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    System and methods for efficient digitization in a communication network
    11.
    发明授权
    System and methods for efficient digitization in a communication network 有权

    公开(公告)号：US11799550B2

    公开(公告)日：2023-10-24

    申请号：US17734338

    申请日：2022-05-02

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： Zhensheng Jia ,  Luis Alberto Campos ,  Curtis Dean Knittle ,  Jing Wang

    IPC: H04B10/2507 ,  H04B10/54 ,  H04B10/69 ,  H03M3/00

    CPC classification number: H04B10/2507 ,  H04B10/541 ,  H04B10/697 ,  H03M3/424 ,  H03M3/43

    Abstract: An analog signal processor includes a sampling unit configured to (i) filter, in the frequency domain, a received time domain analog signal into a low-frequency end of a corresponding frequency spectrum, (ii) sample the filtered analog signal at a frequency substantially higher than the low-frequency end, and (iii) spread quantization noise over an expanded Nyquist zone of the corresponding frequency spectrum. The processor further includes a noise shaping unit configured to shape the spread quantization noise out of the low-frequency end of the corresponding frequency spectrum such that the filtered analog signal and the shaped quantization noise are substantially separated in the frequency domain, and a quantization unit configured to apply delta-sigma modulation to the filtered analog signal using at least one quantization bit, and output a digitized bit stream that substantially follows the amplitude of the received time domain analog signal.

    SYSTEMS AND METHODS FOR INTELLIGENT EDGE TO EDGE OPTICAL SYSTEM AND WAVELENGTH PROVISIONING
    15.
    发明申请
    SYSTEMS AND METHODS FOR INTELLIGENT EDGE TO EDGE OPTICAL SYSTEM AND WAVELENGTH PROVISIONING 有权

    公开(公告)号：US20230017887A1

    公开(公告)日：2023-01-19

    申请号：US17946633

    申请日：2022-09-16

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： Luis Alberto Campos ,  Zhensheng Jia ,  Carmela Stuart

    IPC: H04Q11/00 ,  H04J14/02

    Abstract: An optical access network includes an optical hub having at least one processor. The network further includes a plurality of optical distribution centers connected to the optical hub by a plurality of optical fiber segments, respectively, and a plurality of geographic fiber node serving areas. Each fiber node serving area of the plurality of fiber node serving areas includes at least one optical distribution center of the plurality of optical distribution centers. The network further includes a plurality of endpoints. Each endpoint of the plurality of endpoints is in operable communication with at least one optical distribution center. The network further includes a point-to-point network provisioning system configured to (i) evaluate each potential communication path over the plurality of optical fiber segments between a first endpoint and a second endpoint, and (ii) select an optimum fiber path based on predetermined path selection criteria.

    Systems and methods for skew detection and pre-compensation in a coherent optical system
    18.
    发明授权
    Systems and methods for skew detection and pre-compensation in a coherent optical system 有权

    公开(公告)号：US11539432B1

    公开(公告)日：2022-12-27

    申请号：US17460905

    申请日：2021-08-30

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： Mu Xu ,  Luis Alberto Campos ,  Haipeng Zhang ,  Junwen Zhang ,  Zhensheng Jia

    IPC: H04B10/079 ,  H04B10/54 ,  H04B10/61 ,  H04B10/27

    Abstract: A skew compensation system for a coherent optical communication network includes a transmitter modulator having a first driver input for receiving a first signal from a first channel, a second driver input for receiving a second signal from a second channel, a source input for receiving a continuous wave source signal, and a modulation output in communication with an optical transport medium of the network. The system further includes a tunable delay line disposed between the second channel and the second driver input for inserting a pre-determined training sequence onto the second signal prior to the second driver input, and a processor for determining a skew amount between the second signal at the second driver input and the first signal at the first driver input, calculating a pre-compensation value corresponding to the skew amount, and reducing the skew amount at the modulation output according to the pre-compensation value.

    NETWORK COMMUNICATIONS SYSTEMS AND METHODS
    19.
    发明申请
    NETWORK COMMUNICATIONS SYSTEMS AND METHODS 有权

    公开(公告)号：US20220352986A1

    公开(公告)日：2022-11-03

    申请号：US17867072

    申请日：2022-07-18

    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 narrow band 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 received seed source may enable upstream communications at varying wavelengths. The fiber node may provide each seed source by filtering (e.g., by a grating filter) a broadband light source.

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