Gain saturation in DFB lasers with end reflectors

Results of an analysis of gain saturation in distributed feedback (DFB) lasers with end reflectors are presented. The dependence of the gain and frequency-shift eigenvalues of DFB lasers on the properties of end reflectors is reduced by gain-saturation effects. The degree of gain saturation is sensitive to the reflector properties if the distributed feedback and the reflections from the ends are of approximately equal strength.