A vertically coupled InGaAsP/InP directional coupler filter of ultranarrow bandwidth

Author

Wu, Chi ; Rolland, C. ; Puetz, N. ; Bruce, R. ; Chik, K.D. ; Xu, J.M.

Author_Institution

Dept. of Electr. Eng., Toronto Univ., Ont., Canada

Volume

3

Issue

6

fYear

1991

fDate

6/1/1991 12:00:00 AM

Firstpage

519

Lastpage

521

Abstract

A report is presented on the design, analysis, and experiment of an InGaAsP/InP ultranarrow-bandwidth wavelength filter. The device consists of two vertically coupled waveguides of dissimilar cross sections and different material parameters. Whereas the upper thin waveguide uses air cladding in the lateral direction, the lower thick waveguide is weakly confined laterally. The difference in the optical confinements of the two waveguides is designed to give rise to a rapid decrease in the coupling strength with the wavelength deviating from the central wavelength, thereby achieving a narrow bandwidth. The measured -3-dB bandwidth (full width at half maximum) is >

Keywords

III-V semiconductors; directional couplers; gallium arsenide; gallium compounds; indium compounds; optical communication equipment; optical couplers; optical filters; 1.2655 micron; III-V semiconductors; air cladding; analysis; central wavelength; coupling strength; design; dissimilar cross sections; lateral direction; lower thick waveguide; material parameters; optical confinements; ultranarrow-bandwidth wavelength filter; upper thin waveguide; vertically coupled InGaAsP-InP directional coupler filter; Bandwidth; Directional couplers; Indium phosphide; Optical coupling; Optical devices; Optical fiber communication; Optical filters; Optical receivers; Optical waveguides; Wavelength division multiplexing;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.91020

Filename

91020