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    SWITCHING CIRCUIT FOR BURST-MODE TUNABLE LASER
    1.
    发明申请
    SWITCHING CIRCUIT FOR BURST-MODE TUNABLE LASER 审中-公开

    公开(公告)号：WO2019226338A1

    公开(公告)日：2019-11-28

    申请号：PCT/US2019/031142

    申请日：2019-05-07

    Applicant: GOOGLE LLC

    Inventor： ZHANG, Tao ,  LAM, Cedric, Fung ,  ZHAO, Xiangjun ,  YIN, Shuang ,  DU, Liang ,  JIANG, Changhong, Joy ,  BARRATT, Adam, Edwin, Taylor ,  DESANTI, Claudio ,  NAGARAJAN, Muthu

    IPC: H01S5/042 ,  H01S5/0625

    Abstract: A method (600) for tuning a tunable laser (310) includes delivering a bias current (I DBR ) to an anode of a distributed Bragg reflector (DBR) section diode (D 2 ) disposed on a shared substrate of the tunable laser and receiving a burst mode signal (440) indicative of a burst-on state or a burst-off state. When the burst mode signal is indicative of the burst-off state, the method includes offsetting the bias current at the anode of the DBR section diode by one of sourcing a push current with the bias current to the anode of the DBR section diode or sinking a pull current away from the bias current at the anode of the DBR section diode. When the burst mode signal is indicative of the burst-on state, the method also includes ceasing any offsetting of the bias current at the anode of the DBR section diode.

    PORT REPLICATOR
    3.
    发明申请
    PORT REPLICATOR 审中-公开

    公开(公告)号：WO2021050785A1

    公开(公告)日：2021-03-18

    申请号：PCT/US2020/050268

    申请日：2020-09-10

    Applicant: GOOGLE LLC

    Inventor： LAM, Cedric, Fung ,  ZHAO, Xiangjun ,  YIN, Shuang ,  NAGARAJAN, Muthu ,  ZHANG, Tao ,  DU, Liang ,  BARRATT, Adam Edwin, Taylor ,  JIANG, Changhong, Joy ,  DESANTI, Claudio

    IPC: H04B10/272 ,  H04B10/29 ,  H04Q11/00

    Abstract: A method (600) of combining optical signals (104) from a plurality of optical fibers into a single optical signal includes receiving, at corresponding optical-signal receivers (305) optically coupled to corresponding trunk fibers, respective optical signals. 'The method includes determining, by the corresponding optical-signal receivers, when each respective optical signal is received. When the respective optical signal is received, the method includes: converting, by the corresponding optical-signal receiver, the respective optical signal to a corresponding electrical signal (310); transmitting, by the corresponding optical-signal receiver, the corresponding electrical signal to a corresponding input channel (318) of an electrical -multiplexing device (316), and configuring the electrical-multiplexing device to select the corresponding input channel. Configuring the electrical-multiplexing device to select the corresponding input channel causes the electrical -multiplexing device to transmit the corresponding electrical signal to an electro-optical converter (340) configured to convert the corresponding electrical signal back to the respective optical signal.

    COMMON CATHODE LASER DRIVING CIRCUIT
    5.
    发明申请
    COMMON CATHODE LASER DRIVING CIRCUIT 审中-公开

    公开(公告)号：WO2018236419A1

    公开(公告)日：2018-12-27

    申请号：PCT/US2018/012747

    申请日：2018-01-08

    Applicant: GOOGLE LLC

    Inventor： ZHANG, Tao ,  DU, Liang ,  ZHAO, Xiangjun ,  JIANG, Changhong, Joy ,  LAM, Cedric, Fung ,  YIN, Shuang ,  BARRATT, Adam, Edwin, Taylor

    IPC: H01S5/042 ,  H01S5/0625 ,  H04J14/02 ,  H04B10/25

    Abstract: A method (700) for biasing a tunable laser (310) during burst-on and burst-off states through a common-cathode laser driving circuit (400) includes delivering a bias current (IBIAS) to an anode of a gain-section diode (402) having a shared substrate with the laser, and receiving a burst mode signal indicative of a burst-on state or a burst-off state. When the burst mode signal is indicative of the burst-off state, the method includes sinking a sink current (ISINK) away from the anode of the gain-section diode. The sink current is less than the bias current delivered to the anode of the gain-section diode. When the burst mode signal transitions to be indicative of the burst-on state from the burst-off state, the method includes ceasing the sinking of the sink current away from the anode of the gain-section diode, and delivering an overshoot current (IOVER) to the anode of the gain-section diode to accelerate heating of the gain-section diode.

    IN-FIELD CALIBRATION OF LASER TRANSMITTER
    6.
    发明申请
    IN-FIELD CALIBRATION OF LASER TRANSMITTER 审中-公开

    公开(公告)号：WO2020242519A1

    公开(公告)日：2020-12-03

    申请号：PCT/US2019/062818

    申请日：2019-11-22

    Applicant: GOOGLE LLC

    Inventor： ZHAO, Xiangjun ,  SIVAGNANASUNTHARAM, Satrukaan ,  YIN, Shuang ,  LAM, Cedric, Fung ,  DU, Liang

    IPC: H04J14/02 ,  H04B10/079

    Abstract: A method (400) for in-field calibration of a laser transmitter includes receiving, at an optical network unit (ONU) (140), a downstream connection (310) from an optical line terminal (OLT) (120) where the ONU includes a Distributed Bragg Reflector (DBR) laser (200). The method further includes attempting to establish an upstream connection (320) 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 (312) 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 (212) for the DBR laser.

    ULTRA-WIDEBAND RANGING METHOD AND DEVICE
    7.
    发明申请
    ULTRA-WIDEBAND RANGING METHOD AND DEVICE 审中-公开

    公开(公告)号：WO2023022708A1

    公开(公告)日：2023-02-23

    申请号：PCT/US2021/046318

    申请日：2021-08-17

    Applicant: GOOGLE LLC

    Inventor： LIU, Liping ,  KRAHN, Darren, David ,  ZHAO, Xiangjun ,  ZHANG, Ning ,  WANG, Jian ,  PIUS, Roshan

    IPC: H04W12/0471 ,  H04W4/02 ,  H04L9/40 ,  G01S13/02 ,  G01S13/76 ,  G01S5/02

    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.

    TUNABLE LASER BIAS CIRCUIT
    8.
    发明申请
    TUNABLE LASER BIAS CIRCUIT 审中-公开

    公开(公告)号：WO2019089091A1

    公开(公告)日：2019-05-09

    申请号：PCT/US2018/037603

    申请日：2018-06-14

    Applicant: GOOGLE LLC

    Inventor： BARRATT, Adam Edwin Taylor ,  JIANG, Changhong Joy ,  LAM, Cedric Fung ,  YIN, Shuang ,  ZHANG, Tao ,  DU, Liang ,  ZHAO, Xiangjun

    IPC: H01S5/042

    Abstract: A method (700) includes receiving a mode control signal (530) indicative of a current-mode or a voltage-mode. When the mode control signal is indicative of the voltage-mode, the method includes connecting a voltage-mode bias sub-circuit (500c) to an anode of a reflector-section diode (402) and applying an adjustable bias current (552) to bias a diode voltage (502) at the anode of the reflector-section diode. The reflector- section diode is disposed on a shared substrate of a tunable laser (400). When the mode control signal is indicative of the current-mode, the method includes connecting a current-mode bias sub-circuit (500b) to the anode of the reflector-section diode and delivering an adjustable bias current (554) to the anode of the reflector-section diode.

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