Arrayed waveguide grating based on group-index modification

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Cheben, Pavel
Janz, Siegfried
Rodrigo Martín-Romo, José Augusto
Xu, Dan-Xia
Delâge, André
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IEEE - Inst. Electrical Electronics Engineers Inc.
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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.
© 2006 IEEE. Iberoamerican Meeting on Optics (RIAO)/ Latin American Meeting on Optics, Lasers, and Their Applications (OPTILAS) (5ª / 8ª. 2004. Porlamar, Venezuela). This work was supported by the Spanish Ministry of Science and Technology under project TIC2002-1846 and the National Research Council of Canada. Preliminary partial results were presented at the V Ibero-American Optics Meeting (RIAO) and VIII OPTILAS, October 2–8, 2004, Porlamar, Venezuela.
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Óptica (Física)
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2209.19 Óptica Física
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