Title :
Modulation formats suitable for ultrahigh spectral efficient WDM systems
Author :
Bosco, G. ; Carena, A. ; Curri, V. ; Gaudino, R. ; Poggiolini, P.
Author_Institution :
Dipt. di Elettronica, Politecnico di Torino, Italy
Abstract :
We analyze the performance of four different modulation formats in ultrahigh spectral efficient wavelength-division multiplexing (WDM) systems. Besides standard nonreturn-to-zero intensity modulation, we analyze duobinary, differential phase-shift keying (DPSK), and carrier-suppressed return-to-zero (CSRZ)-DPSK and, for each of them, optimize several system parameters, such as filtering and dispersion map. First, we optimize transmitter and receiver parameters in back-to-back condition, then we study the performance in a multispan scenario and its dispersion map optimization. Duobinary, DPSK, and CSRZ-DPSK show high suitability for ultrahigh spectral efficient WDM systems and high resilience to dispersion compensation tolerances and fiber nonlinearities. The investigation is based on detailed simulative analyses.
Keywords :
differential phase shift keying; intensity modulation; intersymbol interference; optical fibre communication; optical fibre dispersion; optical filters; optical modulation; optical receivers; optical transmitters; wavelength division multiplexing; carrier-suppressed return-to-zero-DPSK; differential phase shift keying; dispersion compensation tolerance; dispersion map; duobinary phase shift keying; fiber nonlinearities; filtering map; modulation formats; nonreturn-to-zero intensity modulation; optical transmission systems; receiver parameters; transmitter parameters; ultrahigh spectral efficient WDM systems; ultrahigh spectral efficient wavelength division multiplexing systems; Crosstalk; Differential quadrature phase shift keying; Filtering; Optical fiber dispersion; Optical filters; Optical modulation; Optical receivers; Optical transmitters; Resilience; Wavelength division multiplexing; DPSK; Differential phase-shift keying; duobinary; optical fiber dispersion; optical modulation; wavelength-division multiplexing;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2004.827830
