公开(公告)号：US09813157B2

公开(公告)日：2017-11-07

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: H04B10/00 ,  H04B10/2581 ,  H04L25/03 ,  H04B10/2543 ,  H04B10/69

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.