Abstract
In this study we present the influence imposed by the coexistence of
wavelength division multiplexed (WDM) channels on a chaotic optical
communication system tested in an installed network environment. Both
conventional carriers that carry 10 Gb/s data sequences and chaotic carriers
used for data-encrypted channel transmission have been considered in a dense
WDM configuration. Inter-channel interference, channel polarization and
cross-phase modulation are some dominant phenomena identified to affect the
synchronization process of well-match chaotic optical oscillators. The
efficiency of data recovery of the conventional and chaos encrypted channels
is analyzed. 1.25 Gb/s data sequences, that are completely hidden propagate
along the transmission link, are finally recovered by the authorized
receiver—using forward error correction (FEC)
methods—with bit error rates (BER) below $10<sup>-12</sup>, for channel spacing of 0.8 nm and in parallel polarized adjacent
channels. When orthogonal polarization states are employed the channel
spacing can be further reduced to 0.65 nm without sacrificing in the
recovery performance.
© 2010 IEEE
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