Novel vertical directional couplers, consisting of graded-index planar waveguides, were realised by field-assisted K+-ion exchange in glass. Normal mode measurements of the coupling length are compared to results based on numerical simulations of the diffusion equation and the beam propagation method.
Electronics Letters
Department of Electronics

Albert, J, Noutsis, P.C., & Yip, G.L. (Gar Lam). (1992). Novel vertical directional coupler made by field-assisted ion-exchanged slab waveguides in glass. Electronics Letters. doi:10.1049/el:19920851