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    Common cathode laser driving circuit
    11.
    发明授权
    Common cathode laser driving circuit 有权

    公开(公告)号：US10461498B2

    公开(公告)日：2019-10-29

    申请号：US16148526

    申请日：2018-10-01

    Applicant: Google LLC

    Inventor： Tao Zhang ,  Liang Du ,  Xiangjun Zhao ,  Changhong Joy Jiang ,  Cedric Fung Lam ,  Shuang Yin ,  Adam Edwin Taylor Barratt

    IPC: H01S5/042 ,  H01S5/068 ,  H01S5/0625 ,  H04J14/02 ,  H04B10/40 ,  H04B10/25 ,  H01S5/125 ,  H01S5/30

    Abstract: A method for biasing a tunable laser during burst-on and burst-off states through a common-cathode laser driving circuit includes delivering a bias current to an anode of a gain-section diode 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 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 to the anode of the gain-section diode to accelerate heating of the gain-section diode.

    In-field calibration of laser transmitter
    16.
    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
    17.
    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.

    Feeder fiber and central office redundancy
    18.
    发明授权
    Feeder fiber and central office redundancy 有权

    公开(公告)号：US10439722B2

    公开(公告)日：2019-10-08

    申请号：US16038122

    申请日：2018-07-17

    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 carrier office includes an optical line terminal, a first transmit-erbium-doped fiber amplifier (EDFA), and a second transmit-EDFA. The OLT is configured to transmit first and second optical signals. The first transmit-EDFA is optically coupled to the OLT and a first feeder fiber, and the first feeder fiber is optically coupled to a first remote node (RN). The first transmit-EDFA is operable between a respective enabled state and a respective disabled state. The second transmit-EDFA is optically coupled to the OLT and a second feeder fiber, and the second feeder fiber is optically coupled to a second RN. The second transmit-EDFA is operable between a respective enabled state and a respective disabled state.

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