公开(公告)号：US20160261344A1

公开(公告)日：2016-09-08

申请号：US15062179

申请日：2016-03-06

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoling ZHANG ,  Fatih YAMAN ,  Yue-Kai HUANG ,  Ezra IP ,  Yoshihisa INADA

IPC: H04B10/2507 ,  H04B10/2581 ,  H04L25/03

CPC classification number: H04B10/2581 ,  H04B10/2543 ,  H04B10/6971 ,  H04L25/03885

Abstract: Aspects of the present disclosure are directed to the mitigation of multi-path interference from quasi-single-mode fiber using hybrid span configuration and digital signal processing wherein a hybrid span of quasi-single mode fibers and single-mode fibers are used to configure the hybrid span. Additional aspects are directed to introducing a low-baud rate sub-banding signal to reduce the number of DD-LMS taps required when compensating the multi-path interference as the low-baud rate signal requires fewer taps to cover a given range of MPI as compared to a high-baud rate signal. Finally further aspects are directed to an ALMS equalizer which further reduces the number of equalizer taps by shifting its center tap towards the right if higher-order modes transmit slower than a fundamental mode, otherwise the center tap is shifted to the left.

Abstract translation: 本公开的方面涉及使用混合跨度配置和数字信号处理来缓解来自准单模光纤的多径干扰，其中使用准单模光纤和单模光纤的混合跨度来配置 混合跨度 另外的方面是引入低波特率子带信号来减少在补偿多路径干扰时所需的DD-LMS抽头的数量，因为低波特率信号需要更少的抽头来覆盖给定的MPI范围作为 与高波特率信号相比。 最后，还有一些方面针对ALMS均衡器，如果高阶模式的传输速度比基本模式慢，则通过将其中心抽头向右移动来进一步减少均衡器抽头的数量，否则中心抽头向左移位。