Abstract

We apply a three-dimensional beam-propagation algorithm to a half-coupler constituted by a single-mode fiber interacting through its evanescent field with a semi-infinite medium of index n_l. We calculate the fiber transmission losses as a function of various parameters such as the remaining fiber cladding thickness, the index value n_l, and the interaction length. A constant fiber bend is also introduced. Finally, we plot the map of the field, pointing out the existence of guided or leaky modes depending on the values of the parameters.

© 1987 Optical Society of America

Evanescent-field coupling between a monomode fiber and a high-index medium of limited thickness

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