公开(公告)号：US12231170B1

公开(公告)日：2025-02-18

申请号：US18383149

申请日：2023-10-24

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/00 ,  H04B10/112 ,  H04B10/50 ,  H04B10/61

Abstract: A beam steering subsystem is provided in an optical communication system. The beam steering subsystem is configured for steering a free-space optical (FSO) beam from a first transceiver to a second transceiver disposed remotely from the first receiver. The beam steering subsystem includes a beam steering device disposed between the first transceiver and the second transceiver, and an optical tracking unit in optical communication and electrical communication with the beam steering device. The wherein the beam steering device is further configured to (i) receive the FSO beam from the first transceiver, (ii) receive an optical tracking signal from the second transceiver, (iii) optically relay the received optical tracking signal to the optical tracking unit, and (iv) steer the FSO beam to the second transceiver based on an electrical feedback control signal from optical tracking unit.

公开(公告)号：US11996893B2

公开(公告)日：2024-05-28

申请号：US18092372

申请日：2023-01-02

Applicant: Cable Television Laboratories, Inc.

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

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

CPC classification number: H04B10/504 ,  H04B10/502 ,  H04B10/505 ,  H04B10/506 ,  H04B10/532 ,  H04B10/63 ,  H04B10/64 ,  H04J14/04 ,  H04J14/06

Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.

公开(公告)号：US11876556B1

公开(公告)日：2024-01-16

申请号：US17959015

申请日：2022-10-03

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Junwen Zhang ,  Zhensheng Jia ,  Curtis D. Knittle ,  Luis Alberto Campos

IPC: H04B10/079 ,  H04B10/40 ,  H04J14/02

CPC classification number: H04B10/0793 ,  H04B10/40 ,  H04J14/023 ,  H04J14/0223

Abstract: A method for implementing an out-of-band communication channel in a coherent optical access network includes steps (a)-(e). Step (a) includes separating a MAC-layer signal received from a media access control (MAC) layer into an initial communication-channel signal and an initial data-channel signal. Step (b) includes encoding, using a first signal-coding scheme within a transceiver of a coherent passive optical network (PON), the initial communication-channel signal into a communication-channel signal occupying a first frequency band. Step (c) includes encoding, using a second signal-coding scheme within the transceiver, the initial data-channel signal into a data-channel signal occupying a second frequency band not overlapping the first frequency band. Step (d) includes combining the communication-channel signal and the data-channel signal to yield an analog signal. Step (e) includes driving, with the analog signal, an optical modulator to modulate a coherent optical signal for output on a fiber optical path of the coherent PON.

公开(公告)号：US11689286B1

公开(公告)日：2023-06-27

申请号：US17541868

申请日：2021-12-03

Applicant: Cable Television Laboratories, Inc.

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

IPC: H04B10/00 ,  H04B10/2507 ,  H04B10/58

CPC classification number: H04B10/2507 ,  H04B10/58

Abstract: A skew compensation system for a coherent optical communication network includes a transmitter and a receiver in operable communication with an optical transport medium of a coherent optical network. The transmitter includes a first transmitter-side tunable delay line configured to delay transmission of a first signal by a first skew amount, thereby producing a pre-compensated first signal. The receiver includes a first receiver-side tunable delay line configured to delay transmission of the pre-compensated first signal to a digital signal processor (DSP) of the receiver by a second skew amount, thereby producing a final signal that is both pre-compensated and post-compensated (i.e., fully compensated).

公开(公告)号：US20230179306A1

公开(公告)日：2023-06-08

申请号：US18104465

申请日：2023-02-01

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Junwen Zhang ,  Luis Alberto Campos ,  Zhensheng Jia

IPC: H04B10/61

CPC classification number: H04B10/616

Abstract: An optical network communication system utilizes a coherent passive optical network (PON). The system includes an optical line terminal (OLT) having a downstream transmitter and an upstream receiver system configured for time-wavelength division coherent detection. The system further includes a splitter in operable communication with the OLT, and a plurality of optical network units (ONUs) in operable communication with the splitter. Each of the plurality of ONUs is configured to (i) receive downstream coherent burst signals from the OLT, and (ii) transmit at least one upstream burst signal to the OLT. The upstream receiver system further includes a power control module and a local oscillator (LO) configured to generate an optical LO signal The power control module is configured to adaptively control, in real-time, a power level of the optical LO signal.

公开(公告)号：US11539441B1

公开(公告)日：2022-12-27

申请号：US17219563

申请日：2021-03-31

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/516 ,  H04B10/2513

Abstract: A method for laser chirp precompensation includes modulating an amplitude of an optical signal, in response to an amplitude of one of (i) a chirp-compensated signal generated via distortion of an original modulated signal according to an inverse of a chirp-response function of a laser and (ii) a first signal derived from the chirp-compensated signal, to yield an amplitude-modulated optical signal. The method also includes modulating a phase of the amplitude-modulated optical signal in response to a phase of one of (i) the chirp-compensated signal and (ii) a second signal derived from the chirp-compensated signal to yield a chirp-compensated optical signal.

公开(公告)号：US11245970B1

公开(公告)日：2022-02-08

申请号：US17149589

申请日：2021-01-14

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04B10/032 ,  H04Q11/00

Abstract: An optical link redundancy architecture includes an optical switch, an optical coupler, and an optical tap detector. The optical switch including a hub-side switch-port, a normal-mode switch-port, and a failover-mode switch-port. The optical coupler includes (i) a normal-mode coupler-port optically coupled to the normal-mode switch-port via a primary-path optical fiber, and (ii) a failover-mode coupler-port optically coupled to the failover-mode switch-port via a backup-path optical fiber. The optical tap detector (i) is optically coupled to the primary-path optical fiber, (ii) includes a monitor port communicatively coupled to the optical switch, and (iii) outputs a tap signal at the monitor port in response to an optical signal propagating in the primary-path optical fiber. The optical switch optically couples the hub-side switch-port to the failover-mode switch-port when the tap signal is less than a threshold value.

公开(公告)号：US12107668B1

公开(公告)日：2024-10-01

申请号：US18217582

申请日：2023-07-02

Applicant: CABLE TELEVISION LABORATORIES, INC.

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

IPC: H04J14/02

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

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：US12101120B1

公开(公告)日：2024-09-24

申请号：US18092410

申请日：2023-01-02

Applicant: Cable Television Laboratories, Inc.

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

IPC: H04B10/2513 ,  H04B10/50 ,  H04B10/548

CPC classification number: H04B10/25137 ,  H04B10/503 ,  H04B10/548

Abstract: A method for chromatic dispersion pre-compensation in an optical communication network includes (1) distorting an original modulated signal according to an inverse of a transmission function of the optical communication network, to generate a compensated signal, (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：US12074691B1

公开(公告)日：2024-08-27

申请号：US18100253

申请日：2023-01-23

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Mu Xu ,  Ruoyu Sun ,  Balkan Kecicioglu ,  Junwen Zhang ,  Haipeng Zhang ,  Zhensheng Jia ,  Luis Alberto Campos

IPC: H04J14/02 ,  H04B10/11 ,  H04B10/2575 ,  H04Q11/00

CPC classification number: H04J14/023 ,  H04B10/11 ,  H04B10/2575 ,  H04J14/0212 ,  H04Q11/0005 ,  H04Q2011/0015 ,  H04Q2011/0016 ,  H04Q2011/0039

Abstract: A communications network includes a central communication unit, an optical transport medium, and a plurality of remote radio base stations. The central communication unit generates, within a selected millimeter-wave frequency band, a plurality of adjacent two-tone optical frequency conjugate pairs. Each conjugate pair includes a first optical tone carrying a modulated data signal, and a second optical tone carrying a reference local oscillator signal. The optical transport medium transports the plurality of two-tone conjugate pairs to the plurality of radio base stations, and each base station receives at least one conjugate pair at an optical front end thereof. The optical front end separates the first optical tone from the second optical tone, and converts the first optical tone into a millimeter-wave radio frequency electrical signal. The base station further includes a radio antenna system for wirelessly transmitting the millimeter-wave radio frequency electrical signal to at least one wireless receiving device.