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Modulation formats suitable for ultrahigh spectral efficient WDM systems

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5 Author(s)
Bosco, G. ; Dipt. di Elettronica, Politecnico di Torino, Italy ; Carena, A. ; Curri, V. ; Gaudino, R.
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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.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:10 ,  Issue: 2 )