公开(公告)号：US10084547B2

公开(公告)日：2018-09-25

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: H04B10/00 ,  H04B10/69

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：US12255692B2

公开(公告)日：2025-03-18

申请号：US18196783

申请日：2023-05-12

Applicant: Google LLC

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

IPC: H04B10/60 ,  H04B10/532 ,  H04B10/548 ,  H04B10/40 ,  H04B10/61 ,  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.

公开(公告)号：US20250012664A1

公开(公告)日：2025-01-09

申请号：US18218411

申请日：2023-07-05

Applicant: Google LLC

Inventor： Liming Wang ,  Xiang Zhou ,  Cedric Fung Lam

IPC: G01M11/00

Abstract: Methods and apparatus for monitoring chirp in a modulated light beam. The modulated light is passed through a variable dispersion element or “VDE”, and the light from the variable dispersion element is detected to yield a signal. A parameter which represents the strength of modulation in the light after passage through the VDE such as the peak intensity of the modulated light is measured as the VDE is controlled to vary the applied dispersion. The chip is determined from the variation of the parameter with dispersion, such as from the dispersions at which the parameter is at minima. The method can be applied to beams modulated by common digital transmitters used in optical communication systems.

公开(公告)号：US12107633B2

公开(公告)日：2024-10-01

申请号：US17875025

申请日：2022-07-27

Applicant: Google LLC

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

IPC: H04B10/556 ,  H04B10/50 ,  H04B10/80

CPC classification number: H04B10/5561 ,  H04B10/5053 ,  H04B10/801

Abstract: Systems and methods are disclosed for two-dimensional optical transmission, including systems and methods for modulating and detecting two-dimensional short-reach optical communications. Two-dimensional optical transmissions may be generated by mapping a first data set to a first dimension of an optical signal and mapping a second data set to a second dimension of an optical signal. The encoded data for the first data set may be combined with the encoded data for the second data set so as to produce drive signals for a dual-drive modulator using a combination of both a common-mode and differential signal. The disclosed systems and methods also include dual-mode optical receivers that are configured to operate in either a one-dimensional or two-dimensional mode.

公开(公告)号：US20240137674A1

公开(公告)日：2024-04-25

申请号：US18537005

申请日：2023-12-12

Applicant: Google LLC

Inventor： Jill Berger ,  Kevin Yasumura ,  Xiang Zhou ,  Pedram Z. Dashti ,  Ryohei Urata

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

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：US20240039636A1

公开(公告)日：2024-02-01

申请号：US17875025

申请日：2022-07-27

Applicant: Google LLC

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

IPC: H04B10/556 ,  H04B10/50 ,  H04B10/80

CPC classification number: H04B10/5561 ,  H04B10/5053 ,  H04B10/801

Abstract: Systems and methods are disclosed for two-dimensional optical transmission, including systems and methods for modulating and detecting two-dimensional short-reach optical communications. Two-dimensional optical transmissions may be generated by mapping a first data set to a first dimension of an optical signal and mapping a second data set to a second dimension of an optical signal. The encoded data for the first data set may be combined with the encoded data for the second data set so as to produce drive signals for a dual-drive modulator using a combination of both a common-mode and differential signal. The disclosed systems and methods also include dual-mode optical receivers that are configured to operate in either a one-dimensional or two-dimensional mode.

公开(公告)号：US11671177B2

公开(公告)日：2023-06-06

申请号：US17339400

申请日：2021-06-04

Applicant: Google LLC

Inventor： Liming Wang ,  Xiang Zhou

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

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.

公开(公告)号：US20220166518A1

公开(公告)日：2022-05-26

申请号：US17665988

申请日：2022-02-07

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.

公开(公告)号：US10979148B1

公开(公告)日：2021-04-13

申请号：US16675375

申请日：2019-11-06

Applicant: Google LLC

Inventor： Xiang Zhou ,  Hong Liu

IPC: H04B10/61 ,  H04B10/556 ,  H04B10/54 ,  H04J14/06 ,  H04B10/2507 ,  H04B10/524

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：US20200285524A1

公开(公告)日：2020-09-10

申请号：US16381951

申请日：2019-04-11

Applicant: Google LLC

Inventor： Nishant Patil ,  Xiang Zhou ,  Andrew Swing

IPC: G06F9/50 ,  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.