Integrated optical cross strip polarizer concept

Manfred Lohmeyer, Remco Stoffer

    Research output: Contribution to journalArticleAcademicpeer-review

    23 Citations (Scopus)


    Passing across an abrupt junction from a thick vertically bimodal waveguide to a thinner single mode segment, guided light can undergo complete destructive interference, provided that the geometry and the phases of the modes in the initial segment are properly adjusted. We propose to employ this effect to realize a simple polarizer configuration, using a strip that is etched from a planar waveguide. A beam of light is made to pass the strip perpendicularly. The light enters from the single mode waveguide outside the strip into the strip segment, which is configured to support two modes. At the end of the strip, apart from reflections, the amount of power that is guided in the following lower segment depends on the local phases of the two modes. These phases are different for TE and TM light, hence we may expect a polarization dependent power transfer, resulting in polarizer performance for a properly selected geometry. The paper describes in detail the modeling of the device in terms of rigorous mode expansion. Design guidelines and tolerance requirements for geometric and material parameters are discussed. For typical Si3N4/SiO2 materials, our calculations predict a peak performance of 34 dB polarization discrimination and 0.3 dB insertion loss for a device with a total length of about 12
    Original languageUndefined
    Article number10.1023/A:1010894801196
    Pages (from-to)413-431
    Number of pages19
    JournalOptical and quantum electronics
    Issue number4-5
    Publication statusPublished - Apr 2001


    • Integrated Optics
    • EWI-13971
    • IR-62516
    • METIS-200488
    • optical interferometer
    • optical polarizer
    • Numerical modeling

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