Nonlinear Phase-Shift Cancellation by Taking the Geometric Mean of WDM-Signal Phase-Conjugate Pair

Takahisa KODAMA
Takayuki MIZUNO
Masafumi KOGA

IEICE TRANSACTIONS on Communications   Vol.E101-B    No.8    pp.1845-1852
Publication Date: 2018/08/01
Publicized: 2018/02/09
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3351
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment for Communications
fiber nonlinearity,  nonlinearity mitigation,  optical fiber communication,  optical phase-conjugation,  wavelength division multiplexing,  

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This paper investigates approaches that can cancel nonlinear phase noise effectively for the phase-conjugate pair diversity transmission of 16-QAM WDM signals through multi-core fiber. The geometric mean is introduced for the combination of the phase-conjugate pair. A numerical simulation suggests that span-by-span chromatic dispersion compensation is more effective at cancelling phase noise in long distance transmission than lumped compensation at the receiver. Simulations suggest the span-wise compensation described herein yields Q-value enhancement of 7.8 and 6.8dB for CD values of 10 and 20.6ps/nm/km, respectively, whereas the lumped compensation equivalent attains only 3.5dB. A 1050km recirculating loop experiment confirmed a Q-value enhancement of 4.1dB for 20.6ps/nm/km, span-wise compensation transmission.