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    Pluggable optical module, optical communication system and control method of pluggable optical module
    3.
    发明授权
    Pluggable optical module, optical communication system and control method of pluggable optical module 有权

    公开(公告)号：US11300851B2

    公开(公告)日：2022-04-12

    申请号：US16409227

    申请日：2019-05-10

    申请人： NEC Corporation

    发明人： Katsuhiro Yutani

    IPC分类号： G02F1/225 ,  H04B10/50 ,  H04B10/564 ,  H04B10/588 ,  H04B10/25 ,  H04B10/516 ,  G02F1/21

    摘要： To autonomously apply a bias voltage to an optical modulator according to phase angle information provided from outside in a pluggable optical module. A pluggable electric connector (11) can communicate a communication data signal and a control signal with an optical communication apparatus (92). An optical signal output unit (13) includes a Mach-Zehnder type optical modulator including a phase modulation area and outputs an optical modulation signal (LS) modulated according to the communication data signal. An optical power control unit (14) can control optical power of the optical modulation signal (LS). A pluggable optical receptor (15) can output the optical modulation signal (LS) to an optical fiber (91). A control unit (12) controls a modulation operation of the optical signal output unit (13) and the bias voltage applied to the phase modulation area. The control unit (12) determines the bias voltage applied to the phase modulation area according to phase angle information of the control signal (CON1). The optical signal output unit (13) applies the bias voltage determined by the control unit (12) to the phase modulation area.

    BACKWARD PROPAGATION WITH COMPENSATION OF SOME NONLINEAR EFFECTS OF POLARIZATION MODE DISPERSION
    4.
    发明申请
    BACKWARD PROPAGATION WITH COMPENSATION OF SOME NONLINEAR EFFECTS OF POLARIZATION MODE DISPERSION 有权

    公开(公告)号：US20210126714A1

    公开(公告)日：2021-04-29

    申请号：US17140371

    申请日：2021-01-04

    申请人： NOKIA OF AMERICA CORPORATION

    发明人： Ronen Dar ,  Cristian B. Czegledi

    IPC分类号： H04B10/60 ,  H04B10/61 ,  H04B10/588 ,  H04B10/58 ,  H04B10/2543

    摘要： An optical transport system configured to compensate nonlinear signal distortions using a backward-propagation algorithm in which some effects of polarization mode dispersion on the nonlinear signal distortions are accounted for by employing two or more different approximations of said effects within the bandwidth of the optical communication signal. In an example embodiment, the corresponding digital signal processor (DSP) is configured to switch between different approximations based on a comparison, with a fixed threshold value, of a difference between frequencies of various optical waves contributing to the nonlinear signal distortions, e.g., through four-wave-mixing processes. In different embodiments, the backward-propagation algorithm can be executed by the transmitter's DSP or the receiver's DSP.

    Backward propagation with compensation of some nonlinear effects of polarization mode dispersion
    5.
    发明授权
    Backward propagation with compensation of some nonlinear effects of polarization mode dispersion 有权

    公开(公告)号：US10887022B2

    公开(公告)日：2021-01-05

    申请号：US15624190

    申请日：2017-06-15

    申请人： Alcatel-Lucent USA Inc.

    发明人： Ronen Dar ,  Cristian B. Czegledi

    IPC分类号： H04B10/60 ,  H04B10/61 ,  H04B10/588 ,  H04B10/58 ,  H04B10/2543

    摘要： An optical transport system configured to compensate nonlinear signal distortions using a backward-propagation algorithm in which some effects of polarization mode dispersion on the nonlinear signal distortions are accounted for by employing two or more different approximations of said effects within the bandwidth of the optical communication signal. In an example embodiment, the corresponding digital signal processor (DSP) is configured to switch between different approximations based on a comparison, with a fixed threshold value, of a difference between frequencies of various optical waves contributing to the nonlinear signal distortions, e.g., through four-wave-mixing processes. In different embodiments, the backward-propagation algorithm can be executed by the transmitter's DSP or the receiver's DSP.

    INTEGRATED CONTROL LOOP FOR LINEARIZATION AND TEMPERATURE COMPENSATION OF AN ELECTRO-ABSORPTION MODULATOR
    8.
    发明申请
    INTEGRATED CONTROL LOOP FOR LINEARIZATION AND TEMPERATURE COMPENSATION OF AN ELECTRO-ABSORPTION MODULATOR 审中-公开

    公开(公告)号：US20190238234A1

    公开(公告)日：2019-08-01

    申请号：US16263169

    申请日：2019-01-31

    申请人： ElectroPhotonic-IC Inc.

    发明人： Gudmundur A. HJARTARSON ,  William A. HAGLEY

    IPC分类号： H04B10/50 ,  H04B10/588 ,  G02F1/01

    摘要： An integrated high speed electro-optical control loop for very high-speed linearization and temperature compensation of an electro-absorption modulator (EAM) for analog optical data center interconnect applications is disclosed. The control loop can function in a stable manner because the electronics and optical components are monolithically integrated on a single substrate in small form factor. Because of the small size enabled by monolithic integration, the temperatures of the optical blocks and electronics blocks are tightly coupled, and the control loop time delays and phase delays are small enough to be stable, even for very high frequency operation. This arrangement enables a low cost, low power analog transmitter implementation for data center optical interconnect applications using advanced modulation schemes, such as PAM-4 and DP-QPSK.