公开(公告)号：US20220407602A1

公开(公告)日：2022-12-22

申请号：US17821316

申请日：2022-08-22

Applicant: Cable Television Laboratories, Inc.

Inventor： MU XU ,  ZHENSHENG JIA ,  JUNWEN ZHANG ,  HAIPENG ZHANG ,  LUIS ALBERTO CAMPOS

IPC: H04B10/2507 ,  H04B10/69 ,  H04Q11/00 ,  H04B10/40

Abstract: An echo cancellation method includes steps of (a) extracting phase-distortion estimates, (b) reconstructing an echo signal, (c) generating a clean signal, and (d) producing a primary signal. Step (a) includes extracting, from a first phase signal, a plurality of phase-distortion estimates, the first phase signal having been estimated from an echo-corrupted signal received at a first coherent transceiver of a coherent optical network. Step (b) includes reconstructing an echo signal from the plurality of phase-distortion estimates and a transmitted signal transmitted by the first coherent transceiver. Step (c) includes generating a clean signal as a difference between the reconstructed echo signal and the first phase signal. Step (d) includes producing a primary signal by mapping each of a plurality of clean-phase estimates of the clean signal to one of a plurality of constellation symbols associated with a modulation scheme of the primary signal.

公开(公告)号：US20220337320A1

公开(公告)日：2022-10-20

申请号：US17854564

申请日：2022-06-30

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： HAIPENG ZHANG ,  JUNWEN ZHANG ,  MU XU ,  ZHENSHENG JIA ,  LUIS ALBERTO CAMPOS

IPC: H04B10/50 ,  G02F1/21 ,  G02B27/28 ,  H01S5/32 ,  H04B10/516 ,  H04B10/25 ,  H01S5/323

Abstract: An optical full-field transmitter for an optical communications network includes a primary laser source configured to provide a narrow spectral linewidth for a primary laser signal, and a first intensity modulator in communication with a first amplitude data source. The first intensity modulator is configured to output a first amplitude-modulated optical signal from the laser signal. The transmitter further includes a first phase modulator in communication with a first phase data source and the first amplitude-modulated optical signal. The first phase modulator is configured to output a first two-stage full-field optical signal. The primary laser source has a structure based on a III-V compound semiconductor.

公开(公告)号：US20220312045A1

公开(公告)日：2022-09-29

申请号：US17839060

申请日：2022-06-13

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： ZHENSHENG JIA ,  LUIS ALBERTO CAMPOS ,  MU XU ,  JING WANG

IPC: H04N19/94 ,  H04N19/126 ,  H03M3/00 ,  H04J14/04 ,  H03M1/00 ,  H03M3/04 ,  H03M1/66 ,  H03M1/12 ,  H03M7/30

Abstract: An optical network includes a transmitting portion configured to (i) encode an input digitized sequence of data samples into a quantized sequence of data samples having a first number of digits per sample, (ii) map the quantized sequence of data samples into a compressed sequence of data samples having a second number of digits per sample, the second number being lower than the first number, and (iii) modulate the compressed sequence of data samples and transmit the modulated sequence over a digital optical link. The optical network further includes a receiving portion configured to (i) receive and demodulate the modulated sequence from the digital optical link, (ii) map the demodulated sequence from the second number of digits per sample into a decompressed sequence having the first number of digits per sample, and (iii) decode the decompressed sequence.

公开(公告)号：US20200228207A1

公开(公告)日：2020-07-16

申请号：US16827792

申请日：2020-03-24

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： LUIS ALBERTO CAMPOS

IPC: H04B10/50 ,  H04B10/63 ,  H04B10/532 ,  H04B10/64 ,  H04J14/06 ,  H04J14/04

Abstract: Methods, systems, and devices for network communications to reduce optical beat interference (OBI) in upstream communications are described. For example, a fiber node may provide a seed source to injection lock upstream laser diodes. Therefore, upstream communications from each injection locked laser diode may primarily include the wavelength associated with each seed source. The seed sources may be unique to each end device and configured to minimize OBI. That is, the upstream laser diodes may be generic, but the collected seed source may enable upstream communications at varying wavelengths. The end device may provide upstream communications by externally modulating a signal generated by the injection locked laser diode.

公开(公告)号：US20200213872A1

公开(公告)日：2020-07-02

申请号：US16815285

申请日：2020-03-11

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： LUIS ALBERTO CAMPOS ,  JENNIFER ANDREOLI-FANG ,  THOMAS WILLIAMS

IPC: H04W16/28 ,  H04W64/00

Abstract: Beamforming for adapting wireless signaling beams in an adaptive and agile manner is contemplated. The beamforming may be characterized by adaptively constructing beam form parameters to provide wireless signaling in a manner that maximizes efficiency and bandwidth according to device positioning relative to a responding base station.