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公开(公告)号：US11476947B2
公开(公告)日：2022-10-18
申请号：US16421666
申请日：2019-05-24
Applicant: Google LLC
Inventor： Xiang Zhou , Hong Liu
Abstract: A low-power coherent receiver is enabled with enhanced performance for intra-datacenter reach optical interconnection applications using several techniques. The first is a coherent skew adjustment technique which enables lower-power baud-rate ADC sampling and baud-rate-spaced coherent equalization. The second is a real-valued or mixed-valued low-power coherent equalization technique, where a single-tap real-valued 4×4 MIMO equalizer plus four real-valued or two mixed-valued single-input single-out (SISO) equalizers are used for simultaneous polarization recovery, in-phase and quadrature (I/Q) phase error correction, and bandwidth equalization. The third is a power-efficient dual-DSP architecture to enhance coherent receiver performance, in which a complementary low-speed coherent DSP is introduced for optimal I/Q phase error correction and constellation decision parameters determination through more sophisticated algorithms that are too power hungry to be implemented in the primary high-speed DSP.
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公开(公告)号：US20220278766A1
公开(公告)日：2022-09-01
申请号：US17228098
申请日：2021-04-12
Applicant: Google LLC
Inventor： Xiang Zhou , Cedric F. Lam , Ryohei Urata , Hong Liu
Abstract: Coherent optical communications technology for recovery of 1D and 2D formatted optical signals. For example, 1D or 2D formatted signals that travel through fiber optic media may be recovered by separating the light into X- and Y-polarization components, rotating one polarization component (e.g., Y-component) into the polarization space of the other component (e.g., Y-component into the X-polarization space), delaying the rotated component enough to avoid destructive interference and combining the delayed component with the undelayed component to form a folded optical signal, which may then be processed as a X-polarized signal.
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公开(公告)号：US20220150606A1
公开(公告)日：2022-05-12
申请号：US17363532
申请日：2021-06-30
Applicant: Google LLC
Inventor： Jill Berger , Kevin Yasumura , Xiang Zhou , Pedram Z. Dashti , Ryohei Urata
Abstract: An optical links diagnostic system (LDS) and its operation within an optical circuit switch (OCS) for measurement and diagnosis of fiber-optic network fiber performance and quality is disclosed. The LDS can contain two photodetectors, a laser source, and be coupled to an OCS. Optical circulators can further be linked to the OCS. The LDS can be used both as an optical time domain reflectometer (OTDR) or as an optical return loss (ORL) meter and can automate the diagnosis of the fiber optical network fiber insertion loss and return loss.
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公开(公告)号：US20200374011A1
公开(公告)日：2020-11-26
申请号：US16421666
申请日：2019-05-24
Applicant: Google LLC
Inventor： Xiang Zhou , Hong Liu
IPC: H04B10/61
Abstract: A low-power coherent receiver is enabled with enhanced performance for intra-datacenter reach optical interconnection applications using several techniques. The first is a coherent skew adjustment technique which enables lower-power baud-rate ADC sampling and baud-rate-spaced coherent equalization. The second is a real-valued or mixed-valued low-power coherent equalization technique, where a single-tap real-valued 4×4 MIMO equalizer plus four real-valued or two mixed-valued single-input single-out (SISO) equalizers are used for simultaneous polarization recovery, in-phase and quadrature (I/Q) phase error correction, and bandwidth equalization. The third is a power-efficient dual-DSP architecture to enhance coherent receiver performance, in which a complementary low-speed coherent DSP is introduced for optimal I/Q phase error correction and constellation decision parameters determination through more sophisticated algorithms that are too power hungry to be implemented in the primary high-speed DSP.
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公开(公告)号：US20200280372A1
公开(公告)日：2020-09-03
申请号：US16517151
申请日：2019-07-19
Applicant: Google LLC
Inventor： Wenzao Li , Ryohei Urata , Xiang Zhou , Lieven Verslegers
Abstract: A dual-mode optical transceiver is disclosed. The dual-mode optical transceiver includes a receiver section configured to receive both coherently modulated and intensity modulated optical signals and to be optically switched between a first receiver mode for direct detection and a second receiver mode for coherent detection, and a transmitter section including a nested Mach-Zehnder Modulator or a polarization multiplexed quad Mach-Zehnder Modulator configured to be operated in a first transmission mode to output an intensity modulated optical signal and a second transmission mode to output a coherently modulated optical signal. In some implementations, the dual-mode optical receiver includes an optical switch configured to selectively direct a received optical signal down a direct detection optical circuit or a coherent detection optical circuit based on a control signal applied to the optical switch.
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Patent Agency Ranking
公开(公告)号：US12160272B2
公开(公告)日：2024-12-03
申请号：US17848948
申请日：2022-06-24
Applicant: Google LLC
Inventor： Xiang Zhou , Cedric F. Lam , Hong Liu
Abstract: The proposed technology allows for 1+1 optical protection and may improve coherent module output optical power by 3 dB over similar transmitter (Tx) and receiver (Rx) implementation complexity, as well as allow for integration into existing datacenter formats.
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公开(公告)号：US20230261752A1
公开(公告)日：2023-08-17
申请号：US18138371
申请日：2023-04-24
Applicant: Google LLC
Inventor： Liming Wang , Xiang Zhou
IPC: H04B10/50 , H04B10/40 , H04B10/572
CPC classification number: H04B10/506 , H04B10/40 , H04B10/572 , G02B6/4249
Abstract: An optical transceiver may include an optical transmitter and an optical receiver. The optical transmitter and receiver may each include a grid including one or more lanes spaced apart. Each lane may correspond to a predetermined optical signal, or wavelength. The optical transmitter may include one or more sets of lasers to output one or more optical signals corresponding to the grid. Each set of laser may output a set of optical signals. Each set of lasers and, therefore, each set of optical signals may have a different passband. For example, the multiplexing and/or demultiplexing architecture may have a wide passband for the first set of optical signals and a narrow passband for the second set of optical signals. The narrow passband may be determined based on the space between two wider passbands.
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公开(公告)号：US11689292B2
公开(公告)日：2023-06-27
申请号：US17228122
申请日：2021-04-12
Applicant: Google LLC
Inventor： Xiang Zhou , Cedric F. Lam , Ryohei Urata , Hong Liu
IPC: H04B10/60 , H04B10/532 , H04B10/548 , H04B10/61 , H04B10/40 , H04J14/06
CPC classification number: H04B10/532 , H04B10/548 , H04B10/40 , H04B10/60 , H04B10/61 , H04B10/614 , H04J14/06
Abstract: Coherent optical communications technology for recovery of 1D and 2D formatted optical signals. For example, 1D or 2D formatted signals that travel through fiber optic media may be recovered by separating the light into X- and Y-polarization components, rotating one polarization component (e.g., Y-component) into the polarization space of the other component (e.g., Y-component into the X-polarization space), delaying the rotated component enough to avoid destructive interference and combining the delayed component with the undelayed component to form a folded optical signal, which may then be processed as a X-polarized signal.
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公开(公告)号：US11283526B2
公开(公告)日：2022-03-22
申请号：US17206854
申请日：2021-03-19
Applicant: Google LLC
Inventor： Xiang Zhou , Hong Liu
IPC: H04B10/61 , H04B10/54 , H04B10/556 , H04B10/2507 , H04B10/524 , H04J14/06
Abstract: A receiver system is provided for receiving a coherent Pulse Amplitude Modulation (PAM) encoded signal. The receiver system may include an optical polarization component configured to modulate a polarization of the received coherent PAM encoded signal. The receiver system may further include a digital signal processor (DSP) configured to perform polarization recovery between the received coherent PAM encoded signal and the LO signal using a first control loop, and to perform phase recovery between the received coherent PAM encoded signal and the LO signal using a second control loop.
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公开(公告)号：US20200162165A1
公开(公告)日：2020-05-21
申请号：US16358200
申请日：2019-03-19
Applicant: Google LLC
Inventor： Xiang Zhou , Lieven Verslegers , Hong Liu , Ryohei Urata
IPC: H04B10/516 , H04L25/03
Abstract: Systems and methods of transmitting direct detection optical signal are provided. A direct detection optical transmitter according to illustrative embodiments includes a Mach Zehnder Modulator (MZM) configured to modulate laser light based on an electrical drive signal to generate a modulated optical signal and a complementary-modulated optical signal. The optical transmitter includes an optical finite impulse response (FIR) filter configured to receive the complementary-modulated optical signal and generate a filtered optical signal. The optical transmitter includes a polarization rotator configured to receive the filtered optical signal and output a rotated optical signal. The optical transmitter includes an optical combiner configured to combine the modulated optical signal and the rotated optical signal. The optical transmitter includes an output port configured to output the combined optical signal.
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