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Proceedings Paper

Anomalous behavior of coupling coefficient effect and spatial carrier density variation inside sampled grating DFB lasers
Author(s): Magdy Hussein Mourad; Jean-Pierre Vilcot; Didier J. Decoster; Dominique D. Marcenac
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Paper Abstract

All manufactured sampled grating structures are mainly used for `wavelength tunability'. In this paper we succeeded in generating two modes by using Sampled Grating DFB laser. The two modes, will be optically heterodyned on a photodetector for mm-wave (via mode beating) signal generation. The advantage of that design is its size compactness (a single section, single electrode fed with a DC current supply), stable mode spacing, and relatively lower cost compared with other means of mm-wave generation. The simulation results will be presented using the well established model. Two parameters are shown to be affecting on the dual mode spacing and amplitude: the coupling coefficient and the carrier density variation along the (SG) structure. The former (coupling coefficient) mainly influences the mode spacing which is translated into the mm-wave frequency at the photodetector level. The anomalous coupling coefficient behavior leading to a quasi-stable mode spacing independent on the DFB section length increase is studied, interpreted and optimized. The latter (carrier density) plays a dramatic effect on that structure, resulting on fading away one of the two modes. We, succeeded in confining these two chirped modes into the structure by detuning the gratings. Finally, detuned grating effect will be explained.

Paper Details

Date Published: 18 April 2000
PDF: 11 pages
Proc. SPIE 3947, In-Plane Semiconductor Lasers IV, (18 April 2000); doi: 10.1117/12.382103
Show Author Affiliations
Magdy Hussein Mourad, Univ. des Sciences et Technologies de Lille (France)
Jean-Pierre Vilcot, Univ. des Sciences et Technologies de Lille (France)
Didier J. Decoster, Univ. des Sciences et Technologies de Lille (France)
Dominique D. Marcenac, British Telecom Labs. (United Kingdom)


Published in SPIE Proceedings Vol. 3947:
In-Plane Semiconductor Lasers IV
Luke J. Mawst; Ramon U. Martinelli, Editor(s)

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