Abstract
Nyquist Wavelength division multiplexing (N-WDM), is a promising scheme in order
to enhance the spectral efficiency of future coherent optical communication systems. In
N-WDM systems, the channel bandwidth and spacing are selected to maximize the spectral
efficiency while maintaining acceptable levels of inter-carrier and inter symbol
interference. To further increase the spectral efficiency, bandwidth constrained N-WDM,
where baudrate is higher than channel bandwidth can be considered. We propose to combine
the bandwidth-constrained N-WDM scheme with a decision feedback equalizer (DFE) designed
according to the minimum mean square error (MMSE) criterion. We show that the enhanced
resilience to the inter symbol interference offered by DFE provides an effective gain on
spectral efficiency. We compare system benefits of DFE and maximum a posteriori sequence
detection (MAP) for coherent optical receivers, and show that DFE is as efficient as MAP
in mitigating inter symbol interference at a considerably lower complexity.
© 2013 IEEE
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