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公开(公告)号：US20210151952A1
公开(公告)日：2021-05-20
申请号：US17057645
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 , H04B10/50 , H04B10/54 , H04B10/564 , H01S5/026
Abstract: A method (700) of biasing a tunable laser (310) during burst-on and burst-off states includes receiving a burst mode signal (514) indicative of the burst-on state or the burst-off state and when the burst mode signal is indicative of the burst-on state: delivering a first bias current (IGAIN) to an anode of a gain-section diode (590a) disposed on a shared substrate of the tunable laser; and delivering a second bias current (IPH) to an anode of phase-section diode (590b) disposed on the shared substrate. The second bias current is less than the first bias current. When the burst mode signal transitions to be indicative of the burst-off state, the method also includes delivering the first bias current to the anode of the gain-section diode; and delivering the second bias current to the anode of the phase-section diode wherein the first bias current is less than the second bias current.
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公开(公告)号：US20190393958A1
公开(公告)日：2019-12-26
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
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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公开(公告)号：US10153612B1
公开(公告)日：2018-12-11
申请号：US15799118
申请日：2017-10-31
Applicant: Google LLC
Inventor： Tao Zhang , Xiangjun Zhao , Changhong Joy Jiang , Liang Du , Shuang Yin , Cedric Fung Lam , Adam Edwin Taylor Barratt
Abstract: A method includes receiving a mode control signal 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 to an anode of a reflector-section diode and applying an adjustable bias voltage to bias a diode voltage at the anode of the reflector-section diode. The reflector-section diode is disposed on a shared substrate of a tunable laser. When the mode control signal is indicative of the current-mode, the method includes connecting a current-mode bias sub-circuit to the anode of the reflector-section diode and delivering an adjustable bias current to the anode of the reflector-section diode.
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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：US20180323875A1
公开(公告)日：2018-11-08
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
CPC classification number: H04B10/2503 , H04J14/0227 , H04J14/025 , H04J14/0282 , H04J14/0287 , H04J14/0291
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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Patent Agency Ranking
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：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：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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