Dispersion trimming for mid-infrared supercontinuum generation in a hybrid chalcogenide/silicon-germanium waveguide

Milan Sinobad, Alberto Della Torre*, Barry Luther-Davis, Pan Ma, Stephen Madden, Sukanta Debbarma, Khu Vu, David J. Moss, Arnan Mitchell, Jean Michel Hartmann, Jean Marc Fedeli, Christelle Monat, Christian Grillet

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    35 Citations (Scopus)

    Abstract

    We report a simple post-process technique that harnesses a hybrid chalcogenide/silicon-germanium system for the control of waveguide dispersion. By adding a chalcogenide top cladding to a SiGe/Si waveguide, we can substantially change the dispersive properties, which underpin the generation of a supercontinuum. In our particular example, we experimentally show that a shift from anomalous to normal dispersion takes place. We numerically study the dispersion dependence on the chalcogenide thickness and show how to use this additional degree of freedom to control the position of the zero dispersion wavelengths and hence the spectral span of the supercontinuum. Finally, we compare our approach with more traditional techniques that use geometry for dispersion tailoring.

    Original languageEnglish
    Pages (from-to)A98-A104
    JournalJournal of the Optical Society of America B: Optical Physics
    Volume36
    Issue number2
    DOIs
    Publication statusPublished - Feb 2019

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