Title :
Large Dispersion of Silicon Directional Couplers Obtained via Wideband Microring Parametric Characterization
Author :
Aguinaldo, Ryan ; Shen, Yiran ; Mookherjea, Shayan
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California, San Diego, CA, USA
fDate :
7/15/2012 12:00:00 AM
Abstract :
Using the measured transmission spectrum of a waveguide-coupled silicon microring, we develop an algorithm for determining the wavelength dependencies (i.e., the dispersions) of the coupling coefficients and loss of the ring. Our analysis reconstructs the measured spectrum without use of Lorentzian fitting, covers 15 free spectral ranges (FSR), and was performed from ~ 1520 to 1570 nm, covering all of and extending past the C-band. We demonstrate that the dispersion of the coupling coefficient of a silicon-waveguide directional coupler considerably exceeds (by a factor of ~ 10) the modal refractive-index dispersions of its constituent waveguides.
Keywords :
elemental semiconductors; optical directional couplers; optical dispersion; optical waveguides; refractive index; silicon; Lorentzian fitting; Si; coupling coefficients; free spectral ranges; modal refractive-index dispersions; silicon directional couplers; silicon-waveguide directional coupler; transmission spectrum; waveguide-coupled silicon microring; wavelength dependencies; wideband microring parametric characterization; Couplers; Couplings; Dispersion; Indexes; Optical ring resonators; Optical waveguides; Silicon; Directional couplers; dispersion engineering; ring resonators; silicon photonics;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2198639