Title :
All-optical tunable filters built with discontinuity-assisted ring resonators
Author :
Schwelb, Otto ; Frigyes, István
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
fDate :
3/1/2001 12:00:00 AM
Abstract :
Numerically simulated performance is presented in a new type of bandstop and bandpass filters, built with discontinuity-assisted ring resonator (DARR)-loaded couplers. The operating characteristic of the bandpass filter is similar to that of a long grating with a centered cavity or a photonic crystal with a defect. The filters are tuned by varying the refractive index or the length of the waveguide forming the ring or the cavity. Selectivity and tuning range are controlled by the coupling coefficient of the couplers, by the order of resonance in the rings, and by the reflection coefficient of the discontinuities. A design procedure and the effect of loss are also presented
Keywords :
band-pass filters; band-stop filters; optical couplers; optical losses; optical resonators; optical tuning; optical waveguide filters; all-optical tunable filters; bandpass filter; bandpass filters; bandstop filters; centered cavity; coupling coefficient; design procedure; discontinuities; discontinuity-assisted ring resonator loaded couplers; discontinuity-assisted ring resonators; long grating; operating characteristic; photonic crystal; reflection coefficient; refractive index; tuning range; Band pass filters; Couplers; Gratings; Numerical simulation; Optical ring resonators; Photonic crystals; Refractive index; Resonance; Resonator filters; Tuning;
Journal_Title :
Lightwave Technology, Journal of
