Abstract
We carry out comprehensive analysis on the fiber nonlinearity impact on the block-wise phase switching
(BPS) direct detection (DD) systems. We find that the degenerate four-wave mixing components produced by the
interaction between the main carrier and the subcarriers are intrinsically compensated through the direct detection
process. For a 100-Gb/s BPS–DD system over 80-km standard single-mode-fiber link, the optimum launch power is
found to be 5 dBm, and the optimum carrier-to-signal power ratio is 12 dB. For a single-channel BPS–DD
system, the fiber nonlinearity impairment is reduced when low-dispersion fiber is used. However, for a multi-channel
BPS–DD system, the nonlinearity noise induced by the crosstalk among the channels is enhanced when the chromatic
dispersion of the fiber link decreases.
© 2014 IEEE
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