Publication: A novel wavelength dispersive device with a dispersive element based on staircase-like straight and parallel arrayed waveguides
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2007-02-01
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Elsevier Science BV
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Abstract
We propose a new type of arrayed waveguide grating (AWG) multiplexer/demultiplexer based on modified group refractive index. This device is composed by an array of straight and parallel waveguides of equal length and each waveguide consist of two sections with different width. The length of the two sections are changed from a waveguide to the adjacent one following a linear dependence resulting in a wavelength dispersive waveguide array. An example of the device design for silicon-on-insulator (Sol) platform is provided and numerical simulations have been carried out for various arrayed waveguide parameters. We demonstrate that the group index modification can be used for tailoring device dispersion properties, and that it can also result in new dispersion characteristics predicted numerically not observed in conventional AWGs. Additional advantages are that the demultiplexer does not necessarily require bending waveguide sections as in a conventional AWG (de)multiplexers, and thus yields highly compact devices with potentially very low insertion loss. Channel spacing of I nm have been predicted for sub-micron waveguides sizes. In this paper it is also proposed a novel wavefront converter based on waveguide array lens-like element with waveguides broadened sections. Numerical results for different input/output geometries are analized.
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© 2006 Elsevier B.V.
The financial supports from the Spanish Ministry of Science and Technology under Project TIC2002-1846 and from the National Research Council of Canada are acknowledged. 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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