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公开(公告)号：US12009635B2
公开(公告)日：2024-06-11
申请号：US17057649
申请日：2019-05-07
Applicant: Google LLC
Inventor： Tao Zhang , Cedric Fung Lam , Xiangjun Zhao , Shuang Yin , Liang Du , Changhong Joy Jiang , Adam Edwin Taylor Ward Barratt , Claudio Desanti , Muthu Nagarajan
IPC: H01S5/0625 , H01S5/024 , H04B10/50 , H04B10/572 , H04J14/02
CPC classification number: H01S5/06256 , H01S5/02415 , H04B10/504 , H04B10/572 , H04J14/0282
Abstract: A method (600) for tuning a tunable laser (310) includes delivering a bias current (IDBR) to an anode of a distributed Bragg reflector (DBR) section diode (D2) 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.
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公开(公告)号：US11600965B2
公开(公告)日：2023-03-07
申请号：US17057651
申请日：2019-05-06
Applicant: Google LLC
Inventor： Tao Zhang , Cedric Fung Lam , Shuang Yin , Xiangjun Zhao , Liang Du , Changhong Joy Jiang , Adam Edwin Taylor Barratt , Claudio Desanti , Muthu Nagarajan
IPC: H01S5/042 , H01S5/026 , H01S5/0625 , H01S5/068 , H01S5/323 , H04B10/50 , H04B10/27 , H04B10/564
Abstract: A method (900) includes a gain current (IGAIN) to an anode of a gain-section diode (D0) disposed on a shared substrate of a tunable laser (310), delivering a modulation signal to an anode of an Electro-absorption section diode (D2) disposed on the shared substrate of the tunable laser, and receiving a burst mode signal (330) 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 gain current at 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 gain current and delivering an overshoot current (IOVER) to the anode of the gain-section diode.
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公开(公告)号：US20190215093A1
公开(公告)日：2019-07-11
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
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.
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公开(公告)号：US20190036302A1
公开(公告)日：2019-01-31
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 , H04J14/02 , H01S5/068 , H04B10/25 , H01S5/0625
CPC classification number: H01S5/042 , H01S5/0428 , H01S5/06256 , H01S5/068 , H01S5/125 , H01S5/3013 , H04B10/2503 , H04B10/40 , H04J14/0265 , H04J14/0282
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.
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公开(公告)号：US20230090500A1
公开(公告)日：2023-03-23
申请号：US17992208
申请日：2022-11-22
Applicant: Google LLC
Inventor： Massimiliano Salsi , Shuang Yin
IPC: H04B10/80 , G02B6/42 , G02B6/44 , 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.
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Patent Agency Ranking
公开(公告)号：US11594856B2
公开(公告)日：2023-02-28
申请号：US17057652
申请日：2019-05-07
Applicant: Google LLC
Inventor： Tao Zhang , Cedric Fung Lam , Shuang Yin , Xiangjun Zhao , Liang Du , Changhong Joy Jiang , Adam Edwin Taylor Barratt , Claudio Desanti , Muthu Nagarajan
IPC: H01S5/042 , H01S5/0625 , H01S5/068 , H01S5/323 , H04J4/00
Abstract: A method (900) includes delivering a first bias current (IGAIN) to an anode of gain-section diode (590a) and delivering a second bias current (IPH) to an anode of a phase-section diode (590b). The method also includes receiving a burst mode signal (514) indicative of a burst-on state or a burst-on state, and sinking a first sink current (ISINK) away from the first bias current when the burst mode signal is indicative of the burst-off state. When the burst mode signal transitions to be indicative of the burst-on state from the burst-off state, the method also includes sinking a second sink current away from the second bias current at the anode of the phase-section diode and ceasing the sinking of the first sink current away from the first bias current at the anode of the gain section diode.
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公开(公告)号：US11539448B2
公开(公告)日：2022-12-27
申请号：US17220526
申请日：2021-04-01
Applicant: Google LLC
Inventor： Massimiliano Salsi , Shuang Yin
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.
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公开(公告)号：US10992387B2
公开(公告)日：2021-04-27
申请号：US16568759
申请日：2019-09-12
Applicant: Google LLC
Inventor： Cedric Fung Lam , Xiangjun Zhao , Shuang Yin , Muthu Nagarajan , Tao Zhang , Liang Du , Adam Edwin Taylor Barratt , Changhong Joy Jiang , Claudio Desanti
Abstract: A method of combining optical signals from a plurality of optical fibers into a single optical signal includes receiving, at corresponding optical-signal receivers optically coupled to corresponding trunk fibers, respective optical signals. The method further 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 performing the following steps: converting, by the corresponding optical-signal receiver, the respective optical signal to a corresponding electrical signal; transmitting, by the corresponding optical-signal receiver, the corresponding electrical signal to a corresponding input channel of an electrical-multiplexing device; 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 configured to convert the corresponding electrical signal back to the respective optical signal.
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公开(公告)号：US20210083770A1
公开(公告)日：2021-03-18
申请号：US16568759
申请日：2019-09-12
Applicant: Google LLC
Inventor： Cedric Fung Lam , Xiangjun Zhao , Shuang Yin , Muthu Nagarajan , Tao Zhang , Liang Du , Adam Edwin Taylor Barratt , Changhong Joy Jiang , Claudio Desanti
Abstract: A method of combining optical signals from a plurality of optical fibers into a single optical signal includes receiving, at corresponding optical-signal receivers optically coupled to corresponding trunk fibers, respective optical signals. The method further 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 performing the following steps: converting, by the corresponding optical-signal receiver, the respective optical signal to a corresponding electrical signal; transmitting, by the corresponding optical-signal receiver, the corresponding electrical signal to a corresponding input channel of an electrical-multiplexing device; 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 configured to convert the corresponding electrical signal back to the respective optical signal.
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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
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.
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