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    Ultra-Wideband Ranging Method and Device
    12.
    发明申请
    Ultra-Wideband Ranging Method and Device 有权

    公开(公告)号：US20240381053A1

    公开(公告)日：2024-11-14

    申请号：US18294042

    申请日：2021-08-17

    Applicant: Google LLC

    Inventor： Liping Liu ,  Darren David Krahn ,  Xiangjun Zhao ,  Ning Zhang ,  Jian Wang ,  Roshan Pius

    IPC: H04W4/02 ,  G01S13/02 ,  G01S13/08 ,  G01S13/76 ,  H04L9/40 ,  H04W4/80

    Abstract: An ultra-wideband (UWB) ranging method comprises determining, by a first device, that the first device is within proximity of a second device. Responsive to the determination, the first device negotiates a value to use as a UWB session key for securing UWB communications with the second device. The negotiation occurs via a communication protocol different from a UWB communication protocol. The first device controls a UWB subsystem therein to encrypt information communicated via the UWB subsystem based on the negotiated value of the UWB session key instead of a default value for the UWB session key that is specified in the UWB communication protocol. The information facilitates determining the distance between the first device and the second device.

    In-field calibration of laser transmitter
    19.
    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.

    Feeder fiber and central office redundancy
    20.
    发明授权
    Feeder fiber and central office redundancy 有权

    公开(公告)号：US10516479B1

    公开(公告)日：2019-12-24

    申请号：US16554477

    申请日：2019-08-28

    Applicant: Google LLC

    Inventor： Liang Du ,  Yut Loy Chan ,  Xiangjun Zhao ,  Changhong Joy Jiang ,  Cedric Fung Lam ,  Daoyi Wang ,  Tao Zhang

    IPC: H04B10/25 ,  H04J14/02

    Abstract: A remote node includes a first node input, a second node input, and an optical switch. The optical switch includes a first switch input optically coupled to the first node input, a second switch input optically coupled to the second node input, a first switch output switchably coupled to the first switch input or the second switch input, and a second switch output switchably coupled to the first switch input or the second switch input. The remote node includes a photodiode optically coupled to the second switch output, and a capacitor electrically coupled to the photodiode and the optical switch. When the first switch input is switchably coupled to the first switch output, the second switch input is switchably coupled to the second switch output. Light received by the second switch input passes out the second switch output to the photodiode. The photodiode charges the capacitor to a threshold charge.

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