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    COHERENT PHASE-SHIFT-KEYING
    23.
    发明公开
    COHERENT PHASE-SHIFT-KEYING 审中-公开
    相干阶段的控制装置

    公开(公告)号：EP1917770A1

    公开(公告)日：2008-05-07

    申请号：EP06789335.4

    申请日：2006-08-02

    Applicant: Lucent Technologies Inc.

    Inventor： CHEN, Young-kai ,  KOC, Ut-Va ,  LEVEN, Andreas, Bertold

    IPC: H04L27/22

    CPC classification number: H04L27/223 ,  H04B10/60 ,  H04B10/6164 ,  H04B10/6165 ,  H04B10/63 ,  H04L27/227 ,  H04L2027/003

    Abstract: A receiver for coherent detection of a PSK modulated optical carrier includes an optical detector, digital-to-analog converters, and a digital module. The optical detector is configured to mix the modulated optical carrier with two phase components of a reference optical carrier and to produce analog output signals representative of optical signals produced by said mixing. The digital-to-analog converters are connected to receive the analog output signals and to produce digital signals from the received analog output signals. The digital module is connected to receive the digital signals and to perform one of compensating the received digital signals for a conjugate phase misalignment between the mixed components, extracting phase of the received digital signals, and estimating a frequency offset between the two carriers from the received digital signals.

    METHOD AND DEVICE FOR COMPENSATING PHASE DEVIATION
    25.
    发明授权
    METHOD AND DEVICE FOR COMPENSATING PHASE DEVIATION 有权

    公开(公告)号：EP3145112B1

    公开(公告)日：2018-09-05

    申请号：EP14894520.7

    申请日：2014-09-25

    Applicant: ZTE Corporation

    Inventor： WANG, Weiming ,  GENG, Minming

    IPC: H04L7/00 ,  H04L25/02 ,  H04B10/61 ,  H04L27/00

    CPC classification number: H04B10/6165 ,  H04L25/02 ,  H04L27/0014 ,  H04L2027/0067

    Abstract: The present invention provides a method and device for compensating a phase deviation, which are applied to a data sequence between a first training sequence and a second training sequence which are received by a receiving end; The method includes: determining a first phase difference between a first training sequence and a standard training sequence used for reference, and a second phase difference between a second training sequence and the standard training sequence; determining a subdata sequence requiring a phase compensation in multiple subdata sequences forming the data sequence according to the first phase difference and the second phase difference; calculating a phase compensation value corresponding to the subdata sequence requiring the phase compensation by using the first phase difference and the second phase difference; and conducting the phase compensation on the subdata sequence requiring the phase compensation by using the phase compensation value corresponding to the subdata sequence. The solution of the present invention can improve capability of a receiving end to correct a phase deviation in a data sequence.

    Frequency error estimating apparatus and method, frequency error compensating apparatus, and optical receiver
    26.
    发明授权
    Frequency error estimating apparatus and method, frequency error compensating apparatus, and optical receiver 有权

    公开(公告)号：EP2779486B1

    公开(公告)日：2018-08-22

    申请号：EP14154814.9

    申请日：2014-02-12

    Applicant: FUJITSU LIMITED

    Inventor： Nakashima, Hisao

    IPC: H04B10/61

    CPC classification number: H04B10/66 ,  H04B10/6164 ,  H04B10/6165

    Abstract: Provided is a frequency error estimating apparatus used for a coherent optical receiver, which determines an amplitude of a baseband digital electrical signal converted from a received light signal modulated with a phase and amplitude shift keying, determines, with respect to each determined amplitude, a modulated phase component of the baseband digital electrical signal based on phase noise estimation values and frequency error estimation values of N previous symbols (N is a positive integer), and calculates a frequency error based on an inter-symbol phase difference of a signal obtained by cancelling the modulated phase component from the baseband digital electrical signal.

    Transmitter quadrature imbalance compensation at a coherent optical receiver
    28.
    发明授权
    Transmitter quadrature imbalance compensation at a coherent optical receiver 有权

    公开(公告)号：EP2930865B1

    公开(公告)日：2018-06-06

    申请号：EP14305505.1

    申请日：2014-04-07

    Applicant: Alcatel Lucent

    Inventor： Gavioli, Giancarlo ,  Razzetti, Luca ,  Pepe, Marianna ,  Costantini, Carlo

    IPC: H04B10/61

    CPC classification number: H04B10/6165

    Abstract: It is disclosed a an apparatus for compensating transmitter quadrature imbalances over an optical signal received at an optical coherent receiver of a node of an optical communication network. The optical signal comprises information symbols and pilot symbols. The receiver is configured to store a sequence of reference pilot symbols. The apparatus comprises an absolute phase estimating circuit configured to estimate a phase error between a received pilot symbol and a corresponding reference pilot symbol; a phase correcting module configured to remove the phase error from the received pilot symbol and a number of received information symbols associated with the received pilot symbol; a quadrature imbalance detection circuit configured to estimate the transmitter quadrature imbalances on the basis of at least the phase-corrected pilot symbol; and a quadrature imbalance compensation circuit configured to compensate the estimated transmission quadrature imbalances over the number of phase-corrected information symbols.

    SAMPLING PHASE SELECTION IN AN OPTICAL RECEIVER
    30.
    发明公开
    SAMPLING PHASE SELECTION IN AN OPTICAL RECEIVER 审中-公开
    在光接收机中采样相位选择

    公开(公告)号：EP3248307A1

    公开(公告)日：2017-11-29

    申请号：EP15704538.6

    申请日：2015-02-13

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： STOJANOVIC, Nebojsa

    IPC: H04B10/61 ,  H04L1/20 ,  H04L27/26

    CPC classification number: H04B10/6165 ,  H04L1/20 ,  H04L27/2647

    Abstract: Disclosed is a method of selecting a sampling phase in an optical receiver, the method includes estimating a plurality of sampling phase quality indicator (SPQI) values for a plurality of adjusted sampling phases within or more unit intervals in a received signal. The method additionally includes selecting from the plurality of SPQI values the SPQI with the highest value. Also disclosed is an equalization circuit including an equalizer to equalize a received signal, and a best sampling phase estimator (BSPE) 30 to estimate a plurality of sampling phase quality indicator (SPQI) values for a plurality of adjusted sampling phases within one or more unit intervals in said received signal. The BSPE 30 additionally selects from the plurality of SPQI values the SPQI with the highest value.

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