公开(公告)号：US20230163854A1

公开(公告)日：2023-05-25

申请号：US17848948

申请日：2022-06-24

Applicant: Google LLC

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

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

CPC classification number: H04B10/5051 ,  H04B10/614 ,  G02B6/2773 ,  G02B27/283 ,  G02B6/2935

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.

公开(公告)号：US11626926B2

公开(公告)日：2023-04-11

申请号：US17665988

申请日：2022-02-07

Applicant: Google LLC

Inventor： Xiang Zhou ,  Hong Liu

IPC: H04B10/61 ,  H04B10/556 ,  H04B10/2507 ,  H04B10/524 ,  H04B10/54 ,  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.

公开(公告)号：US11042416B2

公开(公告)日：2021-06-22

申请号：US16381951

申请日：2019-04-11

Applicant: Google LLC

Inventor： Nishant Patil ,  Xiang Zhou ,  Andrew Swing

IPC: G06F9/50 ,  H04L12/751 ,  H04L12/715 ,  H04L12/803 ,  H04L29/08 ,  H04Q11/00

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：US20210135762A1

公开(公告)日：2021-05-06

申请号：US16675375

申请日：2019-11-06

Applicant: Google LLC

Inventor： Xiang Zhou ,  Hong Liu

IPC: H04B10/556 ,  H04B10/54 ,  H04B10/524 ,  H04B10/2507 ,  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.

公开(公告)号：US10812196B2

公开(公告)日：2020-10-20

申请号：US16358200

申请日：2019-03-19

Applicant: Google LLC

Inventor： Xiang Zhou ,  Lieven Verslegers ,  Hong Liu ,  Ryohei Urata

IPC: H04L25/03 ,  H04B10/516

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.

公开(公告)号：US10484230B2

公开(公告)日：2019-11-19

申请号：US15583862

申请日：2017-05-01

Applicant: Google LLC

Inventor： Hong Liu ,  Xiang Zhou

IPC: H04L27/38 ,  H04L5/00 ,  H04B10/079 ,  H04B10/61 ,  H04B10/516 ,  H04L27/00 ,  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：US12218707B2

公开(公告)日：2025-02-04

申请号：US18075938

申请日：2022-12-06

Applicant: Google LLC

Inventor： Xiang Zhou ,  Hong Liu

IPC: H04B10/61 ,  H04B10/2507 ,  H04B10/524 ,  H04B10/54 ,  H04B10/556 ,  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.

公开(公告)号：US12184334B2

公开(公告)日：2024-12-31

申请号：US18138371

申请日：2023-04-24

Applicant: Google LLC

Inventor： Liming Wang ,  Xiang Zhou

IPC: H04B10/50 ,  G02B6/42 ,  H04B10/40 ,  H04B10/572

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.

公开(公告)号：US20230161638A1

公开(公告)日：2023-05-25

申请号：US18075332

申请日：2022-12-05

Applicant: Google LLC

Inventor： Nishant Patil ,  Xiang Zhou ,  Andrew Swing

IPC: G06F9/50 ,  H04L45/02 ,  H04L45/00 ,  H04L47/125 ,  H04Q11/00 ,  H04L67/563

CPC classification number: G06F9/5072 ,  G06F9/5083 ,  H04L45/02 ,  H04L45/46 ,  H04L47/125 ,  H04Q11/0005 ,  H04L67/563 ,  H04Q2011/0058

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：US20230094424A1

公开(公告)日：2023-03-30

申请号：US18075938

申请日：2022-12-06

Applicant: Google LLC

Inventor： Xiang Zhou ,  Hong Liu

IPC: H04B10/556 ,  H04B10/2507 ,  H04B10/524 ,  H04B10/54 ,  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.