Asymmetric excitation of symmetric single-mode Y-junctions: the radiation mode effects

Author

Khalil, Diaa A M ; Benech, Pierre ; Tedjini, Smail

Author_Institution

LEMO, Grenoble, France

Volume

40

Issue

12

fYear

1992

fDate

12/1/1992 12:00:00 AM

Firstpage

2235

Lastpage

2242

Abstract

The asymmetric excitation of a symmetric single-mode Y-junction is studied using two techniques: the standard BPM and a modal analysis based on the radiation spectrum. The authors found that the power splitting between the two outputs of the junction is strongly dependent on the coherent coupling of the odd radiation modes excited at the input of the junction. A GaAs-GaAlAs single-mode junction excited by a single-mode fiber is experimentally tested and a splitting ratio as high as 12 dB is obtained. Such a result, which could not be explained if the radiation field is neglected, proposes new applications of the Y-junction like an optical displacement sensor with a high sensitivity on the order to 5 dB/μm

Keywords

integrated optics; optical losses; optical waveguide components; optical waveguide theory; GaAs-GaAlAs; asymmetric excitation; modal analysis; odd radiation modes; optical displacement sensor; power splitting; radiation mode effects; radiation spectrum; single-mode Y-junctions; single-mode fiber; standard BPM; symmetric junctions; Gallium arsenide; Modal analysis; Optical fiber sensors; Optical fiber testing; Optical fibers; Optical filters; Optical sensors; Optical waveguides; Performance analysis; Waveguide junctions;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.179885

Filename

179885