Abstract
We address design and optimization of optical filters for spectrum-sliced
wavelength division multiplexed (SS-WDM) systems employing saturated
semiconductor optical amplifiers (SOAs) to suppress intensity noise. We
study the impact of the shape of both slicing and channel selecting optical
filters vis-à-vis two important impairments: the filtering effect
and the crosstalk. The quantification of bit error rate (BER) is made
possible by a parallel implementation of the multicanonical Monte Carlo
algorithm. The intensity noise suppression by the SOA and signal degradation
by subsequent optical filtering are studied both numerically and
experimentally. We find optical filter shape and bandwidth that minimizes
BER.By varying channel spacing and width, we estimate the achievable spectral
efficiency when using both noise-cleaning SOA and forward error correction.
We show that when constrained to use a symmetric architecture, i.e.,
identical filters for both slicing and channel selecting filters, there is a
degradation in achievable spectral efficiency. We show that noise
suppression is robust to variations in relative channel powers in
multichannel systems. Our numerical simulations, vetted experimentally,
provide accurate and quantitative results on optimized system
performance.
© 2009 IEEE
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