A fiber mode matching device between dissimilar optical waveguides is proposed and fabricated. The device has a refractive index profile that varies in the direction of propagation without changing the normalized frequency. We fabricated a single-mode tapered fiber with a rectangular core at one end and a circular core at the other. The modal field transformer is expected to allow highly efficient coupling between dissimilar waveguide devices.
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Shigihara et al. (1986) studied this question.
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