%0 Journal Article
%A Villafranca Velasco, Aitor
%A Bock, Przemek J.
%A Cheben, Pavel
%A Calvo Padilla, María Luisa
%A Schmid, Jens H.
%A Lapointe, Jean
%A Xu, Dan-Xia
%A Janz, Siegfried
%A Delâge, André
%T Bandpass filter implemented with blazed waveguide sidewall gratings in silicon-on-insulator
%D 2012
%@ 0013-5194
%U https://hdl.handle.net/20.500.14352/44170
%X The fabrication and experimental characterisation of a two-stage bandpass filter based on curved waveguide sidewall gratings is reported for the silicon-on-insulator platform. At each cascaded filtering stage, the spectral components of the input signal are dispersed by the diffraction grating formed in the sidewall of a silicon strip waveguide. Different wavelengths are focused onto different positions along the Rowland circle and the filter central wavelength is selected by a specific receiver waveguide. By using two consecutive filtering stages, both the filter passband profile and the stopband rejection ratio are substantially increased. The grating is apodised and chirped to ensure a constant effective index along the grating length to minimise phase distortions. Blazed geometry is used to maximise the diffraction efficiency to the - 1st order. The device was fabricated with electron beam lithography and reactive ion etching using a single etch step. A bandwidth of 6.2 nm was measured near 1590 nm for the fabricated filter, with a roll-off of 4 dB/nm at the passband edge, and a stopband rejection of 40 dB.
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