Invention Application
- Patent Title: MITIGATION OF MULTI-PATH INTERFERENCE FROM QUASI-SINGLE-MODE FIBER USING HYBRID SPAN CONFIGURATION AND DIGITAL SIGNAL PROCESSING
- Patent Title (中): 使用混合超音速配置和数字信号处理从单模光纤减少多路干扰
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Application No.: US15062179Application Date: 2016-03-06
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Publication No.: US20160261344A1Publication Date: 2016-09-08
- Inventor: Shaoling ZHANG , Fatih YAMAN , Yue-Kai HUANG , Ezra IP , Yoshihisa INADA
- Applicant: NEC Laboratories America, Inc.
- Main IPC: H04B10/2507
- IPC: H04B10/2507 ; H04B10/2581 ; H04L25/03

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.
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