Title :
Investigation of 10-Gb/s optical DQPSK systems in presence of chromatic dispersion, fiber nonlinearities, and phase noise
Author :
Gené, Joan M. ; Soler, Marçal ; Killey, Robert I. ; Prat, Josep
Author_Institution :
Dept. of Signal Theor. & Commun., Univ. Politecnica de Catalunya, Barcelona, Spain
fDate :
3/1/2004 12:00:00 AM
Abstract :
The impact of phase noise, chromatic dispersion, and nonlinear effects on a 10-Gb/s optical differential quadrature phase-shift keying (oDQPSK) system has been evaluated by computer simulations. Both single channel and multiple wavelength-division-multiplexing channels have been considered. The results show that the low spectral width of this format allows a reduced channel spacing as low as 25-12.5 GHz. Furthermore, the use of this format leads to an increase in dispersion tolerance together with a robustness to nonlinear effects due to the signal near constant envelope characteristics. Finally, simulations show that phase noise can be the limiting factor of oDQPSK systems.
Keywords :
channel spacing; differential phase shift keying; multiwave mixing; optical communication equipment; optical fibre communication; optical fibre dispersion; phase noise; quadrature phase shift keying; self-phase modulation; wavelength division multiplexing; 10 Gbit/s; 12.5 to 25 GHz; channel spacing; chromatic dispersion; dispersion tolerance; multiple wavelength-division-multiplexing channels; optical DQPSK; optical differential quadrature phase-shift keying; phase noise; signal near constant envelope; single channel; spectral width; Chromatic dispersion; Fiber nonlinear optics; Nonlinear optics; Optical mixing; Optical modulation; Optical noise; Optical receivers; Optical sensors; Optical transmitters; Phase noise;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.823698
