Analysis of wavelength conversion using highly nondegenerate four-wave mixing in /spl lambda//4-shifted DFB lasers

We present a theoretical analysis of terahertz-range wavelength conversion using highly nondegenerate four-wave mixing in /spl lambda/=1.55 /spl mu/m, medium-coupling /spl lambda//4-shifted distributed feedback (DFB) lasers. Based on the coupled-wave approach, our model predicts up to /spl sim/2 THz probe-pump detuning with a -20 dB or higher conversion efficiency for quantum-well /spl lambda//4-shifted DFB. The influences of pump power and DFB coupling strength (/spl kappa/L) on wave mixing as well as the Bragg reflection effects are discussed. The predictions of the model are found to be in good agreement with recent experimental observations.