Abstract
In this paper, we investigate lower bounds of optical-signal-to-noise
ratio (OSNR) for three types of electronic digital-signal-processing (DSP)
receivers, which are used for an intensity-modulated and
direct-photo-detected optical transmission link. Target is to determine the
performance bound of this transmission link if equalization and/or forward
error correction (FEC) are used. The investigated DSP methods are hard-input
FEC decoding, soft-input FEC decoding, and sequence detection. The impact of
chromatic and polarization mode dispersion, as well as the effect of code
rate on the bounds, is shown. Signal statistics are computed analytically.
Several implementations of coding and detection schemes, such as
Reed–Solomon (RS) and low-density parity-check (LDPC) decoding as
well as Turbo equalization, are investigated, and we show the distance of
their performances to the derived bounds in quite some detail.
© 2009 IEEE
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