公开(公告)号：US20240333411A1

公开(公告)日：2024-10-03

申请号：US18127103

申请日：2023-03-28

申请人： Google LLC

发明人： Benoit Lefebvre ,  Zuowei Shen ,  Hong Liu ,  Arjun Singh

IPC分类号： H04J3/06 ,  H04Q11/00

CPC分类号： H04J3/0682 ,  H04Q11/0066 ,  H04Q2011/0079

摘要： The technology is generally directed to programming delays in hardware already existing within fiber networks to reduce the unfairness in transmitting and receiving data. The delays may be programmed in the optics hardware after the deployment of the network. The delays may be determined based on the time it takes the networking switch to replicate data to be transmitted and/or the length of the cables. According to some examples, the delays may be programmed at either or both the egress and ingress optics hardware of a cable. The programmable delay reduces the unfairness of one destination, or end user, receiving data before another destination when the information is intended to be received synchronously.

公开(公告)号：US12107633B2

公开(公告)日：2024-10-01

申请号：US17875025

申请日：2022-07-27

申请人： Google LLC

发明人： Xiang Zhou ,  Cedric F. Lam ,  Hong Liu

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

CPC分类号： H04B10/5561 ,  H04B10/5053 ,  H04B10/801

摘要： 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：US20240039636A1

公开(公告)日：2024-02-01

申请号：US17875025

申请日：2022-07-27

申请人： Google LLC

发明人： Xiang Zhou ,  Cedric F. Lam ,  Hong Liu

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

CPC分类号： H04B10/5561 ,  H04B10/5053 ,  H04B10/801

摘要： 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：US20220166518A1

公开(公告)日：2022-05-26

申请号：US17665988

申请日：2022-02-07

申请人： Google LLC

发明人： Xiang Zhou ,  Hong Liu

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

摘要： 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：US11340468B2

公开(公告)日：2022-05-24

申请号：US16985301

申请日：2020-08-05

申请人： Google LLC

发明人： Ryohei Urata ,  Lieven Verslegers ,  Hong Liu ,  Daoyi Wang

IPC分类号： G02B27/28 ,  G02B27/09 ,  G02B6/126 ,  G02B6/10 ,  G02B6/27 ,  G02F1/09 ,  G02B5/30 ,  G02B6/42

摘要： A photonic integrated circulator can be fabricated by including a plurality of polarizing beam splitters and optical polarization rotators such that two copies of the optical signal are output at a receiver in substantially aligned polarization states. The circulator can be used for facilitating bi-directional communications between photonic integrated circuit devices, which are inherently polarization sensitive, while reducing signal loss.

公开(公告)号：US10979148B1

公开(公告)日：2021-04-13

申请号：US16675375

申请日：2019-11-06

申请人： Google LLC

发明人： Xiang Zhou ,  Hong Liu

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

摘要： 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：US20200036568A1

公开(公告)日：2020-01-30

申请号：US16594640

申请日：2019-10-07

申请人： Google LLC

发明人： Hong Liu ,  Xiang Zhou

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

摘要： 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

申请人： Google LLC

发明人： Hong Liu ,  Xiang Zhou

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

摘要： 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

申请人： Google LLC

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

IPC分类号： H04B10/69

CPC分类号： H04B10/6971 ,  H04B10/697

摘要： 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：US20230163854A1

公开(公告)日：2023-05-25

申请号：US17848948

申请日：2022-06-24

申请人： Google LLC

发明人： Xiang Zhou ,  Cedric F. Lam ,  Hong Liu

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

CPC分类号： H04B10/5051 ,  H04B10/614 ,  G02B6/2773 ,  G02B27/283 ,  G02B6/2935

摘要： 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.