Open AccessAnalytical modeling of a single channel nonlinear fiber optic system based on QPSK
Author(s) -
Shiva Kumar,
Sideri Shahi,
Dong Yang
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.027740
Subject(s) - optics , nonlinear system , phase shift keying , spectral density , physics , gaussian , amplified spontaneous emission , distortion (music) , four wave mixing , nonlinear distortion , optical fiber , channel (broadcasting) , nonlinear optics , bit error rate , computational physics , bandwidth (computing) , telecommunications , computer science , quantum mechanics , amplifier , laser
A first order perturbation theory is used to develop analytical expressions for the power spectral density (PSD) of the nonlinear distortions due to intra-channel four-wave mixing (IFWM). For non-Gaussian pulses, the PSD can not be calculated analytically. However, using the stationary phase approximations, we found that convolutions become simple multiplications and a simple analytical expression for the PSD of the nonlinear distortion is found. The PSD of the nonlinear distortion is combined with the amplified spontaneous emission (ASE) PSD to obtain the total variance and bit error ratio (BER). The analytically estimated BER is found to be in good agreement with numerical simulations.