Title :
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
fDate :
4/1/1992 12:00:00 AM
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;
Journal_Title :
Quantum Electronics, IEEE Journal of
