Title :
Wavelength characteristics of (2×2) optical channel-type directional couplers with symmetric or nonsymmetric coupling structures
Author :
Takagi, Akihiro ; Jinguji, Kaname ; Kawachi, Masao
Author_Institution :
NTT Opto-electron. Lab., Ibaraki, Japan
fDate :
6/1/1992 12:00:00 AM
Abstract :
The wavelength dependence of waveguide-type directional couplers is investigated with respect to waveguide pattern symmetry in the coupling region. A rough approximation of the dependence is determined based on simplified transfer matrix multiplications, followed by a more detailed computer calculation using the beam propagation method (BPM). Wavelength-flattened coupling characteristics over a wide range, for example, from 1.33-1.55 μm, are predicted for several types of directional coupler with waveguide width asymmetry or a tapered width structure in the coupling region
Keywords :
approximation theory; directional couplers; optical couplers; optical waveguide theory; 1.33 to 1.55 micron; IR wavelength-flattened coupling characteristics; beam propagation method; computer calculation; coupling region; integrated optics; nonsymmetric coupling structures; optical channel-type directional couplers; symmetric coupling structures; tapered width structure; transfer matrix multiplications; waveguide pattern symmetry; waveguide width asymmetry; waveguide-type directional couplers; wavelength dependence; Coupling circuits; Directional couplers; Optical filters; Optical modulation; Optical refraction; Optical sensors; Optical variables control; Optical waveguides; Programmable control; Transmission line matrix methods;
Journal_Title :
Lightwave Technology, Journal of
