Title :
Impact of nonlinear phase noise on direct-detection DQPSK WDM systems
Author :
Huang, Xuetian ; Zhang, Lei ; Zhang, Min ; Ye, Peida
Author_Institution :
Key Lab. of Opt. Commun. & Lightwave Technol., Beijing Univ. of Posts & Telecommun., China
fDate :
7/1/2005 12:00:00 AM
Abstract :
The performance degradation of differential quadrature phase-shift keying (DQPSK) wavelength-division-multiplexed (WDM) systems due to self-phase modulation (SPM)- and cross-phase modulation (XPM)-induced nonlinear phase noise is evaluated in this letter. The XPM-induced nonlinear phase noise is approximated as Gaussian distribution and summed together with the SPM-induced nonlinear phase noise. We demonstrate that 10-Gb/s systems, whose walkoff length is larger than 40-Gb/s systems´, are more sensitive to XPM-induced nonlinear phase noise than 40-Gb/s systems. Furthermore, DQPSK WDM systems show lower tolerance to both SPM- and XPM-induced nonlinear phase noise than differential phase-shift keying WDM systems.
Keywords :
Gaussian distribution; differential phase shift keying; optical fibre communication; phase noise; quadrature phase shift keying; self-phase modulation; wavelength division multiplexing; 10 Gbit/s; 40 Gbit/s; DQPSK systems; Gaussian distribution; WDM systems; cross-phase modulation; differential quadrature phase shift keying; direct-detection systems; nonlinear phase noise; performance degradation; self-phase modulation; wavelength-division multiplexing; Differential phase shift keying; Error probability; Gaussian distribution; Nonlinear optics; Optical receivers; Phase modulation; Phase noise; Phase shift keying; Signal to noise ratio; Wavelength division multiplexing; Optical communication; phase noise; phase-shift keying;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.848274
