Sm. Shin et al., Analysis of probe signal power dependence of all-optical wavelength converter using semiconductor optical amplifiers, JPN J A P 1, 40(1), 2001, pp. 159-164
We analyzed the influence of the probe signal power on the wavelength conve
rsion in an interferometric all optical wavelength converter using semicond
uctor optical amplifiers (SOAs). The carrier density variation inside an SO
A due to longitudinal signal amplification and nonradiative recombination i
s investigated and the following variation of amplified spontaneous emissio
n (ASE) is considered. In case of using a high probe signal power, the freq
uency response of the wavelength converter and bit error rate (BER) of the
converted signal are improved as a result of the reductions of ASE noise an
d carrier lifetime.