Abstract
Effects of the incomplete signal exchange on the dynamic range performance
of type II wavelength exchange (WE II, i.e. both pumps are in anomalous
dispersion region) are investigated analytically and experimentally. The
dynamic range here is defined as the tolerable operational range of the
signal power to maintain a nearly complete WE performance. We studied the
case of equal signal powers (balanced signal powers) as well as the case of
unequal signal powers (imbalanced signal powers). It is demonstrated that
the beating between exchanged signal and residual one and the extinction
ratio degradation due to the existence of residual power at original channel
is the major source of the signal quality degradation after WE II. The
experimental results demonstrated dynamic range $\sim$17 dB with bit-error rate (BER) $<10^{-9}$ could be maintained with power penalty of $<$2 dB in the case of balanced signal powers. In the case of
imbalanced signal powers, the dynamic range was $>$8 dB with the power penalty incurred of $\sim$2 dB in the worst case.
© 2009 IEEE
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