Approximate calculation of leaky-mode loss coefficients for Ti-diffused LiNbO3waveguides

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 LiNbO3waveguides. Field representations correspond to the approximation of geometrical optics. Hybrid-mode effective indexes are approximated utilizing the known anisotropy of LiNbO3. For $X$ - or $Y$ -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