A two-step double ion-exchange process is employed to produce dual-core waveguides in glass. First, potassium ion exchange is carried out at 400°C. Then, silver ion exchange is performed at 300°C. The fabricated waveguides have low losses, large single-mode regions, and more symmetrical profiles than single ion-exchanged waveguides. Etched gratings are also made in dual-core waveguides. Very high efficiencies are demonstrated in these waveguides.

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Funder Natural Sciences and Engineering Research Council of Canada
Persistent URL dx.doi.org/10.1063/1.104837
Journal Applied Physics Letters
Li, M.J. (M. J.), Honkanen, S. (S.), Wang, W.J. (W. J.), Leonelli, R. (R.), Albert, J, & Najafi, S.I. (S. I.). (1991). Potassium and silver ion-exchanged dual-core glass waveguides with gratings. Applied Physics Letters, 58(23), 2607–2609. doi:10.1063/1.104837