Experimental characterization of coupled waveguides by normal-mode excitation

Author

Scarlat, Dan ; Ruschin, Shlomo ; Brooks, David

Author_Institution

Dept. of Electr. Eng. Phys. Electron., Tel Aviv Univ., Israel

Volume

32

Issue

7

fYear

1996

fDate

7/1/1996 12:00:00 AM

Firstpage

1132

Lastpage

1140

Abstract

We present a novel method for measuring the coupling coefficient of a symmetric directional coupler, based on the direct excitation of the normal modes of the entire structure. The output-power distribution at different coupling lengths was related to the experimentally measured normal modes in order to find the coupling coefficient. The device was alternatively characterized by means of the individual-waveguide modes according to coupled-mode theory in the strong-coupling regime. Both methods were implemented on single-mode directional couplers in Ti:LiNbO ₃. The validity and accuracy of both approaches are discussed

Keywords

coupled mode analysis; integrated optics; lithium compounds; optical couplers; optical directional couplers; optical materials; optical waveguide theory; titanium; LiNbO₃:Ti; coupled waveguides; coupled-mode theory; coupling coefficient measurement; coupling lengths; direct excitation; entire structure; individual-waveguide modes; normal-mode excitation; output-power distribution; single-mode optical directional couplers; strong-coupling regime; symmetric directional coupler; Directional couplers; Integrated optics; Length measurement; Optical modulation; Optical switches; Optical waveguides; Partial differential equations; Power distribution; Power dividers; Waveguide theory;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.517012

Filename

517012