A design method to achieve wide wavelength-flattened responses in the directional coupler-type optical power splitters

Author

Kishioka, Kiyoshi

Author_Institution

Dept. of Lightwave Sci., Osaka Electro-Commun. Univ., Japan

Volume

19

Issue

11

fYear

2001

fDate

11/1/2001 12:00:00 AM

Firstpage

1705

Lastpage

1715

Abstract

A simple design method to achieve wide flattened bandwidths in the directional coupler-type light power splitters is presented, which is applicable both to the three- and two-guide couplers. Couplers with variable differences along the guide axis in the propagation constant between the waveguides are investigated, and the optimum profiles of the variation of the propagation-constant difference are designed for desired given wavelength responses. Designed examples for the three- and two-port splitting operations in the three-guide coupler and for two-port splitting operations in the two-guide coupler are demonstrated, in which the detuning of the propagation constant is assumed to be given by the electrooptic effect in the LiNbO₃ used as the substrate

Keywords

electro-optical effects; lithium compounds; optical beam splitters; optical design techniques; optical directional couplers; optical materials; optical planar waveguides; substrates; titanium; LiNbO₃; LiNbO₃:Ti; design method; detuning; directional coupler-type light power splitters; directional coupler-type optical power splitters; electrooptic effect; optimum profiles; propagation constant; propagation-constant difference; substrate; three-guide coupler; three-guide couplers; three-port splitting operations; two-guide coupler; two-guide couplers; two-port splitting; two-port splitting operations; variable differences; waveguides; wavelength responses; wide flattened bandwidths; wide wavelength-flattened responses; Bandwidth; Couplers; Design methodology; Equations; Mach-Zehnder interferometers; Optical coupling; Optical interferometry; Optical propagation; Optical waveguides; Propagation constant;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.964071

Filename

964071