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An effective method for coupling optical signals from single-mode fibers to thin-film waveguides is proposed. The authors show that this method provides high coupling efficiency for connecting fibers of different core diameters to thin-film waveguides of different film thicknesses or refractive indexes. The authors summarize the theoretical treatment of the coupler. Examples of couplers designed for SiO/sub 2/-based materials as well as iron garnets are presented. Fabrication of the proposed coupler and its experimental results are described.>
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Cai et al. (1991) studied this question.
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