Abstract
Nyquist pulse shaping can be used to increase the spectral efficiency
(SE) by narrowing the signal spectrum without introducing intersymbol interference
in a wavelength-division-multiplexed (WDM) system. In this paper, we investigate
the complexity and performance of pulse shaping at the transmitter side using
digital finite-impulse-response (FIR) or frequency-domain-equalization (FDE)
filters to increase the SE in a polarization-division-multiplexed quadrature-phase-shift-keyed
WDM system. Simulation results show that FIR filters with 17 taps allow for
a reduction in channel spacing to 1.1 times the symbol rate within a 1 dB
penalty. The root-raised-cosine spectrum shape has better performances than
the raised-cosine spectrum shape with that channel spacing. An FDE filter
with a fast Fourier transform size of 64 and an overlap length of 8 points
performs slightly better than a 17-tap FIR filter.
© 2012 IEEE
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