Eur. Phys. J. Appl. Phys.
Volume 46, Number 3, June 2009
|Number of page(s)||9|
|Published online||22 April 2009|
Optimisation of an asymmetric three phase-shift distributed feedback semiconductor laser
Structure concerning the above-threshold stability
Optical Communications Group, Instituto de Telecomunicações, Av. Rovisco Pais, 1049–001 Lisboa, Portugal
2 Portuguese Air Force Academy, Grânja do Marquês, 2715-021 Sintra, Portugal
Corresponding author: email@example.com
Revised: 11 February 2009
Accepted: 5 March 2009
Published online: 22 April 2009
This paper shows that accurately optimised asymmetric three phase-shift (3PS)-distributed feedback (DFB) laser structures can strongly improve the stability of the single-longitudinal mode (SLM) operation, described by the mode selectivity and the flatness of the photon density profile, through an extended range of current injection, when compared to optimised symmetric 3PS-DFB structures reported elsewhere. This study reveals its importance in modern high bit-rate optical communication systems, by enhancing the possibility of attaining high performance DFB lasers, in easily fabricated structures. The procedure, based on matrix techniques, aims at the description of the optimal design of the laser structure and it is described step-by-step. Above-threshold calculations have been accomplished to evaluate the performance of the optimised asymmetric 3PS-DFB structure, namely: the mode selectivity (), the flatness, the lasing wavelength, the optical power, and the side-mode suppression ratio (SMSR) evolutions with the current injection. For a current injection five times bigger than the threshold current, substantially improvements in (five times bigger) and in the SMSR (about 9 dB higher) are achieved when compared to similar, but symmetric, DFB structures.
PACS: 42.55.Px – Semiconductor lasers; laser diodes / 85.60.-q – Optoelectronic devices / 42.82.-m – Integrated optics / 75.40.Mg – Numerical simulation studies
© EDP Sciences, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.