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公开(公告)号：US20170317778A1
公开(公告)日：2017-11-02
申请号：US15655307
申请日：2017-07-20
Applicant: Google Inc.
Inventor： Cedric Fung Lam , Liang Du , Changhong Joy Jiang , Ben Warren Segura , Xiangjun Zhao , Daoyi Wang
CPC classification number: H04J14/0247 , H04B10/2503 , H04J14/0221 , H04J14/0223 , H04J14/0242 , H04J14/0265 , H04J14/0282 , H04J14/08 , H04Q11/0067
Abstract: A communication system includes a first multiplexer configured to multiplex a first optical line terminal signal having a first multiplexing group and a second optical line terminal signal having a second multiplexing group into a first multiplexed signal. The communication system includes a second multiplexer configured to demultiplex a second multiplexed signal into a third optical line terminal signal having the first multiplexing group and a fourth optical line terminal signal having the second multiplexing group. Moreover, the communication system includes a third multiplexer optically connected with the first multiplexer and the second multiplexer, the third multiplexer configured to multiplex/demultiplex between a feeder optical signal and the first and second multiplexed signals. The first and second optical line terminal signals include a legacy upstream free spectral range, and the third and fourth optical line terminal signals include a legacy downstream free spectral range.
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公开(公告)号：US20170134113A1
公开(公告)日：2017-05-11
申请号：US14938146
申请日：2015-11-11
Applicant: Google Inc.
Inventor： Cedric Fung Lam , Liang Du , Changhong Joy Jiang , Ben Warren Segura , Xiangjun Zhao , Daoyi Wang
IPC: H04J14/02
CPC classification number: H04J14/0247 , H04B10/2503 , H04J14/0221 , H04J14/0223 , H04J14/0242 , H04J14/0265 , H04J14/0282 , H04J14/08 , H04Q11/0067
Abstract: A communication system includes a first multiplexer configured to multiplex a first optical line terminal signal having a first multiplexing group and a second optical line terminal signal having a second multiplexing group into a first multiplexed signal. The communication system includes a second multiplexer configured to demultiplex a second multiplexed signal into a third optical line terminal signal having the first multiplexing group and a fourth optical line terminal signal having the second multiplexing group. Moreover, the communication system includes a third multiplexer optically connected with the first multiplexer and the second multiplexer, the third multiplexer configured to multiplex/demultiplex between a feeder optical signal and the first and second multiplexed signals. The first and second optical line terminal signals include a legacy upstream free spectral range, and the third and fourth optical line terminal signals include a legacy downstream free spectral range.
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公开(公告)号：US09438005B1
公开(公告)日：2016-09-06
申请号：US14293604
申请日：2014-06-02
Applicant: Google Inc.
Inventor： Xiangjun Zhao , Cedric Fung Lam , Steven Fong
IPC: H01S3/10 , H01S3/139 , H01S5/0625 , H01S5/125
CPC classification number: H01S5/06256 , H01S5/0014 , H01S5/02415 , H01S5/0617 , H01S5/0625 , H01S5/06255 , H01S5/06804 , H01S5/125
Abstract: A method of calibrating a tunable laser having a distributed Bragg reflector includes, aligning a reflection peak of the distributed Bragg reflector with a target cavity mode of a plurality of cavity modes defined by a total optical path length inside a resonant cavity of the tunable laser. The method includes aligning a resultant lasing mode with a target wavelength of an output wavelength grid. The resultant lasing mode is formed by alignment of the reflection peak of the distributed Bragg reflector with the target cavity mode. The method also includes setting a target output power and a target extinction ratio of the tunable laser.
Abstract translation: 校准具有分布式布拉格反射器的可调谐激光器的方法包括：将分布布拉格反射器的反射峰与由可调谐激光器的谐振腔内部的总光路长度限定的多个空腔模式的目标腔模式对准。 该方法包括将所得的激光模式与输出波长网格的目标波长对准。 所得到的激光模式是通过将分布式布拉格反射器的反射峰与目标空腔模式对准而形成的。 该方法还包括设置可调激光器的目标输出功率和目标消光比。
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公开(公告)号：US09240672B1
公开(公告)日：2016-01-19
申请号：US14293133
申请日：2014-06-02
Applicant: Google Inc.
Inventor： Xiangjun Zhao , Cedric Fung Lam , Steven Fong
CPC classification number: H01S5/0612 , H01S5/02415 , H01S5/06256 , H01S5/125
Abstract: A wavelength tunable laser includes a gain section, a grating section, and an isolation section. The gain section generates and modulates an optical signal. The grating section is positioned adjacent to the gain section, and the isolation section is disposed between the gain section and the grating section. The isolation section impedes conduction of an electrical current between the gain section and the grating section.
Abstract translation: 波长可调激光器包括增益部分，光栅部分和隔离部分。 增益部分生成并调制光信号。 光栅部分位于增益部分附近，并且隔离部分设置在增益部分和光栅部分之间。 隔离部分阻止增益部分和光栅部分之间的电流传导。
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公开(公告)号：US09001852B1
公开(公告)日：2015-04-07
申请号：US14023104
申请日：2013-09-10
Applicant: Google Inc.
Inventor： Ryohei Urata , Pedram Zare Dashti , Cedric Fung Lam , Xiangjun Zhao , Hong Liu
CPC classification number: H01S5/02415 , H01S5/026 , H01S5/0265 , H01S5/0612 , H01S5/12 , H01S5/4031 , H01S5/4087
Abstract: The wavelength tunable laser includes a thermo-electric cooler (TEC), a distributed feedback portion, and a semiconductor optical amplifier (SOA). The distributed feedback portion is disposed on the thermo-electric cooler and has a plurality of distributed feedback (DFB) lasers connected in series. Each DFB laser is configured to output an optical signal within a different temperature dependent tunable range of wavelengths. Therefore, the distributed feedback portion outputs an optical signal from one of the DFB lasers. The SOA is optically connected to the distributed feedback portion. The SOA amplifies and modulates the optical signal outputted from the distributed feedback portion.
Abstract translation: 波长可调激光器包括热电冷却器（TEC），分布式反馈部分和半导体光放大器（SOA）。 分布式反馈部分设置在热电冷却器上并且具有串联连接的多个分布式反馈（DFB）激光器。 每个DFB激光器被配置为在不同的温度依赖的可调谐波长范围内输出光信号。 因此，分布式反馈部分输出来自DFB激光器之一的光信号。 SOA与分布式反馈部分光学连接。 SOA放大并调制从分布式反馈部分输出的光信号。
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Patent Agency Ranking
公开(公告)号：US10243687B2
公开(公告)日：2019-03-26
申请号：US15354811
申请日：2016-11-17
Applicant: Google Inc.
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：US10103513B1
公开(公告)日：2018-10-16
申请号：US15631594
申请日：2017-06-23
Applicant: Google Inc.
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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公开(公告)号：US20180139006A1
公开(公告)日：2018-05-17
申请号：US15354811
申请日：2016-11-17
Applicant: Google Inc.
Inventor： Xiangjun Zhao , Cedric Fung Lam , Shuang Yin , Changhong Joy Jiang , Ke Dong
CPC classification number: H04J14/0295 , H04J14/0246 , H04J14/0249 , H04J2014/0253 , H04Q11/0067 , H04Q2011/0081 , H04Q2011/0083
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：US20170155461A1
公开(公告)日：2017-06-01
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：US10171199B2
公开(公告)日：2019-01-01
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
IPC: H04B10/27 , H04J14/02 , H04Q11/00 , H04B10/572 , H01S5/0625
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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