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Authors: A. Vasiliev, M. Muneeb, J. Allaert, R. Baets, G. Roelkens
Title: Integrated Silicon-on-Insulator AWG Spectrometer with Single Pixel Readout for 2.3 um Spectroscopy Applications
Format: International Conference Proceedings
Publication date: 5/2018
Journal/Conference/Book: European Conference on Integrated Optics (ECIO'2018)
Volume(Issue): p.44-46 (We.2.B.4-HRP)
Location: Valencia, Spain
Internal Reference: [N-2217]
Download: Download this Publication (290KB) (290KB)

Abstract

A compact and cheap mid-infrared spectrometer is realized by integrating a Silicon-on-Insulator (SOI)
Arrayed Waveguide Grating (AWG) spectrometer operating in the 2.3 μm wavelength range with a high performance photodiode. The AWG has twelve output channels with a spacing of 225 GHz (4 nm) and a free spectral range (FSR) of 3150 GHz (56 nm), which are simultaneously collected by a single, transistor outline (TO)-packaged extended InGaAs PIN photodiode. The response of each AWG channel is discerned by time-sequentially modulating the optical power in each output channel using integrated Mach-Zehnder based (MZI) thermo-optic modulators with a pi-phase shift power consumption of 50 mW. The photonic chip is interfaced using off-the-shelf electronic components and a standard 9/125 single-mode fiber. The response of the AWG is limited to one FSR using a 50 nm Full Width Half-Maximum (FWHM) bandpass interference filter. Using 31 μW optical power in the fiber, the absorption spectrum of a 0.5 mm thick polydimethylsiloxane sheet (PDMS) is sampled and compared to a benchtop spectrometer to good agreement.

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