Title :
APSK Modulated CO-OFDM System With Increased Tolerance Toward Fiber Nonlinearity
Author :
Wang, Hui ; Li, Yan ; Yi, Xiaogang ; Kong, Deming ; Wu, Jian ; Lin, Jintong
Author_Institution :
State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
fDate :
7/1/2012 12:00:00 AM
Abstract :
An amplitude and phase-shift keying (APSK) modulated coherent optical orthogonal frequency-division-multiplexing (CO-OFDM) system is proposed, with increased tolerance toward fiber nonlinearity. Numerical simulation results, based on 30.2-Gb/s single-channel and 5×30.2-Gb/s wavelength-division-multiplexing (WDM) single-polarization CO-OFDM systems, show that compared with conventional 16 quadrature amplitude modulation (QAM) modulated optical OFDM signal, the 16 APSK modulated optical OFDM signal has a higher tolerance toward fiber nonlinearity, such as self-phase modulation and cross-phase modulation. The optimal launch power and the corresponding Q2 factor are, respectively, 2 and 0.5 dB higher than 16 QAM modulated optical OFDM signal after 640-km transmission, both in single-channel and WDM CO-OFDM systems.
Keywords :
OFDM modulation; amplitude shift keying; optical fibre communication; quadrature amplitude modulation; APSK modulated CO-OFDM system; amplitude phase-shift keying; coherent optical orthogonal frequency-division-multiplexing system; cross-phase modulation; fiber nonlinearity; optimal launch power; quadrature amplitude modulation; self-phase modulation; single-channel; Fiber nonlinear optics; Modulation; Optical fibers; Peak to average power ratio; Amplitude and phase-shift keying (APSK); fiber nonlinearity; orthogonal frequency-division-multiplexing (OFDM); quadrature amplitude modulation (QAM);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2194733
