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公开(公告)号：US10063944B2
公开(公告)日：2018-08-28
申请号：US15385726
申请日：2016-12-20
Applicant: Google Inc.
Inventor： Liang Du , Yut Loy Chan , Xiangjun Zhao , Changhong Joy Jiang , Cedric Fung Lam , Daoyi Wang , Tao Zhang
IPC: H04Q11/00
CPC classification number: H04Q11/0005 , H04J14/02 , H04J14/0287 , H04J14/08 , H04Q11/0067 , H04Q2011/0035 , H04Q2011/0052 , H04Q2011/0081
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：US10050708B2
公开(公告)日：2018-08-14
申请号：US15385696
申请日：2016-12-20
Applicant: Google Inc.
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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公开(公告)号：US20180175964A1
公开(公告)日：2018-06-21
申请号：US15385798
申请日：2016-12-20
Applicant: Google Inc.
Inventor： Xiangjun Zhao , Daoyi Wang , Liang Du , Changhong Joy Jiang , Cedric Fung Lam
CPC classification number: H04J14/0242 , H04B10/27 , H04B10/572 , H04Q11/0066 , H04Q11/0067 , H04Q2011/0018
Abstract: A system includes a multiplexer having a pass-band and an optical network unit (ONU) optically coupled to the multiplexer. The ONU includes a tunable laser configured to continuously transmit an optical signal to the multiplexer in a burst-on state and a burst-off state. While in the burst-on state, the ONU is configured to tune the tunable laser to transmit the optical signal at a transmit wavelength within the wavelength pass-band of the multiplexer. The multiplexer configured to allow passage therethrough of the optical signal at the transmit wavelength. While in the burst-off state, the ONU is configured to tune the tunable laser to transmit the optical signal at a non-transmit wavelength outside of the wavelength pass-band of the multiplexer. The multiplexer configured to block passage therethrough of the optical signal at the non-transmit wavelength.
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公开(公告)号：US09948422B2
公开(公告)日：2018-04-17
申请号：US15428859
申请日：2017-02-09
Applicant: Google Inc.
Inventor： Xiangjun Zhao , Chiachi Wang , Daoyi Wang , Cedric Fung Lam , Liang Du , Changhong Joy Jiang
CPC classification number: H04J14/0223 , H04B10/296 , H04J14/0205 , H04J14/0221 , H04J14/0282 , H04J14/083
Abstract: A communication system includes a first optical system and a second optical system optically connected to a clamping laser and a pump laser. The first optical system includes first and second optical splitters. The first optical splitter is configured to receive a clamping laser signal from the clamping laser and split the signal into split clamping laser signals. The second optical splitter is configured to receive a pump laser signal from the pump laser and split signal into split pump laser signals. The second optical system is optically connected to the first optical system and includes amplifier systems. Each amplifier system is configured to receive a multiplexed signal. The second optical system includes first and second combiners optically connected to an erbium-doped fiber. The first combiner is optically connected to the first splitter, and the second combiner is optically connected to the second splitter.
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公开(公告)号：US20170332159A1
公开(公告)日：2017-11-16
申请号：US15637939
申请日：2017-06-29
Applicant: Google Inc.
Inventor： Liang Du , Xiangjun Zhao , Cedric Fung Lam , Daoyi Wang , Changhong Joy Jiang
CPC classification number: H04Q11/0067 , H04J14/0241 , H04L69/18 , H04Q11/0005 , H04Q2011/0016 , H04Q2011/0032 , H04Q2011/0079
Abstract: The communication system has first and second optical systems and an optical feed fiber in communication with the first optical system and arranged to convey a feeder optical signal to the second optical system. The first optical system includes a multiplexer configured to multiplex/demultiplex between a first optical line terminal signal, a second optical line terminal signal, and the feeder optical signal. The feeder optical signal includes the first optical line terminal signal and the second optical line terminal signal. The first optical line terminal signal includes a first upstream free spectral range and a first downstream free spectral range. The second optical line terminal signal includes a second upstream free spectral range and a second downstream free spectral range. The second optical system is in communication with the optical feed fiber and is configured to multiplex and demultiplex between the feeder optical signal and optical network unit signals.
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Patent Agency Ranking
公开(公告)号：US09735541B1
公开(公告)日：2017-08-15
申请号：US14293480
申请日：2014-06-02
Applicant: Google Inc.
Inventor： Xiangjun Zhao , Cedric Fung Lam , Steven Fong
CPC classification number: H01S5/143 , H01S3/1003 , H01S3/105 , H01S3/1062 , H01S5/02248 , H01S5/0617 , H01S5/06832 , H01S5/1085
Abstract: A method of calibrating a tunable laser includes shifting a filter output peak defined by a tunable optical feedback filter of the tunable laser in an optical spectral domain to align with a target etalon output peak of a plurality of spaced etalon output peaks defined by an etalon of the tunable laser. The method also includes shifting a cavity frequency grid defined by cavity modes of the tunable laser to align a target cavity mode of the cavity frequency grid with the filter output peak and shifting the spaced output peaks defined by the etalon to align a target etalon output peak with a target wavelength of an output wavelength grid. The method includes modifying a bias current and a modulation current of a gain section of the tunable laser to achieve a defined output modulation amplitude and a defined extinction ratio.
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公开(公告)号：US09729950B2
公开(公告)日：2017-08-08
申请号：US14952321
申请日：2015-11-25
Applicant: Google Inc.
Inventor： Liang Du , Xiangjun Zhao , Cedric Fung Lam , Daoyi Wang , Changhong Joy Jiang
CPC classification number: H04Q11/0067 , H04J14/0241 , H04L69/18 , H04Q11/0005 , H04Q2011/0016 , H04Q2011/0032 , H04Q2011/0079
Abstract: The communication system has first and second optical systems and an optical feed fiber in communication with the first optical system and arranged to convey a feeder optical signal to the second optical system. The first optical system includes a multiplexer configured to multiplex/demultiplex between a first optical line terminal signal, a second optical line terminal signal, and the feeder optical signal. The feeder optical signal includes the first optical line terminal signal and the second optical line terminal signal. The first optical line terminal signal includes a first upstream free spectral range and a first downstream free spectral range. The second optical line terminal signal includes a second upstream free spectral range and a second downstream free spectral range. The second optical system is in communication with the optical feed fiber and is configured to multiplex and demultiplex between the feeder optical signal and optical network unit signals.
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公开(公告)号：US09608758B1
公开(公告)日：2017-03-28
申请号：US14953525
申请日：2015-11-30
Applicant: Google Inc.
Inventor： Xiangjun Zhao , Chiachi Wang , Daoyi Wang , Cedric Fung Lam , Liang Du , Changhong Joy Jiang
CPC classification number: H04J14/0223 , H04B10/296 , H04J14/0205 , H04J14/0221 , H04J14/0282 , H04J14/083
Abstract: A communication system includes a first optical system and a second optical system optically connected to a clamping laser and a pump laser. The first optical system includes first and second optical splitters. The first optical splitter is configured to receive a clamping laser signal from the clamping laser and split the signal into split clamping laser signals. The second optical splitter is configured to receive a pump laser signal from the pump laser and split signal into split pump laser signals. The second optical system is optically connected to the first optical system and includes amplifier systems. Each amplifier system is configured to receive a multiplexed signal. The second optical system includes first and second combiners optically connected to an erbium-doped fiber. The first combiner is optically connected to the first splitter, and the second combiner is optically connected to the second splitter.
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公开(公告)号：US10158930B2
公开(公告)日：2018-12-18
申请号：US15637939
申请日：2017-06-29
Applicant: Google Inc.
Inventor： Liang Du , Xiangjun Zhao , Cedric Fung Lam , Daoyi Wang , Changhong Joy Jiang
Abstract: The communication system has first and second optical systems and an optical feed fiber in communication with the first optical system and arranged to convey a feeder optical signal to the second optical system. The first optical system includes a multiplexer configured to multiplex/demultiplex between a first optical line terminal signal, a second optical line terminal signal, and the feeder optical signal. The feeder optical signal includes the first optical line terminal signal and the second optical line terminal signal. The first optical line terminal signal includes a first upstream free spectral range and a first downstream free spectral range. The second optical line terminal signal includes a second upstream free spectral range and a second downstream free spectral range. The second optical system is in communication with the optical feed fiber and is configured to multiplex and demultiplex between the feeder optical signal and optical network unit signals.
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公开(公告)号：US20180176666A1
公开(公告)日：2018-06-21
申请号：US15385726
申请日：2016-12-20
Applicant: Google Inc.
Inventor： Liang Du , Yut Loy Chan , Xiangjun Zhao , Changhong Joy Jiang , Cedric Fung Lam , Daoyi Wang , Tao Zhang
IPC: H04Q11/00
CPC classification number: H04Q11/0005 , H04J14/02 , H04J14/0287 , H04J14/08 , H04Q11/0067 , H04Q2011/0035 , H04Q2011/0052 , H04Q2011/0081
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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