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Bandpass filter implemented with blazed waveguide sidewall gratings in silicon-on-insulator

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Villafranca Velasco, Aitor and Bock, Przemek J. and Cheben, Pavel and Calvo Padilla, María Luisa and Schmid, Jens H. and Lapointe, Jean and Xu, Dan-Xia and Janz, Siegfried and Delâge, André (2012) Bandpass filter implemented with blazed waveguide sidewall gratings in silicon-on-insulator. Electronics Letters, 48 (12). pp. 715-717. ISSN 0013-5194

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Official URL: http://dx.doi.org/10.1049/el.2012.0591


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Abstract

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.


Item Type:Article
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© The Institution of Engineering and Technology 2012.
Financial support from the Spanish Ministry of Science and Innovation is acknowledged under grant TEC2008-04105.

Uncontrolled Keywords:Engineering, Electrical, Electronic
Subjects:Sciences > Physics > Optics
ID Code:25364
Deposited On:14 May 2014 07:58
Last Modified:14 May 2014 07:58

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