公开(公告)号：US12063107B1

公开(公告)日：2024-08-13

申请号：US17949974

申请日：2022-09-21

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04J4/00 ,  H04L5/26

CPC classification number: H04J4/005 ,  H04L5/26

Abstract: A method for extracting a plurality of data streams from a time-frequency division multiplexed (TFDM) signal includes determining a plurality of sub-channels of the TFDM signal, where each of the plurality of sub-channels has a respective one of a plurality of frequency ranges. The method also includes down-converting, based on the plurality of frequency ranges, the TFDM signal into a plurality of down-converted signals, where each down-converted signal corresponds to a respective one of the plurality of sub-channels. The method also includes extracting the plurality of data streams from a respective one of the plurality of down-converted signals.

公开(公告)号：US11990937B2

公开(公告)日：2024-05-21

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 ,  H04B10/40 ,  H04B10/69 ,  H04Q11/00

CPC classification number: H04B10/2572 ,  H04B10/40 ,  H04B10/6971 ,  H04Q11/0067 ,  H04Q2213/1319

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：US11889369B1

公开(公告)日：2024-01-30

申请号：US17525368

申请日：2021-11-12

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Omkar Shripad Dharmadhikari ,  Mu Xu ,  Bernardo Huberman

IPC: H04W4/00 ,  H04W36/00 ,  H04W36/14 ,  H04W36/08

CPC classification number: H04W36/0085 ,  H04W36/08 ,  H04W36/14

Abstract: A method is provided for initiating a handover of a wireless device from a first node to a second node in a communication network. The method includes steps of (a) obtaining, at a first time, a (i) speed, (ii) direction, and (iii) first location of the wireless device, (b) determining, relative to the first location, a first signal strength of the second node and a second, higher signal strength of a third node different from the second node, (c) estimating, based on the obtained (i) first location, (ii) speed, and (iii) direction, a second location for the wireless device at a second, subsequent time, (d) confirming that the second location is within a transmission range of the second node, and (e) preempting the handover to the third node by performing, prior to the second time, the handover directly from the first node to the second node.

公开(公告)号：US11888525B2

公开(公告)日：2024-01-30

申请号：US17170403

申请日：2021-02-08

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/40 ,  H04B10/61 ,  H04B10/50 ,  H04L5/14 ,  H04B10/25

CPC classification number: H04B10/40 ,  H04B10/25891 ,  H04B10/50 ,  H04B10/61 ,  H04L5/14

Abstract: A full duplex communication network includes an optical transmitter end having a first coherent optics transceiver, an optical receiver end having a second coherent optics transceiver, and an optical transport medium operably coupling the first coherent optics transceiver to the second coherent optics transceiver. The first coherent optics transceiver is configured to simultaneously transmit a downstream optical signal and receive an upstream optical signal. The second coherent optics transceiver is configured to simultaneously receive the downstream optical signal from the first coherent optics transceiver and transmit the upstream optical signal first coherent optics transceiver. At least one of the downstream optical signal and the upstream optical signal includes at least one coherent optical carrier and at least one non-coherent optical carrier.

公开(公告)号：US11855694B1

公开(公告)日：2023-12-26

申请号：US17526341

申请日：2021-11-15

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/00 ,  H04B10/50 ,  H04B10/40 ,  H04B10/548 ,  H04B10/27

CPC classification number: H04B10/503 ,  H04B10/27 ,  H04B10/40 ,  H04B10/548

Abstract: An optical communication network includes a primary laser source, a first comb generator, and a first transceiver. The first comb generate a first plurality of comb tones having constant frequency spacing. The first transceiver includes a first transmitter having a secondary laser with a resonator frequency injection locked to a frequency of a single longitudinal mode corresponding to a particular comb tone of the first plurality of comb tones. The first transmitter adheres input data onto the injection locked frequency, and outputs a modulated data stream over an optical transport to a second transceiver downstream of the first transceiver. The improvement includes a second comb generator disposed downstream of, receives a seed tone from, and is phase-synchronized with, the first comb generator. The second comb generator outputs a second plurality of comb tones substantially conforming to the frequencies and frequency spacing of the first plurality of comb tones.

公开(公告)号：US11804905B1

公开(公告)日：2023-10-31

申请号：US17688487

申请日：2022-03-07

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/50 ,  H04B10/516

CPC classification number: H04B10/505 ,  H04B10/504 ,  H04B10/506 ,  H04B10/5161

Abstract: An optical full-field transmitter (OFFT) includes a plurality of optical circulators and a polarization beam combiner. The plurality of optical circulators are fabricated on a silicon-on-insulator (SOI) substrate, where each of the optical circulators has (a) a first port that optically couples to a high-quality optical source, (b) a second port that optically couples to a child laser configured to receive amplitude modulation data, and (c) a third port optically coupled to a phase modulator that (i) is configured to receive a phase modulation data and (ii) includes an output port that outputs amplitude and phase modulated light. The polarization beam combiner receives the amplitude and phase modulated light from each of the optical circulators and outputs combined amplitude and phase modulated light.

公开(公告)号：US11784719B1

公开(公告)日：2023-10-10

申请号：US17220616

申请日：2021-04-01

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/50 ,  H04B10/564 ,  H04B10/556 ,  H04B10/27 ,  H04B10/079 ,  H04J14/02

CPC classification number: H04B10/5563 ,  H04B10/07955 ,  H04B10/27 ,  H04B10/501 ,  H04B10/506 ,  H04B10/564 ,  H04J14/0221

Abstract: A method for tuning a power characteristic of an optical frequency comb includes controlling a modulating light source according to a plurality of modulation parameters to generate an optical frequency comb including a plurality of optical tones. Additionally, at least one of the plurality of modulation parameters is changed until a total power of the plurality of optical tones is greater than or equal to a minimum threshold value. Furthermore, at least one of the plurality of modulation parameters are changed until respective powers of each of the plurality of optical tones are within a predetermined proximity to respective target powers of each of the plurality of optical tones.

公开(公告)号：US11736199B1

公开(公告)日：2023-08-22

申请号：US17339740

申请日：2021-06-04

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/50 ,  H04B10/61 ,  H04B10/63

CPC classification number: H04B10/504 ,  H04B10/50572 ,  H04B10/6164 ,  H04B10/6165 ,  H04B10/63

Abstract: A method for phase compensation in an optical communication network includes (1) modifying a modulated signal according to one or more correction factors to generate a compensated signal, to compensate for phase rotation, (2) modulating a magnitude of an optical signal in response to a magnitude of the compensated signal, and (3) modulating a phase of the optical signal, after modulating the magnitude of the optical signal, in response to a phase of the compensated signal.

公开(公告)号：US11705694B1

公开(公告)日：2023-07-18

申请号：US17187237

申请日：2021-02-26

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H01S3/16 ,  H01S5/40 ,  H01S5/14 ,  H01S5/065 ,  H01S5/00 ,  H01S5/028 ,  H04B10/50

CPC classification number: H01S5/4006 ,  H01S5/005 ,  H01S5/0288 ,  H01S5/0656 ,  H01S5/14 ,  H01S5/141 ,  H04B10/503

Abstract: An injection locking laser source is provided for an optical communications system. The injection locking laser source includes a laser cavity configured to receive an externally injected low linewidth primary light source. The laser cavity includes a cavity length, a cavity facet reflectivity, and a cavity quality factor. The injection locking laser source further includes an emitting region configured to output a secondary light source injection locked to the externally injected low linewidth primary light source at a stable detuning frequency based on a photon number, a steady-state phase, and a carrier number of the primary light source injected into the cavity.

公开(公告)号：US11683102B1

公开(公告)日：2023-06-20

申请号：US17503278

申请日：2021-10-16

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Haipeng Zhang ,  Junwen Zhang ,  Jingjie Zhu ,  Mu Xu ,  Zhensheng Jia

IPC: H04B10/69 ,  H04B10/516

CPC classification number: H04B10/6932 ,  H04B10/5161

Abstract: A method for allocating bandwidth to a first ONU, a second ONU, M1 ONUs, and M2 ONUs includes, during an allocation cycle, (i) granting a respective upstream time slot to, of a plurality of N ONUs, only each of the M1 ONUs, and (ii) granting a first upstream time slot to the first ONU. Each of the M1 ONUs and M2 ONUs is one of the plurality of N ONUs. The method also includes, during a subsequent cycle, (i) granting a respective upstream time slot to, of the plurality of N ONUs, only each of the M2 ONUs. The N ONUs includes a skipped-ONU that is one of either, and not both, the M1 ONUs and the M2 ONUs. The method includes, during the subsequent allocation cycle, granting a second upstream time slot to a second ONU, which is not one of the plurality of N ONUs.