All-optical inverted and noninverted wavelength conversion using two-cascaded semiconductor optical amplifiers

A two-cascaded semiconductor optical amplifier 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 noninverted signal. The all-optical noninverted wavelength conversion feasibility is also demonstrated delivering an extinction ratio higher than 7 dB over a wide range of wavelengths.