Distributed feedback lasers with alternating laterally coupled ridge-waveguide surface gratings

Distributed feedback lasers with laterally coupled ridge-waveguide surface gratings having the protrusions placed alternately on the lateral sides of the ridge are demonstrated. This configuration enables easier-to-fabricate wider trenches than in the gratings with protrusions placed symmetrically o...

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Bibliographic Details
Published in:Optics letters 2017-08, Vol.42 (16), p.3141-3144
Main Authors: Uusitalo, Topi, Virtanen, Heikki, Karjalainen, Maija, Ranta, Sanna, Viheriälä, Jukka, Dumitrescu, Mihail
Format: Article
Language:English
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Summary:Distributed feedback lasers with laterally coupled ridge-waveguide surface gratings having the protrusions placed alternately on the lateral sides of the ridge are demonstrated. This configuration enables easier-to-fabricate wider trenches than in the gratings with protrusions placed symmetrically on both sides of the ridge. The design strategy and coupling coefficient calculations are discussed. The output characteristics of fabricated lasers show lower threshold currents and higher slope efficiencies for devices with first-order alternating gratings than for those with third-order symmetric gratings having comparable grating trench widths and similar coupling coefficients.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.42.003141