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    Method and apparatus for evaluating transmitter performance capabilities in a passive optical network
    1.
    发明授权
    Method and apparatus for evaluating transmitter performance capabilities in a passive optical network 有权

    公开(公告)号：US12126948B2

    公开(公告)日：2024-10-22

    申请号：US17746658

    申请日：2022-05-17

    申请人： Nokia Solutions and Networks Oy

    发明人： Doutje Van Veen ,  Amitkumar Mahadevan ,  Vincent Houtsma

    IPC分类号： H04Q11/00 ,  H04B10/073 ,  H04B10/2557

    CPC分类号： H04Q11/0067 ,  H04B10/0731 ,  H04B10/2557 ,  H04Q2011/0083

    摘要： A method and apparatus is proposed for accurately evaluating the performance of optical transmitters under test conditions (such as high bit-rate modulation formats) that compromise the operability of standard test equipment used for this purpose. The proposed apparatus and method are similar to the elements associated with existing testing standards based on an optical eye diagram, with an important distinction that allows for accurate measurements of the transmitter's performance to be made. In particular, the sampling point for collecting eye diagram data samples in the inventive arrangement is shifted by half a period with respect to the conventional mid-eye sampling point, eliminating the need to include representative reference equalizer in the test equipment and providing an evaluation not influenced by the test equipment, resulting in a more accurate measurement of transmitter-related distortions.

    Failure detection device, failure detection method, and failure-detection-program recording medium
    2.
    发明授权
    Failure detection device, failure detection method, and failure-detection-program recording medium 有权

    公开(公告)号：US12107625B2

    公开(公告)日：2024-10-01

    申请号：US17922829

    申请日：2020-05-14

    申请人： NEC Corporation

    发明人： Hiroaki Tanaka

    IPC分类号： H04B10/08 ,  H04B10/073

    CPC分类号： H04B10/073

    摘要： In order to detect a terminal station in which a failure has occurred in a WDM optical transmission system that transmits optical signals transmitted thereto from a plurality of terminal stations after performing wavelength multiplexing of said optical signals, this failure detection device includes: an input unit that receives first optical signals from the plurality of terminal stations, the first optical signals having wavelengths respectively allocated to the plurality of terminal stations on the basis of allocation information, and that joins the received first optical signals; a monitoring unit that outputs monitoring signals, which are signals that are in accordance with the intensities corresponding to the respective wavelengths of the joined first optical signals; and an identifying unit that identifies a first terminal station from the plurality of terminal stations on the basis of the allocation information and the monitoring signals.

    SIGNAL GENERATION APPARATUS AND METHOD
    9.
    发明公开
    SIGNAL GENERATION APPARATUS AND METHOD 审中-公开

    公开(公告)号：US20230370163A1

    公开(公告)日：2023-11-16

    申请号：US18141017

    申请日：2023-04-28

    申请人： FUJITSU LIMITED

    发明人： Jingnan LI ,  Zhenning TAO

    IPC分类号： H04B10/073 ,  H04B10/2543

    CPC分类号： H04B10/073 ,  H04B10/2543

    摘要： A signal generation apparatus and method. The apparatus includes: a memory, and a processor coupled to the memory to control execution of a process to: perform dispersion processing on a two-dimensional reference signal to obtain a two-dimensional dispersion signal; perform at least one time of equiprobability processing, perturbation processing and isospectral processing on a two-dimensional input signal according to the two-dimensional dispersion signal; and output a two-dimensional isospectral equiprobability signal generated, when an equiprobability processed signal or an isospectral processed signal satisfies a predetermined condition, wherein in the equiprobability processing. In the equiprobability processing, the two-dimensional dispersion signal and the two-dimensional input signal are classified, so that numbers of constellation points of the two-dimensional input signal and the two-dimensional dispersion signal of same classes are identical, and the classified two-dimensional input signal and two-dimensional dispersion signal are sorted, so that the equiprobability processed signal maintain joint probability distribution.