidirectional optical ring system, method for controlling single-fiber bidirectional optical ring system, and central station
    2.
    发明授权
    Single-fiber bidirectional optical ring system, method for controlling single-fiber bidirectional optical ring system, and central station 有权

    公开(公告)号：US12184332B2

    公开(公告)日：2024-12-31

    申请号：US18162996

    申请日：2023-02-01

    Applicant: Mitsubishi Electric Corporation

    Inventor： Kazuyuki Ishida ,  Ayano Sakamoto ,  Satoshi Yoshima

    IPC: H04B10/275 ,  H04B10/25 ,  H04B10/40 ,  H04J14/02 ,  H04J14/04

    Abstract: A single-fiber bidirectional optical ring system includes: a central station; slave stations; and a network which connects the central station and the slave stations in a ring shape by optical fibers. The central station includes: a first single-fiber bidirectional optical transceiver connected in a clockwise direction of the network, which outputs a downstream optical signal of a second wavelength and receives an upstream optical signal of a first wavelength; a second single-fiber bidirectional optical transceiver connected in a counterclockwise direction of the network, which outputs a downstream optical signal of the second wavelength and receives an upstream optical signal of the first wavelength; and a first time synchronization control circuit that adjusts timings at which the downstream optical signals of the second wavelength are outputted, and causes the first and second single-fiber bidirectional optical transceivers to output the downstream optical signals of the second wavelength in different time slots.

    Optical communication system and optical communication method
    4.
    发明授权
    Optical communication system and optical communication method 有权

    公开(公告)号：US11956009B2

    公开(公告)日：2024-04-09

    申请号：US17911238

    申请日：2020-03-17

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Atsuko Kawakita ,  Yasutaka Kimura ,  Kazutaka Hara

    IPC: H04B10/275 ,  H04B10/032

    CPC classification number: H04B10/032 ,  H04B10/275

    Abstract: An object of the present invention is to provide an optical communication system and an optical communication method capable of achieving a long transmission distance with a passive element and obtaining redundancy of a ring topology.
    The optical communication system according to the present invention is a PON system having a ring configuration, in which an unequal branch optical splitter having a left-right symmetrical configuration is disposed in a trunk fiber wired in a loop shape. An OLT and an ONU have a configuration in which two sets of Tx (transmitter) and Rx (receiver) are mounted. Two sets of Tx (transmitters) and Rx (receivers) in each of a plurality of ONUs are respectively connected to left and right symmetrical ports of one unequally branched light beam SP.

    COMMUNICATION SYSTEM AND OLT SYSTEM
    6.
    发明公开
    COMMUNICATION SYSTEM AND OLT SYSTEM 审中-公开

    公开(公告)号：US20230146851A1

    公开(公告)日：2023-05-11

    申请号：US17907948

    申请日：2020-03-06

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Tomoya HATANO ,  Keita TAKAHASHI ,  Naotaka SHIBATA ,  Hiroko NOMURA

    IPC: H04B10/61 ,  H04B10/03 ,  H04B10/275

    CPC classification number: H04B10/614 ,  H04B10/03 ,  H04B10/275

    Abstract: A communication system of a passive optical communication network includes an optical line terminal (OLT) system including a first OLT, a second OLT, and an OLT control device that controls the first OLT and the second OLT, a plurality of splitters that connect the first OLT and the second OLT with an optical communication path, and an ONU that is connected to each of the splitters with an optical communication path. The splitter distributes and outputs an optical signal transmitted from the OLT system to the ONU connected to the splitter and a succeeding device that is another splitter or the OLT system, and the OLT control device determines a distribution ratio at the splitter, the distribution ratio indicating a ratio between the intensity of the optical signal distributed to the succeeding device and the intensity of the optical signal distributed to the ONU.

    Wavelength modulation for improved optical link bit error rate
    7.
    发明授权
    Wavelength modulation for improved optical link bit error rate 有权

    公开(公告)号：US11552707B2

    公开(公告)日：2023-01-10

    申请号：US17302681

    申请日：2021-05-10

    Applicant: Hewlett Packard Enterprise Development LP

    Inventor： Mir Ashkan Seyedi ,  Terrel Morris

    IPC: H04J14/00 ,  H04B10/275 ,  H04B10/40

    Abstract: An optical transceiver module includes an optical transceiver and a controller. The optical transceiver has a ring filter configured to transmit optical signals from or receive optical signals for the optical transceiver module. The controller is configured to: detect a carrier frequency at the optical transceiver; detect a data signal frequency of data at the optical transceiver; determine a bit error rate of the data; and in response to determining that the bit error rate of the data is greater than a threshold, periodically vary a central wavelength of the ring filter at a frequency at least three orders slower than the data signal frequency.

    Detecting and localizing acoustic signals with an optical network
    8.
    发明申请
    Detecting and localizing acoustic signals with an optical network 有权

    公开(公告)号：US20220417672A1

    公开(公告)日：2022-12-29

    申请号：US17358558

    申请日：2021-06-25

    Applicant: Ciena Corporation

    Inventor： Petar Djukic ,  Yinqing Pei ,  Maryam Amiri

    IPC: H04R23/00 ,  H04B10/61 ,  H04B10/25 ,  H04B10/275

    Abstract: An optical network element includes a connection to an optical fiber in an optical line system including a coherent receiver; a microphone configured to detect sound; and circuitry connected to the microphone and configured to cause transmission of information related to sounds detected by the microphone to a receiver at an end of the optical line system, wherein the transmission is over the optical fiber in the optical line system to the coherent receiver. The optical network element can include a polarization controlling device connected to the circuitry and configured to modulate a state-of-polarization (SOP) envelope for the transmission.

    Communication device, communication system, communication apparatus, and communication method
    10.
    发明授权
    Communication device, communication system, communication apparatus, and communication method 有权

    公开(公告)号：US10892844B2

    公开(公告)日：2021-01-12

    申请号：US16487906

    申请日：2018-03-16

    Applicant: NEC Corporation

    Inventor： Tetsuya Yamamoto

    IPC: H04J14/02 ,  H04B10/275 ,  H04B10/40

    Abstract: In order to enable more stable monitoring of communication status, a communication device is provided with: a setting unit which sets a first wavelength selected from wavelength selection alternatives included in wavelengths of light included in dummy light, and a first transmission power which is selected in accordance with a first communication status from a plurality of transmission power selection alternatives that are set in advance; a generation unit which generates light of the first wavelength from the dummy light; an adjustment unit which adjusts the light of the first wavelength to first light of the first transmission power; and a multiplexing unit which multiplexes the first light with communication light serving as light for a predetermined communication so as not to overlap each other on the time axis, and which delivers the multiplexed light to another communication device.

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