グレーデッド・インデクス型光導波路における画像伝送および空間フィルタリング

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  • Image transmission and spatial filtering characteristics in a thin-film graded-index optical
  • グレーデッド インデクスガタ ヒカリ ドウハロ ニ オケル ガゾウ デンソウ オヨビ クウカン フィルタリング

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The main purpose of the present studies is to analyze the transmission characteristics using graded index waveguides without image distortion. For the studies on transmission characteristics, we considered a model with Ti-diffused LiNbO3 waveguides. Through theoretical calculations in the space domain, we derived the point spread function (PSF) when a spatial impulse is used as input. For the electric field distribution inside the waveguide, we assumed Hermite-Gaussian functions and derived the first order perturbation solution, and performed the theoretical calculations. We evaluated the propagation characteristics of an optimized GRIN type optical waveguide with respect to propagation distance. The periodic focusing points in the propagation direction are confirmed. In order to remove the noise component during the transmission, we consider spatial filters. The image transmission and processing using spatial filters will be discussed.

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