Reduction of Crosstalk Influence in a 7-Core Multicore Fiber by Frequency Interleave

Shun ORII  Kyo INOUE  Koji IGARASHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E102-B   No.8   pp.1590-1594
Publication Date: 2019/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3323
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
multicore fiber transmission,  WDM,  crosstalk,  frequency interleave,  hexagonal close-packed multicore fiber,  

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Summary: 
Wavelength-division multiplexing multicore fibers can transmit a large amount of information over one fiber, and high-density core allocations enable a large number of fiber lines to be deployed in limited spaces. However, inter-core crosstalk degrades the signal in these systems. This paper describes the design of a frequency interleaving scheme for a 7-core hexagonal multicore fiber. Interleaving schemes shift signal spectra between neighboring cores to reduce the signal degradation caused by inter-core crosstalk. The channel frequency allocation that most efficiently lowers the bit error rate is numerically determined in this study. The results indicate that the optimum frequency interleaving improves the allowable crosstalk ratio by 6.3 dB for QPSK signals, demonstrating its potential for improving wavelength-division multiplexing multicore fiber transmission systems.