We have developed a rigorous electromagnetic analysis of the DFB laser, where the corrugations, seen as a cascade of interacting discontinuities, need not be periodic nor “small.” This takes into account the continuous spectrum of radiation modes excited at each discontinuity and their interaction between successive discontinuities without assuming periodicity. The analysis of the individual discontinuity is based on the newly developed concept of “transition function.’’ The analysis of the cascade of discontinuities takes place by generalized transfer-matrix methods (including the continuum) therefore bypassing the need for a “periodic unit cell.” This enables us to model exactly the total diffraction generated by the grating. Threshold-current densities against active-layer width are compared where possible, with theoretical results available in the literature for the periodic case, showing good general agreement. Radiation patterns of the gratings are provided. Furthermore different shapes of corrugation are analyzed.

A rigorous analysis of DFB lasers with large and aperiodic corrugations / Rozzi, Tullio; Chiaraluce, Franco; M., Lanari. - In: IEEE JOURNAL OF QUANTUM ELECTRONICS. - ISSN 0018-9197. - 27:(1991), pp. 212-223. [10.1109/3.78222]

A rigorous analysis of DFB lasers with large and aperiodic corrugations

ROZZI, TULLIO;CHIARALUCE, FRANCO;
1991-01-01

Abstract

We have developed a rigorous electromagnetic analysis of the DFB laser, where the corrugations, seen as a cascade of interacting discontinuities, need not be periodic nor “small.” This takes into account the continuous spectrum of radiation modes excited at each discontinuity and their interaction between successive discontinuities without assuming periodicity. The analysis of the individual discontinuity is based on the newly developed concept of “transition function.’’ The analysis of the cascade of discontinuities takes place by generalized transfer-matrix methods (including the continuum) therefore bypassing the need for a “periodic unit cell.” This enables us to model exactly the total diffraction generated by the grating. Threshold-current densities against active-layer width are compared where possible, with theoretical results available in the literature for the periodic case, showing good general agreement. Radiation patterns of the gratings are provided. Furthermore different shapes of corrugation are analyzed.
1991
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/50705
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