Title :
Wavelength dispersion of effective refractive indices of Rb:KTiOPO4 optical waveguides
Author :
Shi, L.P. ; Pun, E.Y.B. ; Chung, P.S.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong
fDate :
7/1/1996 12:00:00 AM
Abstract :
Multimode planar optical waveguides in z-cut KTiOPO/sub 4/ (KTP) substrates have been fabricated using Rb/sup +/:K/sup +/ ion-exchange process. Variations in the refractive index profile and the surface index change with wavelength in these waveguides are approximated by a simple relation. The dispersion characteristics of the effective refractive indices for different guided modes before and after annealing are calculated based on this approximation and the WKB method. Furthermore, the wavelength dispersion can also be expressed using a sellmeier-like equation, and there is an excellent agreement between the calculated values and the measured data.
Keywords :
WKB calculations; annealing; ion exchange; optical dispersion; optical planar waveguides; optical waveguide theory; potassium compounds; refractive index; rubidium; titanium compounds; KTP:Rb; KTiOPO4:Rb; Rb/sup +/:K/sup +/ ion-exchange; WKB method; annealing; guided modes; multimode planar Rb:KTiOPO/sub 4/ optical waveguide; refractive index profile; sellmeier-like equation; surface index; wavelength dispersion; z-cut KTP substrate; Dispersion; Optical planar waveguides; Optical refraction; Optical surface waves; Optical variables control; Optical waveguides; Planar waveguides; Refractive index; Surface waves; Waveguide transitions;
Journal_Title :
Photonics Technology Letters, IEEE
