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Effects of structural parameters on the external optical feedback sensitivity in DFB semiconductor lasers

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3 Author(s)
Alam, M.F. ; Center for Electro-Opt., Dayton Univ., OH, USA ; Karim, M.A. ; Islam, S.

External optical feedback sensitivity in distributed feedback (DFB) semiconductor lasers is analyzed with special attention to phase-shifted and complex-coupled lasers. The effects of various structural parameters such as coupling strength, facet reflectivity, and corrugation phase angle on external optical feedback sensitivity are studied. The λ/4 phase-shifted index-coupled DFB laser exhibits low external optical feedback sensitivity for large index-coupling coefficient and high facet reflectivity. Pure gain-coupled DFB lasers perform better than the phase-shiftless uniform index-coupled DFB lasers but worse than λ/4 phase-shifted index-coupled lasers with high coupling strengths. External optical feedback sensitivity of complex-coupled lasers depends significantly on the index-to-gain coupling ratio, the phase between the index and gain gratings, and the total coupling

Published in:

Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 3 )