Theoretical analysis of tunable wavelength conversion based on FWM in semiconductor fiber ring laser

We present a comprehensive broad-band model of tunable wavelength converter based on four-wave mixing (FWM) in semiconductor fiber ring laser (SFRL). Critical factors, e.g., the material gain profile, the longitudinal variation of the optical field, the carrier density and the broad-band spontaneous noise emission are considered in the model. By numerical simulation, the effects of the input signal power, injection current, the coupling of the output coupler and the lasing wavelength on the performance of the wavelength converter, such as the conversion efficiency and the SBR, are investigated. Numerical results are in agreement with the experimental results in literatures.