Analysis of multiple wavelength DFB fiber lasers

The behavior of multiwavelength distributed feedback fiber lasers is simula ted in a comprehensive numerical model, Multiple fundamental modes can coex ist, even though the coupling coefficients of their respective refractive i ndex gratings are not equal, due to induced dynamic gain gratings, We have investigated the effect on the lasing state of variations in coupling stren gths, gain parameters, grating Bragg frequency separation, relative phase b etween the gratings, length of the structure relative to the beat lengths b etween the gratings, grating center phase-shift errors, and saturation leve l of the UV-induced refractive index change. index change.