Realization of All-Optical Inverted and non-Inverted Wavelength Conversion using Semiconductor Optical Amplifiers at the same Output

A two-cascaded semiconductor optical amplifiers (SOAs) configuration in a counterpropagating topology is proposed for an all-optical wavelength conversion operation. The attractive issue of the proposed method is that the converted signal can be obtained simultaneously with an inverted and non-inverted signal. The all-optical non-inverted wavelength conversion feasibility is also demonstrated delivering an extinction ratio higher than 7 dB over a wide range of wavelength