公开(公告)号：US10763968B1

公开(公告)日：2020-09-01

申请号：US16517151

申请日：2019-07-19

Applicant: Google LLC

Inventor： Wenzao Li ,  Ryohei Urata ,  Xiang Zhou ,  Lieven Verslegers

IPC: H04B10/00 ,  H04B10/50 ,  H04B10/40 ,  H01S3/10 ,  H01S3/106 ,  H01S5/00 ,  H01S3/105 ,  H04J14/00 ,  G02B6/12

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.

公开(公告)号：US20200036568A1

公开(公告)日：2020-01-30

申请号：US16594640

申请日：2019-10-07

Applicant: Google LLC

Inventor： Hong Liu ,  Xiang Zhou

IPC: H04L27/38 ,  H04L5/00 ,  H04L27/00 ,  H04B10/079 ,  H04B10/61 ,  H04B10/516 ,  H04L1/00 ,  H04L1/20

Abstract: System for adjusting a reference constellation for demodulating an optical signal include a coherent electro-optical receiver configured to convert a received optical signal to a plurality of electrical signals, an array of analog-to-digital convertors configured to digitize the plurality of electrical signals, and processor logic. The processor logic is configured to process the digitized plurality of electrical signals using a reference constellation to yield a plurality of decoded signals and a signal quality measurement. The reference constellation includes an inphase component equal to an ideal inphase component plus an inphase offset and a quadrature component equal to an ideal quadrature component plus a quadrature offset. The processor logic is configured to determine an optimal inphase offset and optimal quadrature offset. The processor logic is configured to update the reference constellation using the optimal inphase offset and the optimal quadrature offset.

公开(公告)号：US20180316541A1

公开(公告)日：2018-11-01

申请号：US15583862

申请日：2017-05-01

Applicant: Google LLC

Inventor： Hong Liu ,  Xiang Zhou

IPC: H04L27/38 ,  H04B10/61 ,  H04B10/516 ,  H04L1/20 ,  H04L1/00

Abstract: System for adjusting a reference constellation for demodulating an optical signal include a coherent electro-optical receiver configured to convert a received optical signal to a plurality of electrical signals, an array of analog-to-digital convertors configured to digitize the plurality of electrical signals, and processor logic. The processor logic is configured to process the digitized plurality of electrical signals using a reference constellation to yield a plurality of decoded signals and a signal quality measurement. The reference constellation includes an inphase component equal to an ideal inphase component plus an inphase offset and a quadrature component equal to an ideal quadrature component plus a quadrature offset. The processor logic is configured to determine an optimal inphase offset and optimal quadrature offset. The processor logic is configured to update the reference constellation using the optimal inphase offset and the optimal quadrature offset.

公开(公告)号：US20180198533A1

公开(公告)日：2018-07-12

申请号：US15914583

申请日：2018-03-07

Applicant: Google LLC

Inventor： Xiang Zhou ,  Ryohei Urata ,  Erji Mao ,  Hong Liu ,  Christopher Lyle Johnson

IPC: H04B10/69

CPC classification number: H04B10/6971 ,  H04B10/697

Abstract: This disclosure provides systems, methods, and apparatus for mitigating the effects of interference signals on optical signals received at a direct-detection optical receivers. The optical receivers are capable of attenuating interference noise signals resulting from the interference between a transmitted optical signal transmitted from a transmitter to the optical receiver and one or more additional signals received at the optical receiver. The interference can be due to multi-path interference or due to in-band interference. The receivers include a tunable filter for filtering the received optical signal to remove the interference. A frequency offset module processes the received optical signal to determine a frequency offset indicative of the difference between the carrier frequencies of a modulated optical signal and an interference optical signal. The offset frequency and a bandwidth determined by the frequency offset module can be used to adjust the tunable filter to remove the interference signal from the received signal.

公开(公告)号：US20250055571A1

公开(公告)日：2025-02-13

申请号：US18931956

申请日：2024-10-30

Applicant: Google LLC

Inventor： Xiang Zhou ,  Cedric F. Lam ,  Hong Liu

IPC: H04B10/50 ,  G02B6/27 ,  G02B6/293 ,  G02B27/28 ,  H04B10/61

Abstract: The disclosed 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.

公开(公告)号：US12182628B2

公开(公告)日：2024-12-31

申请号：US18075332

申请日：2022-12-05

Applicant: Google LLC

Inventor： Nishant Patil ,  Xiang Zhou ,  Andrew Swing

IPC: G06F9/50 ,  H04L45/00 ,  H04L45/02 ,  H04L47/125 ,  H04L67/563 ,  H04Q11/00 ,  H04L47/70 ,  H04L47/72 ,  H04L47/78 ,  H04L47/80 ,  H04L67/1008

Abstract: Methods, systems, and apparatus, including an apparatus for generating clusters of building blocks of compute nodes using an optical network. In one aspect, a method includes receiving request data specifying requested compute nodes for a computing workload. The request data specifies a target n-dimensional arrangement of the compute nodes. A selection is made, from a superpod that includes a set of building blocks that each include an m-dimensional arrangement of compute nodes, a subset of the building blocks that, when combined, match the target n-dimensional arrangement specified by the request data. The set of building blocks are connected to an optical network that includes one or more optical circuit switches. A workload cluster of compute nodes that includes the subset of the building blocks is generated. The generating includes configuring, for each dimension of the workload cluster, respective routing data for the one or more optical circuit switches.

公开(公告)号：US11910134B2

公开(公告)日：2024-02-20

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

IPC: H04B10/071 ,  H04B10/079 ,  H04Q11/00 ,  G02B6/35 ,  G02B26/08 ,  G02B27/30

CPC classification number: H04Q11/0005 ,  G02B6/3518 ,  G02B26/0833 ,  G02B27/30 ,  H04B10/071 ,  H04B10/0795 ,  H04Q2011/003 ,  H04Q2011/0039

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.

公开(公告)号：US20230283380A1

公开(公告)日：2023-09-07

申请号：US18196783

申请日：2023-05-12

Applicant: Google LLC

Inventor： Xiang Zhou ,  Cedric F. Lam ,  Ryohei Urata ,  Hong Liu

IPC: H04B10/532 ,  H04B10/548

CPC classification number: H04B10/532 ,  H04B10/548 ,  H04B10/60

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.

公开(公告)号：US20230224068A1

公开(公告)日：2023-07-13

申请号：US18124707

申请日：2023-03-22

Applicant: Google LLC

Inventor： Xiang Zhou ,  Cedric F. Lam ,  Ryohei Urata ,  Hong Liu

IPC: H04B10/61

CPC classification number: H04B10/6151

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.

公开(公告)号：US11641248B2

公开(公告)日：2023-05-02

申请号：US17228098

申请日：2021-04-12

Applicant: Google LLC

Inventor： Xiang Zhou ,  Cedric F. Lam ,  Ryohei Urata ,  Hong Liu

IPC: H04J14/02 ,  H04J14/06 ,  H04B10/50 ,  H04B10/61 ,  H04B10/60

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.