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    System and methods for time and frequency division passive optical network
    91.
    发明授权
    System and methods for time and frequency division passive optical network 有权

    公开(公告)号：US11695493B1

    公开(公告)日：2023-07-04

    申请号：US17682993

    申请日：2022-02-28

    Applicant: CABLE TELEVISION LABORATORIES, INC.

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

    IPC: H04J14/00 ,  H04J14/02

    CPC classification number: H04J14/0282 ,  H04J14/025 ,  H04J14/0246 ,  H04J14/0247

    Abstract: A coherent passive optical network includes a downstream transceiver and first and second upstream transceivers in communication with an optical transport medium. The downstream transceiver includes a downstream processor for mapping a downstream data stream to a plurality of sub-bands, and a downstream transmitter for transmitting a downstream optical signal modulated with the plurality of sub-bands. The first upstream transceiver includes a first local oscillator (LO) for tuning a first LO center frequency to a first sub-band of the plurality of sub-bands, and a first downstream receiver for coherently detecting the downstream optical signal within the first sub-band. The second upstream transceiver includes a second downstream receiver configured for coherently detecting the downstream optical signal within a second sub-band of the plurality of sub-bands. The downstream processor dynamically allocates the first and second sub-bands to the first and second transceivers in the time and frequency domains.

    Encrypted data transmission in optical- and radio-access networks based on quantum key distribution
    93.
    发明授权
    Encrypted data transmission in optical- and radio-access networks based on quantum key distribution 有权

    公开(公告)号：US11616645B1

    公开(公告)日：2023-03-28

    申请号：US17671090

    申请日：2022-02-14

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： Jing Wang ,  Bernardo Huberman ,  Luis Alberto Campos ,  Zhensheng Jia

    IPC: H04L29/06 ,  H04L9/08 ,  H04L9/14 ,  H04B10/27

    Abstract: A first node of a network includes a quantum transmitter, a classical transceiver, and an initial-key generator that cooperate with a second node to transmit an initial key via the quantum transmitter. The first node includes a key-series generator that (i) encrypts a first unencrypted key of a series of unencrypted keys to generate a first encrypted key of a series of encrypted keys and (ii) encrypts each subsequent unencrypted key of the series of unencrypted keys with a preceding unencrypted key of the series of unencrypted keys to generate a subsequent encrypted key of the series of encrypted keys. The encrypted keys are transmitted to the second node. The first node includes one or both of a decryptor and an encryptor. The decryptor decrypts encrypted data using a last unencrypted key of the series of unencrypted keys. The encryptor encrypts unencrypted data using the last unencrypted key.

    SYSTEM AND METHODS FOR DISTRIBUTION OF HETEROGENEOUS WAVELENGTH MULTIPLEXED SIGNALS OVER OPTICAL ACCESS NETWORK
    95.
    发明申请
    SYSTEM AND METHODS FOR DISTRIBUTION OF HETEROGENEOUS WAVELENGTH MULTIPLEXED SIGNALS OVER OPTICAL ACCESS NETWORK 有权

    公开(公告)号：US20220385369A1

    公开(公告)日：2022-12-01

    申请号：US17884457

    申请日：2022-08-09

    Applicant: Cable Television Laboratories, Inc.

    Inventor： Luis Alberto Campos ,  Zhensheng Jia

    IPC: H04B10/2575 ,  H04J14/02 ,  H04Q11/00 ,  H04B10/272

    Abstract: An optical network communication system includes an optical hub, an optical distribution center, at least one fiber segment, and at least two end users. The optical hub includes an intelligent configuration unit configured to monitor and multiplex at least two different optical signals into a single multiplexed heterogeneous signal. The optical distribution center is configured to individually separate the at least two different optical signals from the multiplexed heterogeneous signal. The at least one fiber segment connects the optical hub and the optical distribution center, and is configured to receive the multiplexed heterogeneous signal from the optical hub and distribute the multiplexed heterogeneous signal to the optical distribution center. The at least two end users each include a downstream receiver configured to receive one of the respective separated optical signals from the optical distribution center.

    Systems and methods for intelligent edge to edge optical system and wavelength provisioning
    96.
    发明授权
    Systems and methods for intelligent edge to edge optical system and wavelength provisioning 有权

    公开(公告)号：US11451888B2

    公开(公告)日：2022-09-20

    申请号：US17140042

    申请日：2021-01-02

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： Luis Alberto Campos ,  Zhensheng Jia ,  Carmela Stuart

    IPC: H04B10/00 ,  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.

    Echo cancellation system and method
    97.
    发明授权
    Echo cancellation system and method 有权

    公开(公告)号：US11424828B1

    公开(公告)日：2022-08-23

    申请号：US17207982

    申请日：2021-03-22

    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.

    System and methods for coherent optics based daisy-chaining
    98.
    发明授权
    System and methods for coherent optics based daisy-chaining 有权

    公开(公告)号：US11411649B2

    公开(公告)日：2022-08-09

    申请号：US16760098

    申请日：2018-11-05

    Applicant: CABLE TELEVISION LABORATORIES, INC.

    Inventor： Luis Alberto Campos ,  Zhensheng Jia ,  Jing Wang

    IPC: H04B10/2575 ,  H04B10/532 ,  H04B10/61 ,  H04J14/02

    Abstract: An optical access network includes an optical hub having at least one processor, and a plurality of optical fiber strands. Each optical fiber strand has a first strand end connected to the optical hub. The network further includes a plurality of nodes connected to at least one segment of a first fiber strand of the plurality of optical fiber strands. Each node is sequentially disposed at respective locations along the first fiber strand at different differences from the optical hub, respectively. The network further includes a plurality of end-points. Each end-point includes a receiver. Each respective receiver (i) has a different optical signal-to-noise ratio (OSNR) from the other receivers, (ii) is operably coupled with at least one node of the plurality of nodes, and (iii) is configured to receive the same optical wavelength signal from the first fiber strand as received by the other receivers.

    Systems and methods for carrier phase recovery
    99.
    发明授权
    Systems and methods for carrier phase recovery 有权

    公开(公告)号：US11387929B1

    公开(公告)日：2022-07-12

    申请号：US17077906

    申请日：2020-10-22

    Applicant: CABLE TELEVISION LABORATORIES, INC

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

    IPC: H04J14/06 ,  H04B10/61 ,  H04B10/67

    Abstract: A digital receiver is configured to process a polarization multiplexed carrier from a communication network. The polarization multiplexed carrier includes a first polarization and a second polarization. The receiver includes a first lane for transporting a first input signal of the first polarization, a second lane for transporting a second input signal of the second polarization, a dynamic phase noise estimation unit disposed within the first lane and configured to determine a phase noise estimate of the first input signal, a first carrier phase recovery portion configured to remove carrier phase noise from the first polarization based on a combination of the first input signal and a function of the determined phase noise estimate, and a second carrier phase recovery portion configured to remove carrier phase noise from the second polarization based on a combination of the second input signal and the function of the determined phase noise estimate.

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