Abstract
The performance of future ultra-long haul communication systems exploiting
phase-encoded signals is likely to be compromised by noise generated during
signal transmission. One potential way to mitigate such noise is to use
Phase Sensitive Amplifiers (PSAs) which have been demonstrated to help
remove phase as well as amplitude noise from phase-encoded signals.
Recently, we showed that a PSA-based signal regenerator based on degenerate
four-wave mixing can be implemented in a network-compatible manner in which
only the (noisy) signal is present at the device input (black-box
operation). The developed regenerator was also able to perform simultaneous
wavelength conversion and multicasting, details/analysis of which are
presented herein. However, this scheme was tested only with artificial noise
generated in the laboratory and with the regenerator placed in front of the
receiver, rather than in-line where even greater performance benefits are to
be expected. Here, we address both theoretically and experimentally the
important issue of how such a regenerator, operating for convenience in a
multicasting mode, performs as an in-line device in an installed
transmission fiber link. We also investigate the dispersion tolerance of the
approach.
© 2011 IEEE
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