Much work has been reported on the study of integrated optical waveguides fabricated by ion exchange in glass.1 Multimode couplers have become commercially available.2 However, research on buried single-mode waveguides made by the two-step ion-exchange process has only recently been reported.3 The versatility of this technique makes feasible the volume production of complicated structures such as large 1 × n couplers which are Inherently achromatic.

© 1989 Optical Society of America

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