The loss and spectral characteristics of fused tapered coupiers depend, respectively, on the taper transition rate and on the size, shape, and length of the coupler waist region. We show how the choice of the fusing and tapering burner is critical in optimizing the behavior of three different coupler types: the single-wavelength splitter, the wavelength division multiplexer, and the wavelength-independent coupler.
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Kenneth P. Oakley (1994) studied this question.
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