Abstract
We have designed a practical, tunable wavelength converter, using cascaded two-stage single-pump
degenerated four-wave mixing processes in polarization-maintaining highly nonlinear fibers, employed in conjunction
with a polarization-diversity scheme. This made it possible to achieve stable and high-quality operation of
guard-band-less and polarization-insensitive tunable wavelength conversion for an 86-Gbit/s dual-polarization
quadrature phase-shift keying signal over the operating bandwidth of 1535–1565 nm. Two factors of signal
quality degradation during the conversion process were analyzed. First, the total amount of the amplified spontaneous
emission (ASE) noise accumulated in the converter was studied theoretically. This leads to some important converter
design parameters to improve the suppression of the signal quality degradation due to the ASE noise. Second, the
increased phase error of the converted signal was investigated using a theoretical prediction, which was confirmed by
an experimental study.
© 2014 IEEE
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