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Proceedings Paper

Arrayed waveguide gratings beyond communication: utilization of entire image-plane of output star-coupler for spectroscopy and sensing
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Paper Abstract

A conventional Arrayed Waveguide Grating (AWG) has been tailored for non-conventional applications such as Astro-Photonics, Life-science and spectroscopy where the input signal can have information over the full continuum of light/spectrum, compared to discrete optical channels in optical communication systems. The material system chosen for the AWG design is silicon-nitride/SiO2/Si (Si3N4-SiO2-Si) for it's relatively high refractive index, which for a given channel spacing allowing a more compact device than Silicon-on-Silica. While existing conventional AWGs cannot be utilized in spectroscopy when the input is a continuum, due to the fixed output waveguides where the centre wavelength λc and therefore rest of the wavelength channels have been assigned to predetermined output waveguides, the device under development has no output waveguides permitting to utilize the entire-image plane of the output star-coupler. The output of the AWG can then be re-imaged onto a detector array to sample the entire output spectrum, such as the 2-D infrared arrays used in astronomy. The designed AWG can resolve up to 40 spectral channels with wavelength spacing 0.4nm (50GHz), adjacent channel cross-talk level < -25dB at the ITU grid (25GHz) and non-uniformity ~ 2.5dB. The modeled mean spectral resolving power, R, at the flat image-plane is ~ 12,200.

Paper Details

Date Published: 10 May 2012
PDF: 9 pages
Proc. SPIE 8431, Silicon Photonics and Photonic Integrated Circuits III, 84311U (10 May 2012); doi: 10.1117/12.923145
Show Author Affiliations
Harendra N. J. Fernando, Leibniz-Institut für Astrophysik Potsdam (Germany)
Andreas Stoll, Leibniz-Institut für Astrophysik Potsdam (Germany)
Jose C. Boggio, Leibniz-Institut für Astrophysik Potsdam (Germany)
Roger Haynes, Leibniz-Institut für Astrophysik Potsdam (Germany)
Martin M. Roth, Leibniz-Institut für Astrophysik Potsdam (Germany)

Published in SPIE Proceedings Vol. 8431:
Silicon Photonics and Photonic Integrated Circuits III
Laurent Vivien; Seppo K. Honkanen; Lorenzo Pavesi; Stefano Pelli, Editor(s)

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