Mitigation of multi-path interference from quasi-single-mode fiber using hybrid span configuration and digital signal processing

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United States of America Patent

PATENT NO 9813157
SERIAL NO

15062179

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Abstract

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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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Patent Owner(s)

  • NEC CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Huang, Yue-Kai Princeton, US 66 439
Inada, Yoshihisa Tokyo, JP 51 138
Ip, Ezra Plainsboro, US 50 190
Yaman, Fatih Monmouth Junction, US 73 423
Zhang, Shaoling Princeton, US 5 12

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