Publication: Subwavelength grating Fourier-transform interferometer array in silicon-on-insulator
No Thumbnail Available
Official URL
Full text at PDC
Publication Date
2013-11
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley-V C H Verlag GMBH
Citations
Exportar
Abstract
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.
Description
© 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.