Maximum Transmitter Power Set by Fiber Nonlinearity-Induced Bit Error Rate Floors in Non-Repeatered Coherent DWDM Systems

Xin ZHANG  Yasuhiro AOKI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E102-B   No.6   pp.1140-1147
Publication Date: 2019/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3259
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
fiber optics communications,  coherent communication,  nonlinear optics,  high power transmission,  optical fiber,  

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Summary: 
We have comprehensively studied by numerical simulation high power transmission properties through single mode fiber for non-repeatered system application. We have clearly captured bit error rates (BERs) of digital coherent signal exhibit specific floor levels, depending on transmitter powers, due to fiber nonlinearity. If the maximum transmitter powers are defined as the powers at which BER floor levels are 1.0×10-2 without error correction, those are found to be approximately +20.4dBm, +14.8dBm and +10.6dBm, respectively, for single-channel 120Gbps DP-QPSK, DP-16QAM and DP-64QAM formats in large-core and low-loss single-mode silica fibers. In the simulations, we set fiber lengths over 100km, which is much longer than the effective fiber length, thus the results are applicable to any of long-length non-repeatered systems. We also show that the maximum transmitter powers gradually decrease in logarithmic feature with the increase of the number of DWDM channels. The channel number dependence is newly shown to be almost independent on the modulation format. The simulated results have been compared with extended Gaussian-Noise (GN) model with introducing adjustment parameters, not only to confirm the validity of the results but to explore possible new analytical modeling for non-repeatered systems.