Abstract
The impact of the signal and nonlinearity extinction ratios on the optimum
parameters of a reamplification and reshaping (2R) all-optical regenerator
is investigated for different nonlinearity characteristic shapes. The bit
error ratio (BER) is numerically evaluated along the 2R all-optical regenerator
chain using the rigorous distribution and the Gaussian distribution for the
optical power. It is shown that, when the extinction ratio of the signal at
the transmitter output decreases, the optimum nonlinearity threshold increases.
The results also show that, independent of the nonlinearity characteristic
shape, the requirements on the extinction ratio of the nonlinearity can be
strongly relaxed when the extinction ratio of the nonlinearity is higher than
the extinction ratio of the signal at the transmitter output. Numerical results
show that, only for nonlinearities with a small degree of nonlinearity and
small extinction ratio, the Gaussian distribution correctly estimates the
optimum regenerator parameters. For a small extinction ratio of the nonlinearity
or a small extinction ratio of the signal at the transmitter output, the
Gaussian distribution only provides correct estimates of the minimum BER along
the regeneration chain. Furthermore, for high and moderate extinction ratios
and degrees of nonlinearity, and for high and moderate extinction ratios of
the signal at the transmitter output, the Gaussian distribution fails to correctly
estimate the optimum regenerator parameters and minimum BER.
© 2008 IEEE
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