AN ARROW OPTICAL WAVELENGTH FILTER - DESIGN AND ANALYSIS

A novel ARROW-based optical wavelength filter is proposed. The modal characteristics of the coupled ARROW structures is analyzed rigorously by the transverse resonance method. As an alternative configuration to the conventional directional coupler filter, the proposed device has the following attractive features: large core size compatible with fiber, nearly periodic dependence of the coupling-length on the waveguide separation which provides more flexibility for fabrication of the device. A design procedure for this type of coupled ARROW structures used for wavelength filtering is presented. The devices designed are simulated and verified by the beam propagation method. The ARROW wavelength filter based on SiO2/TiO2 has a FWHM bandwidth narrower than 7angstrom.