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    Submarine cable interface for connection to terrestrial terminals
    11.
    发明授权
    Submarine cable interface for connection to terrestrial terminals 有权

    公开(公告)号：US11942999B2

    公开(公告)日：2024-03-26

    申请号：US17992208

    申请日：2022-11-22

    Applicant: Google LLC

    Inventor： Massimiliano Salsi ,  Shuang Yin

    IPC: H02G15/14 ,  G02B6/42 ,  G02B6/44 ,  H04B10/035 ,  H04B10/80

    CPC classification number: H04B10/80 ,  G02B6/4278 ,  G02B6/4427 ,  H02G15/14 ,  H04B10/035

    Abstract: In an optical network having a terrestrial terminal and an open cable interface (OCI) connecting a submarine cable to a terrestrial cable, the OCI may include a filter positioned on an optical path between the terrestrial cable and the submarine cable and configured to pass first communication signals of a first frequency band, and filter out secondary signals of a second frequency band that does not overlap with the first frequency band. The secondary signals may be looped back to the terrestrial terminal. The terrestrial terminal may detect the looped back secondary signals, and in response, determine the presence of the OCI and that the supervisory signals were rerouted by the OCI.

    Optical network unit wavelength tuning
    13.
    发明授权
    Optical network unit wavelength tuning 有权

    公开(公告)号：US10666379B2

    公开(公告)日：2020-05-26

    申请号：US16351788

    申请日：2019-03-13

    Applicant: Google LLC

    Inventor： Xiangjun Zhao ,  Cedric Fung Lam ,  Shuang Yin ,  Changhong Joy Jiang ,  Ke Dong

    IPC: H04J14/02 ,  H04Q11/00

    Abstract: A method of establishing communication between an optical line terminal and an optical network unit within an optical access network includes receiving a signal indication from an optical transceiver of an optical line terminal. The signal indication includes: (i) a loss-of-signal indication indicating non-receipt of an upstream optical signal from the optical network unit; or (ii) a signal-received indication indicating receipt of the upstream optical signal from the optical network unit. The method includes determining whether the signal indication includes the loss-of-signal indication. When the signal indication includes the loss-of-signal indication, the method includes instructing the optical transceiver to cease signal transmission from the optical transceiver to the optical network unit. Moreover, when the signal indication includes the signal-received indication, the method includes instructing the optical transceiver to transmit a downstream optical signal from the optical transceiver to the optical network unit.

    Submarine Cable Interface For Connection to Terrestrial Terminals
    16.
    发明申请
    Submarine Cable Interface For Connection to Terrestrial Terminals 有权

    公开(公告)号：US20220321235A1

    公开(公告)日：2022-10-06

    申请号：US17220526

    申请日：2021-04-01

    Applicant: Google LLC

    Inventor： Massimiliano Salsi ,  Shuang Yin

    IPC: H04B10/80 ,  G02B6/42 ,  G02B6/44 ,  H04B10/035 ,  H02G15/14

    Abstract: In an optical network having a terrestrial terminal and an open cable interface (OCI) connecting a submarine cable to a terrestrial cable, the OCI may include a filter positioned on an optical path between the terrestrial cable and the submarine cable and configured to pass first communication signals of a first frequency band, and filter out secondary signals of a second frequency band that does not overlap with the first frequency band. The secondary signals may be looped back to the terrestrial terminal. The terrestrial terminal may detect the looped back secondary signals, and in response, determine the presence of the OCI and that the supervisory signals were rerouted by the OCI.

    In-field calibration of laser transmitter
    20.
    发明授权
    In-field calibration of laser transmitter 有权

    公开(公告)号：US10651946B1

    公开(公告)日：2020-05-12

    申请号：US16426193

    申请日：2019-05-30

    Applicant: Google LLC

    Inventor： Xiangjun Zhao ,  Satrukaan Sivagnanasuntharam ,  Shuang Yin ,  Cedric Fung Lam ,  Liang Du

    IPC: H04B10/08 ,  H04B10/572 ,  H04B10/079 ,  H04B10/27 ,  H04B10/50 ,  H04J14/02

    Abstract: A method for in-field calibration of a laser transmitter includes receiving, at an optical network unit (ONU), a downstream connection from an optical line terminal (OLT) where the ONU includes a Distributed Bragg Reflector (DBR) laser. The method further includes attempting to establish an upstream connection between the ONU and the OLT. When the ONU establishes the upstream connection to the OLT, the method also includes receiving, at the ONU, a message to initiate calibration of the ONU where the message is generated to indicate that the DBR laser is operating outside an operational state. The method further includes tuning, by the ONU, the DBR laser to the operational state by adjusting an injection current for the DBR laser.

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