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Improvements on phase-shifted distributed-coupling-coefficient distributed feedback laser structures for single longitudinal mode operation

Boavida, J.M. ; Fernandes, C. F. ; Morgado, J.

Progress in Electromagnetics Research Vol. 6, Nº 1, pp. 91 - 95, January, 2010.

ISSN (print): 1559-8985
ISSN (online): 1559-8985

Journal Impact Factor: 4,735 (in 2008)

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Abstract
An optimized DFB laser structure is analyzed using an improved version of the Transfer-Matrix-Method. The proposed laser is specially useful in directly-modulated optical communication systems, since it presents extremely high selectivity and extremely low flatness at threshold regime, which results in an emitted spectrum above threshold that is very coherent and stable, with a side mode suppression ratio higher than 49 dB for a wide range of biasing current.