Title :
Arrayed waveguide grating based on group-index modification
Author :
Matos, Óscar M. ; Calvo, María L. ; Cheben, Pavel ; Janz, Siegfried ; Rodrigo, José A. ; Xu, Dan-Xia ; Delâge, André
Author_Institution :
Dept. de Opt., Univ. Complutense de Madrid
fDate :
3/1/2006 12:00:00 AM
Abstract :
The authors propose a new wavelength-dispersive principle based on waveguide group-index modification and apply this principle in a new type of arrayed waveguide dispersive element based on modified group index. The element is composed by an array of waveguides consisting of two sections with different group indexes. We deduce the applicable dispersion formula and demonstrate that the group-index modification can be used for controlling or enhancing device wavelength dispersion. Two device examples are provided. First, dispersive properties of a waveguide array with silicon on insulator (SOI) straight waveguides with group index modified by waveguide widening are calculated. Then, the authors show that by placing the element with modified group index in a phased array of a conventional arrayed waveguide grating (AWG) device, the dispersive properties of the AWG are markedly enhanced. Dispersion-enhancement factor of up to 60 is calculated for a compact demultiplexer designed for SOI platform with group index modified by photonic-bandgap effect
Keywords :
arrayed waveguide gratings; demultiplexing equipment; optical communication equipment; optical dispersion; optical fibre communication; photonic band gap; refractive index; silicon-on-insulator; wavelength division multiplexing; arrayed waveguide grating; demultiplexer; dispersion-enhancement factor; modified group index; photonic-bandgap effect; silicon on insulator straight waveguides; wavelength-dispersive principle; Arrayed waveguide gratings; Councils; Dispersion; Optical waveguides; Phased arrays; Planar waveguides; Refractive index; Silicon on insulator technology; WDM networks; Wavelength division multiplexing; Arrayed waveguide gratings (AWGs), silicon on insulator (SOI) technology; waveguide arrays; wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.863303
