公开(公告)号：US11537443B2

公开(公告)日：2022-12-27

申请号：US17332769

申请日：2021-05-27

Applicant: Google LLC

Inventor： Nishant Patil ,  Xiang Zhou ,  Andrew Swing

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

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：US20220278752A1

公开(公告)日：2022-09-01

申请号：US17228122

申请日：2021-04-12

Applicant: Google LLC

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

IPC: H04B10/532 ,  H04B10/548

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：US20220271841A1

公开(公告)日：2022-08-25

申请号：US17339400

申请日：2021-06-04

Applicant: Google LLC

Inventor： Liming Wang ,  Xiang Zhou

IPC: H04B10/50 ,  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：US20210286656A1

公开(公告)日：2021-09-16

申请号：US17332769

申请日：2021-05-27

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：US11082280B2

公开(公告)日：2021-08-03

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 ,  H04B10/548 ,  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：US11075699B2

公开(公告)日：2021-07-27

申请号：US16939555

申请日：2020-07-27

Applicant: Google LLC

Inventor： Xiang Zhou ,  Hong Liu

IPC: H04B10/00 ,  H04B10/516 ,  H04B10/079 ,  H04B10/275 ,  H04B10/60

Abstract: Systems and methods are disclosed herein for coherently modulating and demodulating coherent optical signals using 5-bit constellations. The 5-bit constellations have improved suitability for short reach optical communications systems. A first 5-bit constellation can be formed from four rings. The first and fourth rings can form quadrature phase-shift keyed four-symbol sub-constellations, and the second and third rings can form phase-shift keyed twelve symbol constellations. Symbols from the third and fourth sub-constellations are arranged to form a square. A second 5-bit constellation can include an inner 16 symbol sub-constellation and an sixteen symbol outer sub-constellation. Each of the symbols of the inner sub-constellation are equally spaced from its nearest neighboring symbols along both the quadrature and in-phase axes. Each of the symbols in the outer constellation has an equal euclidean-distance with its nearest neighboring symbols in the outer sub-constellation.

公开(公告)号：US20210211203A1

公开(公告)日：2021-07-08

申请号：US17206854

申请日：2021-03-19

Applicant: Google LLC

Inventor： Xiang Zhou ,  Hong Liu

IPC: H04B10/556 ,  H04J14/06 ,  H04B10/524 ,  H04B10/2507 ,  H04B10/54

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：US10778337B1

公开(公告)日：2020-09-15

申请号：US16415792

申请日：2019-05-17

Applicant: Google LLC

Inventor： Xiang Zhou ,  Hong Liu

IPC: H04B10/00 ,  H04B10/516 ,  H04B10/60 ,  H04B10/275 ,  H04B10/079

Abstract: Systems and methods are disclosed herein for coherently modulating and demodulating coherent optical signals using 5-bit constellations. The 5-bit constellations have improved suitability for short reach optical communications systems. A first 5-bit constellation can be formed from four rings. The first and fourth rings can form quadrature phase-shift keyed four-symbol sub-constellations, and the second and third rings can form phase-shift keyed twelve symbol constellations. Symbols from the third and fourth sub-constellations are arranged to form a square. A second 5-bit constellation can include an inner 16 symbol sub-constellation and an sixteen symbol outer sub-constellation. Each of the symbols of the inner sub-constellation are equally spaced from its nearest neighboring symbols along both the quadrature and in-phase axes. Each of the symbols in the outer constellation has an equal euclidean-distance with its nearest neighboring symbols in the outer sub-constellation.