公开(公告)号：US10341022B2

公开(公告)日：2019-07-02

申请号：US15857477

申请日：2017-12-28

Applicant: ZTE Corporation

Inventor： Junwen Zhang ,  Jianjun Yu

IPC: H04B10/00 ,  H04B10/2525 ,  H04B10/67 ,  H04B10/516 ,  H04B10/2513 ,  H04B10/2543 ,  H04B10/524 ,  H04B10/69

Abstract: At a transmitter-side in an optical communication network, pulse amplitude modulation optical signals to be transmitted are pre-compensated using a chromatic dispersion pre-compensation stage and a device non-linearity pre-compensation stage. The non-linearity pre-compensation may be achieved by using look-up tables that are built based on messages exchanged between the transmitter and a target receiver using known symbol patterns.

公开(公告)号：US09912500B2

公开(公告)日：2018-03-06

申请号：US15034177

申请日：2014-10-31

Applicant: ZTE Corporation

Inventor： Jianjun Yu ,  Hung-Chang Chien ,  Junwen Zhang

IPC: H04B10/06 ,  H04L25/03 ,  H04B10/079 ,  H04B10/61 ,  H04J14/06 ,  H04L7/00

CPC classification number: H04L25/03343 ,  H04B10/0799 ,  H04B10/616 ,  H04J14/06 ,  H04L7/0075

Abstract: The filter estimate produced by post-equalization processing of an optical signal at a receiver is used to generate pre-equalizer filter coefficients that are communicated back to the source of the optical signal for performing pre-equalization. In one advantageous aspect, the already existing post-equalization modules of an optical receive equipment can thus be used to produce, in addition, a pre-equalizer filter for use by the source side.

公开(公告)号：US10587939B2

公开(公告)日：2020-03-10

申请号：US15974396

申请日：2018-05-08

Applicant: ZTE Corporation

Inventor： Jun Shan Wey ,  Junwen Zhang

IPC: H04Q11/00 ,  H04J14/02

Abstract: Techniques for efficiently utilize the available bandwidth in a communication network are described. One example implementation includes a method of optical communication including receiving bandwidth requests from multiple network devices in an optical network, receiving communication capability information about the multiple network devices, generating a transmission schedule that specifies transmissions in the optical network in multiple time slots with a corresponding modulation format, and transmitting and/or receiving data based on the transmission schedule.

公开(公告)号：US20190089463A1

公开(公告)日：2019-03-21

申请号：US16132338

申请日：2018-09-14

Applicant: ZTE Corporation

Inventor： Junwen Zhang ,  Jun Shan Wey ,  Weiliang Zhang ,  Dan Geng

IPC: H04B10/516 ,  H04B10/27 ,  H04L25/02

Abstract: An optical communication method includes performing registration of an optical network unit using optical communication that uses an on-off key based modulation, performing, upon completion of the registration, link estimation, and using a multi-level modulation scheme, whose parameters are based on the link estimation, to perform subsequent communication with the optical network unit.

公开(公告)号：US20190052388A1

公开(公告)日：2019-02-14

申请号：US15676929

申请日：2017-08-14

Applicant: ZTE Corporation

Inventor： Jianjun Yu ,  Jianyang Shi ,  Junwen Zhang ,  Xin Xiao

IPC: H04J14/02 ,  H04B10/2507 ,  H04B10/035 ,  H04B10/077 ,  H04B10/2513 ,  H04B10/2519 ,  H04B10/2525

Abstract: Methods and systems for optical signal transmission, particularly with carrier-less amplitude and phase (CAP) modulation and direct detection, are disclosed. In one exemplary aspect, a method of optical signal transmission is disclosed. The method includes receiving information bits at an input interface; mapping the information bits to a plurality of modulation symbols; separating in-phase (I) and quadrature (Q) components of the plurality of modulation symbols such that the I and Q components form a Hilbert pair in a resulting signal; pre-dispersing the resulting signal with an inverse of a phase delay of an expected chromatic dispersion to obtain a pre-dispersed signal; converting the pre-dispersed signal from digital domain to analog domain using a digital to analog conversion circuit; performing modulation of an output of the digital to analog conversion circuit to generate an output signal; and transmitting, over an optical transmission medium, the output signal from the modulation.

公开(公告)号：US20190020514A1

公开(公告)日：2019-01-17

申请号：US15649433

申请日：2017-07-13

Applicant: ZTE Corporation

Inventor： Junwen Zhang ,  Jianjun Yu ,  Yi Cai ,  Jianyang Shi

IPC: H04L27/04 ,  H04L27/06

Abstract: A digital communication technique, implementable in a digital communication system, includes performing a training phase in which the transmitter sends one or more transmissions of pulse amplitude modulation (PAM) signals wherein the PAM signals are modulated using one or more data-to-PAM-symbol mapping schemes, performing a feedback phase in which the transmitter receives a feedback message from a receiver, the feedback message indicative of a change to be made to data-to-PAM-symbol modulation schemes, and implementing a data transmission phase in which data is transmitted using a current PAM symbol mapping scheme based on the feedback message, wherein at least some symbols of the current PAM symbol modulation scheme are unequally spaced with respect to each other.

公开(公告)号：US09912431B2

公开(公告)日：2018-03-06

申请号：US15043351

申请日：2016-02-12

Applicant: ZTE Corporation

Inventor： Jianjun Yu ,  Fan Li ,  Junwen Zhang ,  Xiao Xin ,  Hung-Chang Chien

IPC: H04J11/00 ,  H04B10/516 ,  H04B10/548 ,  H04L27/26

CPC classification number: H04J11/00 ,  H04B10/5167 ,  H04B10/548 ,  H04L27/2636 ,  H04L27/2649

Abstract: Duo-binary encoding is used for encoding I and Q data prior to performing orthogonal frequency division multiplexing based transmission using discrete Fourier transform spreading (DFT-S). Advantageously, duo-binary encoding improves robustness of the encoded signal to inter symbol interference, making the degradation caused by the subsequent DFT-S stage less susceptible to reduction in bit error rate performance.

公开(公告)号：US09698914B2

公开(公告)日：2017-07-04

申请号：US14781554

申请日：2014-03-28

Applicant: ZTE Corporation

Inventor： Jianjun Yu ,  Junwen Zhang

IPC: H04B10/61 ,  H04L25/03

CPC classification number: H04B10/614 ,  H04B10/612 ,  H04B10/613 ,  H04L25/0305 ,  H04L2025/03636

Abstract: Systems, devices and techniques for processing received QPSK modulated optical signals include sampling the received signal at twice the baud rate, thereby producing samples that are then processed as 9-QAM symbols using a decision directed least squares optimization method. A third stage of channel equalization is filtering performs channel equalization to mitigate linear filtering effects along the transmission link. Data bits are then recovered from the resulting symbol estimates. The received optical signal may also include dual polarized signals for increased bandwidth capacity.

公开(公告)号：US11784741B2

公开(公告)日：2023-10-10

申请号：US17196920

申请日：2021-03-09

Applicant: ZTE Corporation

Inventor： Jun Shan Wey ,  Junwen Zhang

IPC: H04B10/00 ,  H04J14/02 ,  H04L65/1073 ,  H04J14/00

CPC classification number: H04J14/0234 ,  H04J14/0236 ,  H04J14/0242 ,  H04L65/1073

Abstract: A method of communication includes receiving, by an optical line terminal (OLT), a registration request from an optical network unit (ONU) through a specific upstream wavelength, assigning, by the OLT, out of a plurality of normal service upstream wavelengths and a plurality of normal service downstream wavelengths in a wavelength resource pool, a normal service upstream wavelength and a normal service downstream wavelength to the ONU for a normal service between the ONU and the OLT, and informing, through a specific downstream wavelength, the ONU of information regarding the normal service upstream wavelength and the normal service downstream wavelength. The specific downstream and upstream wavelengths are reserved for a registration process that includes receiving, through the specific upstream wavelength, the registration request and sending, through the specific downstream wavelength, the information regarding the normal service upstream wavelength and the normal service downstream wavelength.

公开(公告)号：US11569916B2

公开(公告)日：2023-01-31

申请号：US17271915

申请日：2019-08-27

Applicant: ZTE Corporation

Inventor： Zhijuan Tu ,  Junwen Zhang ,  Xingang Huang ,  Mingsheng Li

IPC: H04B10/40 ,  H04B10/61 ,  H04B10/516 ,  H04B10/572 ,  H04B10/63 ,  H04B10/50 ,  H04B10/2587 ,  H04B10/64

Abstract: Provided is a coherent detection implementing apparatus, system and method. The apparatus includes: a first transceiver unit, configured to send an optical signal in a first direction to a second device, wherein the optical signal in the first direction includes a direct current optical signal with a first wavelength and a modulated optical signal with a second wavelength; and configured to receive an optical signal in a second direction from the second device; and a first coherent receiver, connected with the first transceiver unit, and configured to take a part of the direct current optical signal with the first wavelength in the optical signal in the first direction as a Local Oscillator (LO) light for coherent reception, perform coherent frequency mixing between the LO light and the optical signal in the second direction, and demodulate the optical signal in the second direction.