Title :
Wavelength-Dependent Model of a Ring Resonator Sensor Excited by a Directional Coupler
Author :
Delage, André ; Xu, Dan-Xia ; McKinnon, Ross W. ; Post, Edith ; Waldron, Philip ; Lapointe, Jean ; Storey, Craig ; Densmore, Adam ; Janz, Siegfried ; Lamontagne, Boris ; Cheben, Pavel ; Schmid, Jens H.
Author_Institution :
Inst. of Microstruct. Sci. of the Nat. Res. Council Canada, Ottawa, ON
fDate :
5/1/2009 12:00:00 AM
Abstract :
The spectral characteristics of a ring resonator made of Si photonic wires are modeled using mode expansion of supermodes of the directional coupler. The influence of the coupling coefficient, loss factor and waveguide dispersion on the spectral features are analyzed in detail. The model is then compared with the experimental data of a ring resonator designed for sensing purposes. The model that includes a wavelength dependence on coupling length reproduces the large variations of the envelope of the experimental spectrum, when coupling coefficient cover its full range from 0 to 1. Fitting parameters explain the details of the experimental spectrum and contribute to the sensor optimization, as well as illustrating general guidelines for ring resonator design.
Keywords :
elemental semiconductors; optical design techniques; optical directional couplers; optical dispersion; optical losses; optical materials; optical resonators; optical sensors; optical waveguides; optimisation; silicon; Si; coupling coefficient; directional coupler; optical loss factor; optical sensor optimization; photonic wires; ring resonator sensor design; supermode expansion; waveguide dispersion; wavelength-dependent model; Directional couplers; Glass; Integrated optics; Optical ring resonators; Optical surface waves; Optical waveguides; Optoelectronic and photonic sensors; Resonance; Sensor phenomena and characterization; Wires; Guided wave; integrated optics devices; photonic integrated circuits; ring resonator; sensors;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2008.929427
