DYNAMICS OF SPATIAL HOLE-BURNING EFFECTS IN DFB LASERS

A lumped small-signal model for intensity and frequency modulation res ponse of semiconductor lasers, including the effects of longitudinal s patial hole burning (SHE), is presented. It is shown that the laser dy namics including SHE-effects can be accurately described by three smal l-signal rate equations. The simplicity of the model gives new insight into SHE-effects on modulation response and cavity state stability. I t is shown that SHE-effects have a cut-off frequency that depends on t he carrier lifetime (including stimulated recombination) and the feedb ack of perturbations in the longitudinal intensity distribution during modulation.