Abstract
DFB (Distributed Feedback) lasers do not use conventional resonator mirrors, but provide feedback via backward Bragg scattering from periodic modulations of refractive index and/or gain of the iaser medium. An important feature is the high spectral selectivity which originates in the Bragg effect and allows selection of longitudinal modes |l|. Hitherto, DFB theories were restricted to small modulations |2,3,4,5|. In this paper, we study the effects of strong DFB modulations on the basis of a complex Hill equation which can be solved analytically. This procedure provides for the first time a direct access to the complex characteristics of future DFB lasers with strong modulations.
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