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Abstract:In this letter, we address one of the essential processes to consider in long Semiconductor Optical Amplifiers (SOAs) analysis, which is the noise. Particularly, we investigate the impact of noise effects on the SOA behavior by measuring the gain, the optical signal to noise ratio and the noise figure, referring to numerical simulations. Although its gain dynamics provide very attractive features of high speed optical signal processing, we show that the noise is strong in long SOAs and can limit the performance of the structure. In order to remedy this, we show that using high bias current at moderate input signal power is recommended.

The focus of this paper is to analyze in detail the nonlinear polarization rotation phenomenon in the Semiconductor Optical Amplifier (SOA) according to the injection conditions. To this end, we have developed a numerical model based on the coupled mode theory and the formalism of Stokes. The obtained results are in agreement with the experimental measurements that have been carried out in free space, which allows optimum control and preservation of the polarization state of the injected and collected signals.

Abstract:In this paper, we will report and characterize the impact of the nonlinear polarization rotation on the behavior of a wavelength converter based on cross-gain modulation effect in a semiconductor optical amplifier (SOA) at 40 Gbit/s. Nevertheless, we investigate and evaluate its performance as function of the intrinsic and extrinsic SOA parameters, such as the bias current, the signal format, the input signal power and its polarization state that determine the magnitude of the polarization rotation by measuring the ellipticity and the azimuth. Also, the impact of noise effects on the structure behavior will be investigated through determining the noise figure. Particularly, we have focused on the performance of an improved wavelength conversion system via the analysis of quality factor and bit error rate referring to numerical simulation.