Porous Al2O3 Cladded Chopped and Nonchopped Al2O3 Thin Film Waveguides: Effect of Moisture and Leafy Vegetation

概要

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Chopped and nonchopped Al2O3 thin film optical waveguides with porous chopped and nonchopped Al2O3 claddings have been studied for effects due to moisture and leafy vegetation. The changes in the transmission of the cladded waveguide due to relative humidity have been reported in this paper. The changes are more significant when a non chopped waveguide is used. The hot-water-oxidized Al2O3 cladding decreases the output more than the steam-oxidized Al2O3 cladding. The effect of a leaf overlay on the cladded waveguide is also investigated. For the first time, overlay effects on cladded optical waveguides have been reported. The fresh leaves decrease the output significantly, the decrease being more than that when a cladded waveguide is directly exposed to ${\sim}90$% moisture. As the leaves dry, leaf-type-dependent changes are observed. Use of the overlay technique for cladded optical waveguides may provide a direct method for moisture content determination.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-11-15