Browsing by Subject "Silicon-on-insulator (SOI) technology"

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    Low-power thermooptical tuning of SOI resonator switch
    (IEEE, 2006) Kiyat, I.; Aydınlı, Atilla; Dagli, N.
    A wavelength selective optical switch is developed based on a high-Q racetrack resonator making use of the large thermooptic coefficient of silicon. The racetrack resonator was fabricated using a silicon-on-insulator (SOI) single-mode rib waveguide. The resonator shows a high Q factor of 38 000 with spectral sidelobes of 11 dB down and can be thermooptically scanned over its full free-spectral range applying only 57 mW of electrical power. A low power of 17 mW is enough to tune the device from resonance to off-resonance state. The device functions as a wavelength selective optical switch with a 3-dB cutoff frequency of 210 kHz.
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    ItemOpen Access
    Polarization characteristics of compact SOI rib waveguide racetrack resonators
    (IEEE, 2005) Kiyat, I.; Aydınlı, Atilla; Dagli, N.
    We report on the development of compact optical racetrack resonators on silicon-on-insulator (SOI) rib waveguides. We make use of large-cross-section waveguides instead of photonic wire waveguides. We fabricated resonators with bending radii down to 20 μm and characterized for both transverse-electric and transverse-magnetic polarizations. Different polarization characteristics were analyzed and related to the modal shape of the SOI waveguide. These compact resonators show large free spectral ranges (3.0 nm), high finesse (19), and Q-factor (28 000) values.