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    Error correction in optical networks with probabilistic shaping and symbol rate optimization
    1.
    发明授权
    Error correction in optical networks with probabilistic shaping and symbol rate optimization 有权

    公开(公告)号：US11012187B1

    公开(公告)日：2021-05-18

    申请号：US16809221

    申请日：2020-03-04

    申请人： Fujitsu Limited

    发明人： Inwoong Kim ,  Olga I. Vassilieva ,  Paparao Palacharla ,  Tadashi Ikeuchi

    IPC分类号： H04L1/00 ,  H04B10/54 ,  H04B10/27

    摘要： An optical transmitter for probabilistic shaping and symbol rate optimization includes one or more matcher elements, each configured to assign respective probabilities to symbols represented in received binary data dependent on a target probability distribution and to output a respective shaped bit sequence. The optical transmitter further includes a single systematic error correction encoder configured to add parity bits collectively across the shaped bit sequences and to output a combined shaped bit sequence including data representing the shaped bit sequences and the added parity bits. The optical transmitter also includes multiple mapping elements, each configured to generate a respective codeword for each symbol represented in a portion of the combined shaped bit sequence, a serial-to-parallel converter to provide portions of the combined shaped bit sequence to the mapping elements, and a multiplexer to combine binary data representing the codewords for transmission using subcarrier multiplexing.

    Spectral slot assignment and placement of wavelength shifters in flexible grid optical networks
    2.
    发明授权
    Spectral slot assignment and placement of wavelength shifters in flexible grid optical networks 有权

    公开(公告)号：US10348439B1

    公开(公告)日：2019-07-09

    申请号：US15978879

    申请日：2018-05-14

    申请人： Fujitsu Limited

    发明人： Inwoong Kim ,  Xi Wang ,  Paparao Palacharla ,  Tadashi Ikeuchi

    IPC分类号： H04J14/02 ,  H04L12/24 ,  H04Q11/00

    摘要： A control system for spectral slot assignment in flexible grid optical networks determines, for a given optical path, a physical source node, a physical destination node, and physical intermediate nodes, determines the number of contiguous spectral slots to allocate for traffic on the path, identifies candidate combinations of spectral slots available for the traffic, and creates an auxiliary graph for the path. The auxiliary graph includes auxiliary links representing candidate combinations of spectral slots, virtual nodes representing pairs of neighboring physical nodes, and auxiliary links between each pair of virtual source-side and destination-side intermediate nodes representing either pass-through traffic or wavelength shifted traffic. The control system assigns cost values to the auxiliary links, determines a lowest cost combination of auxiliary links from the source to the destination, allocates the corresponding candidate combinations of spectral slots to the traffic, and configures the physical intermediate nodes accordingly.

    METHOD AND SYSTEM FOR ASSIGNING MODULATION FORMAT IN OPTICAL NETWORKS
    4.
    发明申请
    METHOD AND SYSTEM FOR ASSIGNING MODULATION FORMAT IN OPTICAL NETWORKS 审中-公开

    公开(公告)号：US20190097747A1

    公开(公告)日：2019-03-28

    申请号：US16154503

    申请日：2018-10-08

    申请人： Fujitsu Limited

    发明人： Inwoong Kim ,  Xi Wang ,  Olga Vassilieva ,  Paparao Palacharla ,  Tadashi Ikeuchi

    IPC分类号： H04J14/02

    CPC分类号： H04J14/0257 ,  H04B10/0793 ,  H04B10/07953 ,  H04J14/026 ,  H04J14/0267 ,  H04J14/0278

    摘要： Systems and methods for identifying a pair of nodes of a plurality of nodes of a virtual optical network (VON); identifying i) an optical route between the pair of nodes and ii) a desired availability of the optical route; determining a probability density function (PDF) of a signal-to-noise ratio (SNR) of a signal of the optical route; determining a SNR threshold such that an integration of the PDF of the SNR of the signal above the SNR threshold corresponds to the desired availability of the optical route; determining a plurality of spectral efficiencies that corresponds to the SNR threshold, each spectral efficiency of the plurality of spectral efficiencies associated with a respective modulation format of a plurality of modulation formats; and identifying a particular modulation format of the plurality of modulation formats that corresponds to a maximum spectral efficiency of the plurality of spectral efficiencies.

    SHORTEST MINIMUM REGENERATION PATH SEARCH IN NETWORKS
    7.
    发明申请
    SHORTEST MINIMUM REGENERATION PATH SEARCH IN NETWORKS 有权

    公开(公告)号：US20170346593A1

    公开(公告)日：2017-11-30

    申请号：US15169235

    申请日：2016-05-31

    申请人： Fujitsu Limited

    发明人： Inwoong Kim ,  Xi Wang ,  Qiong Zhang ,  Paparao Palacharla ,  Tadashi Ikeuchi

    IPC分类号： H04J14/02

    CPC分类号： H04J14/0267 ,  H04J2203/0023 ,  H04J2203/0055 ,  H04J2203/0094 ,  H04J2203/0098 ,  H04L45/12 ,  H04L45/62

    摘要： Methods and systems are provided for determining a shortest minimum regeneration path in an optical network. The method includes creating a virtual node at a source node, the source node communicatively coupled to a destination node through a plurality of nodes and links. The method includes traversing the virtual nodes, wherein traversing the virtual nodes comprises selecting an unvisited virtual node at a node; identifying a candidate virtual node from the unvisited virtual node; determining whether the candidate virtual node exceeds a maximum permitted weight; determining whether the candidate virtual node violates a shortest minimum regeneration path condition; and creating the new virtual node from the candidate virtual node if the candidate virtual node does not exceed the maximum permitted weight and if the candidate virtual node does not violate the shortest minimum regeneration path condition.

    SYSTEM AND METHOD FOR MONITORING POWER IMBALANCE INDUCED BY POLARIZATION-DEPENDENT LOSS
    10.
    发明申请
    SYSTEM AND METHOD FOR MONITORING POWER IMBALANCE INDUCED BY POLARIZATION-DEPENDENT LOSS 审中-公开
    用于监测由极化依赖性损失引起的功率不平等的系统和方法

    公开(公告)号：US20150117856A1

    公开(公告)日：2015-04-30

    申请号：US14067451

    申请日：2013-10-30

    申请人： Fujitsu Limited

    发明人： Olga Vassilieva ,  Inwoong Kim ,  Jeng-Yuan Yang ,  Motoyoshi Sekiya

    IPC分类号： H04B10/077

    CPC分类号： H04B10/0775 ,  H04B10/2572

    摘要： Systems and methods for monitoring a dual-polarization signal are disclosed. The systems and methods include extracting a portion of the dual-polarization signal, wherein the dual-polarization signal includes multiple supervisory signals, each associated with a polarization component of a main data signal, measuring a power level of the first and second supervisory signals, and determining a power imbalance between the polarization components of the main data signal based at least on the power level.

    摘要翻译： 公开了用于监测双极化信号的系统和方法。 所述系统和方法包括提取双极化信号的一部分，其中双极化信号包括多个监控信号，每个监控信号与主数据信号的偏振分量相关联，测量第一和第二监控信号的功率电平， 以及至少基于所述功率电平来确定所述主数据信号的所述偏振分量之间的功率不平衡。