Subwavelength grating Fourier-transform interferometer array in silicon-on-insulator



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Bock, Przemek J. and Cheben, Pavel and Villafranca Velasco, Aitor and Schmid, Jens H. and Delâge, André and Florjańczyk, Mirosław and Lapointe, Jean and Xu, Dan-Xia and Vachon, Martin and Janz, Siegfried and Calvo Padilla, María Luisa (2013) Subwavelength grating Fourier-transform interferometer array in silicon-on-insulator. Laser and Photonics Reviews, 7 (6). L67-L70. ISSN 1863-8880

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A planar waveguide Fourier-transform spectrometer with densely arrayed Mach-Zehnder interferometers is demonstrated. Subwavelength gratings are used to produce an optical path difference without waveguide bends. The fabricated device comprises of an array of 32 Mach-Zehnder interferometers, which produce a spatial interferogram without any moving parts, yielding a spectral resolution of 50 pm and a free-spectral range of 0.78 nm. As a result of similar propagation losses in subwavelength grating waveguides and conventional strip waveguides, loss imbalance is minimized and high interferometic extinction ratio of -25 to -30 dB is obtained. Furthermore, phase and amplitude errors arising from normal fabrication variation are compensated by the spectral retrieval process using calibration measurements.

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© 2013 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
This research was conducted at the National Research Council Canada. Coauthor A. V. V. acknowledges the financial support from the Spanish Ministry of Economy under grant EC2011-23629.

Uncontrolled Keywords:Planar Wave-Guide, Spatial Heterodyne Spectrometer, Resolution
Subjects:Sciences > Physics > Optics
ID Code:25313
Deposited On:09 May 2014 11:50
Last Modified:09 May 2014 11:50

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