公开(公告)号：US11984928B1

公开(公告)日：2024-05-14

申请号：US17585309

申请日：2022-01-26

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/2513 ,  H04B10/61

CPC classification number: H04B10/25133 ,  H04B10/6165

Abstract: A method for estimating a chromatic dispersion of an optical-fiber channel is disclosed includes receiving, via the optical-fiber channel, a chromatically-dispersed signal having a symbol rate 1/T. The method also includes, for each chromatic-dispersion value of a plurality of chromatic-dispersion values, determining a respective clock-tone magnitude by: (i) applying, to the chromatically-dispersed signal or a signal derived therefrom, a chromatic dispersion equal to the chromatic-dispersion value to generate a dispersion-compensated signal, and (ii) extracting the clock-tone magnitude from at least one of a positive-frequency clock-tone and a negative-frequency clock-tone of the dispersion-compensated signal, the positive-frequency clock-tone and the negative-frequency clock-tone being spectral components of the dispersion-compensated signal at temporal frequencies 1/T or −1/T respectively. The method also includes determining a maximum of the extracted clock-tone magnitudes. The estimated chromatic dispersion is the chromatic-dispersion value, of the plurality of chromatic-dispersion values, corresponding to the maximum extracted clock-tone magnitude.

公开(公告)号：US11898900B1

公开(公告)日：2024-02-13

申请号：US17652674

申请日：2022-02-25

Applicant: Cable Television Laboratories, Inc.

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

IPC: G01H9/00 ,  G01D5/353

CPC classification number: G01H9/004 ,  G01D5/35358

Abstract: A method for distributed fiber optic sensing (DFOS) includes (a) generating first data signals for transmission via a first fiber optic strand, (b) generating first sensing signals for transmission via the first fiber optic strand, and (c) analyzing at least one of first back-scattering signals and first forward-scattering signals of the first sensing signals, to perform DFOS. The method may further include generating the first sensing signal such that presence of the first sensing signal on the first fiber optic strand does not interfere with transmission of the first data signal by the first fiber optic strand.

公开(公告)号：US11863998B1

公开(公告)日：2024-01-02

申请号：US17461437

申请日：2021-08-30

Applicant: Cable Television Laboratories, Inc.

Inventor： Luis Alberto Campos ,  Bernard McKibben ,  Jennifer Andreoli-Fang ,  Joey Padden ,  Justin Colwell ,  Ian MacMillan

IPC: H04W16/14 ,  H04W24/02 ,  H04W36/08

CPC classification number: H04W16/14 ,  H04W24/02 ,  H04W36/08

Abstract: One wireless telecommunications system includes a Mobile Central Office (MCO) for capacity sharing via a master scheduling system. The MCO is communicatively coupled to a plurality of wireless base stations, each being operable to handle a session from a wireless device and to handoff the session to another wireless base station when the wireless device moves into a range of the other base station. Each of the wireless base stations is operable to convey capacity information to the master scheduling system through the MCO, and to acquire capacity from one or more wireless base stations of another MCO when directed by the master scheduling system.

公开(公告)号：US11863232B2

公开(公告)日：2024-01-02

申请号：US17588875

申请日：2022-01-31

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/2507 ,  H03M3/00

CPC classification number: H04B10/2507 ,  H03M3/458

Abstract: A baseband processing unit includes a baseband processor configured to receive a plurality of component carriers of a radio access technology wireless service, and a delta-sigma digitization interface configured to digitize at least one carrier signal of the plurality of component carriers into a digitized bit stream, for transport over a transport medium, by (i) oversampling the at least one carrier signal, (ii) quantizing the oversampled carrier signal into the digitized bit stream using two or fewer quantization bits.

公开(公告)号：US11777774B2

公开(公告)日：2023-10-03

申请号：US17717571

申请日：2022-04-11

Applicant: Cable Television Laboratories, Inc.

Inventor： Douglas D. Jones ,  Luis Alberto Campos ,  Thomas Holtzman Williams

IPC: H04L27/26 ,  H04Q11/00 ,  H04B10/27 ,  H04L5/00 ,  H04B10/548

CPC classification number: H04L27/2607 ,  H04B10/27 ,  H04B10/548 ,  H04L5/0044 ,  H04L5/0048 ,  H04L27/2697 ,  H04Q11/0067 ,  H04Q2011/0088

Abstract: A method for transmitting a digital frame by an optical network unit in a digital communications network includes steps of arranging received data into a series of symbols, installing a primary cyclic prefix immediately preceding the series of symbols in time, and inserting individual ones of a plurality of secondary cyclic prefixes between each adjacent pair of symbols in the series of symbols. A length of each secondary cyclic prefix corresponds to a first duration shorter than an amount of time needed to turn on a laser of the optical network unit. The method further includes a step of providing to the optical network unit the digital frame. The digital frame includes the primary cyclic prefix, the plurality of secondary cyclic prefixes, and the series of symbols. The method further includes a step of modulating the provided digital frame by a laser of the optical network unit.

公开(公告)号：US11770204B1

公开(公告)日：2023-09-26

申请号：US17682599

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.

公开(公告)号：US11750357B1

公开(公告)日：2023-09-05

申请号：US17225067

申请日：2021-04-07

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/61 ,  H04L7/00

CPC classification number: H04L7/0075 ,  H04B10/61 ,  H04B10/6165

Abstract: Coherent phase recovery method includes producing, with a transmit-side frequency-comb source, a first frequency-comb signal that includes a pilot tone and a first optical tone having a first center wavelength that differs from a pilot center wavelength of the pilot tone. The method also includes coherently modulating the first optical tone to yield a first modulated signal; and generating a second frequency-comb signal with a receive-side frequency-comb source driven by the pilot tone. The method also includes extracting, from the second frequency-comb signal, a first local-oscillator tone having the first center wavelength; and demodulating the first modulated signal by homodyning the first modulated signal with the first local-oscillator tone.

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.

公开(公告)号：US20230209229A1

公开(公告)日：2023-06-29

申请号：US18176236

申请日：2023-02-28

Applicant: Cable Television Laboratories, Inc.

Inventor： Luis Alberto Campos ,  Zhensheng Jia ,  Nicolas Joel Metts ,  Curtis D. Knittle ,  Isaac Elliott ,  Ralph William Brown

IPC: H04Q11/00

CPC classification number: H04Q11/0005 ,  H04Q11/0003 ,  H04Q2011/005 ,  H04Q2011/0043 ,  H04Q2011/0047 ,  H04Q2011/0039

Abstract: A communication network includes a first serving area, a second serving area, a network hub, one or more trunk optical cables, and a first bridging connection. The first serving area includes a first optical switch, a first optical node, and one or more first intra-serving-area (ISA) optical cables communicatively coupling the first optical node to the first optical switch. The second serving area includes a second optical switch, a second optical node, and one or more second ISA optical cables communicatively coupling the second optical node to the second optical switch. The one or more trunk optical cables communicatively couple the first and second optical nodes to the network hub, and the first bridging connection communicatively couples the one or more first ISA optical cables and the one or more second ISA optical cables.

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.