DocumentCode :
1075404
Title :
Approximate calculation of leaky-mode loss coefficients for Ti-diffused LiNbO3 waveguides
Author :
Burns, William K. ; Sheem, Sang K. ; Milton, A. Fenner
Author_Institution :
Naval Research Lab., Washington, DC, USA
Volume :
15
Issue :
11
fYear :
1979
fDate :
11/1/1979 12:00:00 AM
Firstpage :
1282
Lastpage :
1289
Abstract :
A hybrid-mode model is developed which allows analytical calculation of the leaky-mode loss coefficient in Ti-diffused LiNbO3 waveguides. Field representations correspond to the approximation of geometrical optics. Hybrid-mode effective indexes are approximated utilizing the known anisotropy of LiNbO3 . For 
- or 
-cut waveguides the leaky mode is shown to be an extraordinary-like hybrid mode with a small ordinary field component which arises from extraordinary to ordinary power conversion at the abrupt index boundary. This ordinary index component is not bound by the graded index boundary, giving rise to the power loss. The theoretical dependence of the loss coefficient on propagation direction is in agreement with experiment.
- or -cut waveguides the leaky mode is shown to be an extraordinary-like hybrid mode with a small ordinary field component which arises from extraordinary to ordinary power conversion at the abrupt index boundary. This ordinary index component is not bound by the graded index boundary, giving rise to the power loss. The theoretical dependence of the loss coefficient on propagation direction is in agreement with experiment.Keywords :
Lithium materials/devices; Optical planar waveguides; Planar optical waveguide; Anisotropic magnetoresistance; Geometrical optics; Optical films; Optical losses; Optical planar waveguides; Optical polarization; Optical propagation; Optical waveguides; Planar waveguides; Propagation losses;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.1979.1069927
Filename :
1069927
Link To Document :
