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    JOINT TRANSMITTER AND RECEIVER MAP ALGORITHM FOR ENHANCING FILTERING TOLERANCE IN A BANDWIDTH-LIMITED SYSTEM
    33.
    发明申请
    JOINT TRANSMITTER AND RECEIVER MAP ALGORITHM FOR ENHANCING FILTERING TOLERANCE IN A BANDWIDTH-LIMITED SYSTEM 有权
    联合发射机和接收机映射算法，用于增强带宽有限系统中的滤波容限

    公开(公告)号：US20160105297A1

    公开(公告)日：2016-04-14

    申请号：US14844909

    申请日：2015-09-03

    Applicant: NEC Laboratories America, Inc.

    Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Yue-Kai Huang

    IPC: H04L25/03 ,  H04B10/61 ,  H04B10/58

    CPC classification number: H04L25/03859 ,  H04B10/2507 ,  H04B10/58 ,  H04B10/616 ,  H04L25/03171 ,  H04L25/03343

    Abstract: A system for optimizing signal quality in an optical communication system is provided including a transmitter for converting digital signals to optical signals, the transmitter including a transmitter digital signal processing chip including a pre-distortion logic and a transmitter look-up table (LUT). A receiver is operatively coupled to the transmitter for receiving and converting the optical signals from the transmitter to digital signals. The receiver includes a receiver digital signal processing chip including a correction logic and a receiver look-up table (LUT). The transmitter LUT is constructed by scaling the receiver LUT by a weight factor and is iteratively updated based on a weighted sum of the receiver LUT.

    Abstract translation: 提供了一种用于优化光通信系统中的信号质量的系统，包括用于将数字信号转换为光信号的发射机，该发射机包括包含预失真逻辑和发射机查找表（LUT）的发射机数字信号处理芯片。 接收机可操作地耦合到发射机，用于接收和转换从发射机到数字信号的光信号。 该接收机包括一个包括校正逻辑和接收机查找表（LUT）的接收机数字信号处理芯片。 发射机LUT是通过将接收机LUT缩放权重因子来构建的，并且基于接收机LUT的加权和重复地更新发射机LUT。

    CENTRALIZED AUTOMATIC BIAS CONTROL SYSTEM AND METHOD FOR MULTIPLE OPTICAL MODULATORS
    34.
    发明申请
    CENTRALIZED AUTOMATIC BIAS CONTROL SYSTEM AND METHOD FOR MULTIPLE OPTICAL MODULATORS 有权
    用于多光学调制器的集中自动偏置控制系统和方法

    公开(公告)号：US20160028475A1

    公开(公告)日：2016-01-28

    申请号：US14808414

    申请日：2015-07-24

    Applicant: NEC Laboratories America, Inc.

    Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Yue-Kai Huang ,  Ting Wang

    IPC: H04B10/077 ,  H04B10/564 ,  G02F1/01

    CPC classification number: H04B10/0775 ,  G02F1/0123 ,  H04B10/50575 ,  H04B10/564 ,  H04B2210/075

    Abstract: A system for centralized automatic bias control for a plurality of modulators, including a coupler for coupling output of each of the plurality of modulators to generate a combined modulator output. A pilot insertion device inserts a pilot tone into each of the plurality of modulators such that a different pilot tone frequency is inserted for each of the plurality of modulators. A monitoring device iteratively monitoring power (Pt) of each inserted pilot tone over time to determine whether a current modulator bias is optimal for each of the plurality of modulators, and an adjuster device iteratively adjusts the modulator bias for each of the plurality of modulators for which the current modulator bias is determined to be sub-optimal until a threshold condition has been met.

    Abstract translation: 一种用于多个调制器的集中自动偏置控制的系统，包括用于耦合所述多个调制器中的每一个的输出的耦合器以产生组合的调制器输出。 导频插入装置将导频音插入到多个调制器中的每一个中，使得为多个调制器中的每一个插入不同的导频音频率。 一种监测装置，迭代地监视随时间推移的每个插入的导频音的功率（Pt），以确定所述多个调制器中的每个调制器的当前调制器偏置是否最佳，并且调节器装置迭代地调整所述多个调制器中的每一个的调制器偏置，以供 其中电流调制器偏置被确定为次优，直到满足阈值条件。

    Vibration detection using phase recovered from an optical transponder with coherent detection
    35.
    发明授权
    Vibration detection using phase recovered from an optical transponder with coherent detection 有权

    公开(公告)号：US11982552B2

    公开(公告)日：2024-05-14

    申请号：US17544806

    申请日：2021-12-07

    Applicant: NEC Laboratories America, Inc.

    Inventor： Ezra Ip ,  Yue-Kai Huang

    IPC: G01D5/353 ,  G01H9/00 ,  H04B10/61

    CPC classification number: G01D5/35361 ,  G01H9/004 ,  H04B10/6165

    Abstract: Aspects of the present disclosure describe systems, methods. and structures for vibration detection using phase recovered from an optical transponder with coherent detection. Advantageously, our systems, methods, and structures leverage contemporary digital coherent receiver architecture in which various adaptive DSP operations performed to recover transmitted data track optical phase. The phase is extracted at low overhead cost, allowing a digital coherent transponder to perform vibration detection/monitoring as an auxiliary function to data transmission. Demonstration of vibration detection and localization based on the extraction of optical phase from payload-carrying telecommunications signal using a coherent receiver in a bidirectional WDM transmission system is shown and described.

    Polarization diversity combining method in coherent DAS maintaining phase continuity
    37.
    发明授权
    Polarization diversity combining method in coherent DAS maintaining phase continuity 有权

    公开(公告)号：US11692867B2

    公开(公告)日：2023-07-04

    申请号：US17506471

    申请日：2021-10-20

    Applicant: NEC Laboratories America, Inc.

    Inventor： Junqiang Hu ,  Yue-Kai Huang ,  Ezra Ip

    IPC: G01H9/00 ,  G02B6/42

    CPC classification number: G01H9/004 ,  G02B6/4212

    Abstract: A distributed optical fiber sensing (DOFS)/distributed acoustic sensing (DAS) method employing polarization diversity combining and spatial diversity combining for a DOFS/DAS system wherein the polarization diversity combining determines a temporal average product for each beating product, determines one having a max average power, rotates that one having max average power for its phase shift to produce a reference, determines a phase difference for each beating product as compared to the reference, compensates any phase difference such that all beating products exhibit a well-aligned phase; and combining the beating products; and wherein the spatial diversity combining uses the combined beating products for each location, determines a temporal average power, determines a location having a greatest average power; and combines the results and provides an indicia of the combined result(s).

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