Ultra-low-loss inverted taper coupler for silicon-on-insulator ridge waveguide

Minhao Pu, Liu Liu, Haiyan Ou, Kresten Yvind, Jørn Märcher Hvam

    Research output: Contribution to journalJournal articleResearchpeer-review


    An ultra-low-loss coupler for interfacing a silicon-on-insulator ridge waveguide and a single-mode fiber in both polarizations is presented. The inverted taper coupler, embedded in a polymer waveguide, is optimized for both the transverse-magnetic and transverse-electric modes through tapering the width of the silicon-on-insulator waveguide from 450 nm down to less than 15 nm applying a thermal oxidation process. Two inverted taper couplers are integrated with a 3-mm long silicon-on-insulator ridge waveguide in the fabricated sample. The measured coupling losses of the inverted taper coupler for transverse-magnetic and transverse-electric modes are ~0.36 dB and ~0.66 dB per connection, respectively.
    Original languageEnglish
    JournalOptics Communications
    Issue number19
    Pages (from-to)3678-3682
    Publication statusPublished - 2010


    • integrated optics devices
    • optical design
    • fabrication waveguide


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