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



Downloads per month over past year

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

[thumbnail of CalvoML06.pdf]

Official URL:


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
Additional Information:

© 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:31 Dec 2020 00:02

Origin of downloads

Repository Staff Only: item control page