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    Optical communication system and optical communication method
    2.
    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

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    发明人： Atsuko Kawakita ,  Yasutaka Kimura ,  Kazutaka Hara

    IPC分类号： H04B10/275 ,  H04B10/032

    CPC分类号： H04B10/032 ,  H04B10/275

    摘要： 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
    4.
    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

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    发明人： Tomoya HATANO ,  Keita TAKAHASHI ,  Naotaka SHIBATA ,  Hiroko NOMURA

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

    CPC分类号： H04B10/614 ,  H04B10/03 ,  H04B10/275

    摘要： 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
    5.
    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

    申请人： Hewlett Packard Enterprise Development LP

    发明人： Mir Ashkan Seyedi ,  Terrel Morris

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

    摘要： 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
    6.
    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

    申请人： Ciena Corporation

    发明人： Petar Djukic ,  Yinqing Pei ,  Maryam Amiri

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

    摘要： 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
    8.
    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

    申请人： NEC Corporation

    发明人： Tetsuya Yamamoto

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

    摘要： 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.

    OADM node and method in WDM system
    10.
    发明授权
    OADM node and method in WDM system 有权

    公开(公告)号：US10530515B2

    公开(公告)日：2020-01-07

    申请号：US15914716

    申请日：2018-03-07

    申请人： Huawei Technologies Co., Ltd.

    发明人： Ning Deng ,  Shiyi Cao ,  Jun Luo

    IPC分类号： H04J14/02 ,  H04B10/2581 ,  H04B10/275 ,  H04Q11/00

    摘要： A node in a wavelength division multiplexing (WDM) system is provided, which includes: a colorless optical transmitter, a first arrayed waveguide grating, a first waveband filter configured to divide an input optical signal into M sub-signals of different wavebands and output to a first optical switch, and a first optical coupler/a first optical combiner. A transmit end of the colorless optical transmitter is coupled to an input end of the first waveband filter via the first arrayed waveguide grating. The first optical switch is configured to connect an output end of the first waveband filter to an input end of the first optical coupler/the first optical combiner according to a control signal. An output end of the first optical coupler/the first optical combiner is coupled to an optical transmission path.