Performance analysis of wavelength conversion using a light-injected laser diode based on improved rate equations

The extinction and signal to noise ratios, the two main figures-of-merit for a wavelength converted signal are analyzed on the basis of the improved rate equations. The model accurately considers the mutual coupling parameter βm which indicates the efficiency of the wavelength conversion. A simple relationship among extinction ratio, signal to noise ratio and the mutual coupling parameter βm is given. With the simulation results, we find that the high extinction and signal to noise ratios depends on higher pump (i.e. original) power, optimum probe (i.e. converted) power and less wavelength spacing between them, which is in accordance with the analysis of mutual coupling parameter βm.