Abstract
There is a need for mode transforming devices connecting dielectric waveguides with different field distributions (especially with different core materials). Taking the coupling of a glass fiber to a semiconductor passive waveguide as an example, taper geometries are investigated which have low loss, short length, and are compatible with present semiconductor fabrication technologies (precise material homogenity and thickness control, etch-stop layers, "dynamic etch mask" technology1).
© 1991 Optical Society of America
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