Title :
Silica-based waveguide-type wavelength-insensitive couplers (WINC´s) with series-tapered coupling structure
Author :
Takagi, Akihiro ; Jinguji, Kaname ; Kawachi, Masao
Author_Institution :
NTT Opto-electron. Lab., Ibaraki, Japan
fDate :
12/1/1992 12:00:00 AM
Abstract :
The authors propose new wavelength-insensitive directional couplers (WINCs) with series-tapered waveguides in the coupling region. The wavelength-insensitive characteristics are investigated with respect to the geometric symmetry of the series-tapered coupling structure. An approximate analysis of three types of WINC is made using simple transmission matrix multiplication. These new WINC´s were fabricated based on silica-based planar lightwave circuits (PLCs) on silicon substrates. The experimental results for the wavelength-insensitive responses of the series-tapered coupler, which was designed in detail with the beam propagation method (BPM), are in good agreement with the calculated results. The novel wavelength-insensitive characteristics of these couplers are also demonstrated for the first time
Keywords :
approximation theory; directional couplers; integrated optics; multiplexing equipment; optical couplers; optical waveguides; wavelength division multiplexing; Si substrates; approximate analysis; coupling region; directional couplers; geometric symmetry; multiplexing equipment; optical communications equipment; series-tapered coupling structure; series-tapered waveguides; silica-based planar lightwave circuits; transmission matrix multiplication; waveguide-type wavelength-insensitive couplers; Circuits; Directional couplers; Insertion loss; Optical devices; Optical fiber couplers; Optical filters; Optical interferometry; Optical modulation; Optical sensors; Optical waveguides;
Journal_Title :
Lightwave Technology, Journal of
