Abstract
We propose a joint digital preequalization scheme for a Nyquist wavelength division
multiplexing (N-WDM) system to compensate for the intersymbol interference caused by a limited
channel bandwidth or aggressive prefiltering. A digital raised-cosine pulse filter is implemented
before the reference-based preequalization scheme to enhance the tolerance of the signal to the
crosstalk from adjacent channels. The experiment illustrates eight-channel
digital–analog-converter generation of the polarization division multiplexing quadrature phase
shift keying system at 112 Gb/s per channel on a 25-GHz grid, adopting the reference-based digital
preequalization considering narrow-band optical filtering effect at the transmitter. The
experimental results show that the proposed preequalization scheme allows for an ultradense
channel spacing of 0.89 times of the baud rate in the super N-WDM system with a as large as 5-dB
optical signal-to-noise ratio improvement.
© 2013 IEEE
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