Title :
Phase-dithered waveguide grating with flat passband and sharp transitions
Author_Institution :
MetroPhotonics Inc., Ottawa, Ont., Canada
Abstract :
A new passband flattening technique for waveguide grating devices is proposed and experimentally demonstrated. It uses phase dithering of grating elements to obtain a flat passband with sharp transitions while maintaining single-mode input and output waveguides. The chromatic dispersion characteristics of the device can be improved simultaneously over the passband. The theory and design method based on an iterative Fourier transform algorithm are presented in detail with simulation and experimental results. The technique can be used in both arrayed waveguide grating and echelle grating-based devices.
Keywords :
Fourier transform optics; arrayed waveguide gratings; diffraction gratings; integrated optics; optical design techniques; optical dispersion; optical waveguide components; arrayed waveguide grating devices; chromatic dispersion characteristics; design method; echelle grating-based devices; flat passband; iterative Fourier transform algorithm; passband flattening technique; phase dithering; phase-dithered waveguide grating; sharp transitions; single-mode input waveguides; single-mode output waveguides; Arrayed waveguide gratings; Chromatic dispersion; Crosstalk; Design methodology; Fourier transforms; Helium; Optical waveguide theory; Optical waveguides; Passband; Waveguide transitions;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2002.805969
