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Título:
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Bandpass filter implemented with blazed waveguide sidewall gratings in silicon-on-insulator
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Autores:
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Villafranca Velasco, Aitor ;
Bock, Przemek J. ;
Cheben, Pavel ;
Calvo Padilla, María Luisa ;
Schmid, Jens H. ;
Lapointe, Jean ;
Xu, Dan-Xia ;
Janz, Siegfried ;
Delâge, André
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Tipo de documento:
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texto impreso
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Editorial:
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The Institution of Engineering and Technology (IET), 2012-06-07
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Optica
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Tipo = Artículo
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Resumen:
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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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En línea:
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https://eprints.ucm.es/id/eprint/25364/1/CalvoML06.pdf
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