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Related Experiment Videos

Laser-written polarizing directional coupler with reduced interaction length.

I V Dyakonov, M Yu Saygin, I V Kondratyev

    Optics Letters
    |October 14, 2017
    PubMed
    Summary
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    We developed a novel stress-induced anisotropy method to significantly shrink polarizing integrated optical devices. This technique reduces the footprint of polarizing directional couplers by nearly an order of magnitude, enabling more compact photonic chips.

    Area of Science:

    • Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • Femtosecond laser writing (FSLW) is used for integrated optical waveguides.
    • Low anisotropy of FSLW waveguides leads to large footprints for polarizing devices.

    Purpose of the Study:

    • To demonstrate a method for reducing the size of polarizing integrated devices.
    • To achieve miniaturization of polarizing directional couplers using stress-induced anisotropy.

    Main Methods:

    • Fabrication of integrated optical waveguides using femtosecond laser writing.
    • Induction of anisotropy through applied stress.
    • Characterization of polarizing directional couplers at 808 nm wavelength.

    Main Results:

    Related Experiment Videos

    • Reduced footprint of polarizing directional couplers to 3.7 mm.
    • Achieved extinction ratios of 16 dB for horizontal and 20 dB for vertical polarizations.
    • Demonstrated significant size reduction compared to previous methods.

    Conclusions:

    • Stress-induced anisotropy is an effective method for miniaturizing polarizing integrated optical devices.
    • The developed approach enables compact and efficient polarizing directional couplers.
    • A theoretical model for the observed effects is proposed.