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

Topi Uusitalo, Heikki Virtanen, Maija Karjalainen, Sanna Ranta, Jukka Viheriälä, Mihail Dumitrescu

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)


    Distributed feedback lasers with laterally coupled ridgewaveguide
    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
    Original languageEnglish
    Pages (from-to)3141-3144
    Number of pages4
    JournalOptics Letters
    Issue number16
    Publication statusPublished - 15 Aug 2017
    Publication typeA1 Journal article-refereed

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