Abstract
An approximate analysis of the nonlinear operation of the DFB laser with complex coupling coefficient is presented. An expression relating the small signal gain to the output power and structure parameters including the spatial hole burning effect is obtained. The effect of the gain grating, the loss grating, and the coupling via the higher Bragg order grating is discussed. It is shown that the effect of the `negative' gain is possible. This effect depends on the output power level, the distributed loss level, and the spatial hole burning effect.
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