Design and fabrication of broad-band silica-based optical waveguide couplers with asymmetric structure

Author

Takagi, Akihiro ; Jinguji, Kaname ; Kawachi, Masao

Author_Institution

NTT Opto-Electron. Lab., Ibaraki, Japan

Volume

28

Issue

4

fYear

1992

fDate

4/1/1992 12:00:00 AM

Firstpage

848

Lastpage

855

Abstract

Waveguide-type directional couplers with different guide widths in the interactive region are designed and fabricated with silica-based waveguides on silicon substrates. It is demonstrated that these asymmetric couplers have broadband coupling-ratios of, for example, 50%±5%, 25%±3%, or 5%±2% over a wide wavelength range from 1.3 to 1.55 μm, which are in good agreement with the results calculated using the beam propagation method (BPM). The excess loss of these couplers is as low as 0.7 dB, including input and output single-mode fiber coupling losses

Keywords

directional couplers; optical couplers; optical losses; silicon compounds; 0.7 dB; 1.3 to 1.55 micron; Si substrates; asymmetric couplers; asymmetric structure; beam propagation method; broad band SiO₂ based optical waveguide couplers; broadband coupling-ratios; design; excess loss; fabrication; guide widths; interactive region; output single-mode fiber coupling losses; waveguide type directional couplers; wide wavelength range; Directional couplers; Optical coupling; Optical design; Optical device fabrication; Optical fiber couplers; Optical fiber polarization; Optical waveguides; Silicon; Structural beams; Waveguide theory;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.135202

Filename

135202