Title
On-chip interrogator based on Fourier transform spectroscopy
Author
Peternella, F.G.
Esselink, T.
Dorsman, B.
Harmsma, P.J.
Horsten, R.C.
Zuidwijk, T.
Urbach, H.P.
Adam, A.L.C.
Publication year
2019
Abstract
In this paper, the design and the characterization of a novel interrogator based on integrated Fourier transform (FT) spectroscopy is presented. To the best of our knowledge, this is the first integrated FT spectrometer used for the interrogation of photonic sensors. It consists of a planar spatial heterodyne spectrometer, which is implemented using an array of Mach-Zehnder interferometers (MZIs) with different optical path differences. Each MZI employs a 3_3 multi-mode interferometer, allowing the retrieval of the complex Fourier coefficients. We derive a system of non-linear equations whose solution, which is obtained numerically from Newton's method, gives the modulation of the sensor's resonances as a function of time. By taking one of the sensors as a reference, to which no external excitation is applied and its temperature is kept constant, about 92% of the thermal induced phase drift of the integrated MZIs has been compensated. The minimum modulation amplitude that is obtained experimentally is 400 fm, which is more than two orders of magnitude smaller than the FT spectrometer resolution.
Subject
High Tech Systems & Materials
Industrial Innovation
Fourier analysis
Fourier series
Interferometers
Modulation
Newton-Raphson method
External excitation
Fourier coefficients
Fourier transform spectroscopy
Modulation amplitudes
Multimode interferometer
Optical path difference
Orders of magnitude
Spatial heterodyne
Spectrometers
To reference this document use:
http://resolver.tudelft.nl/uuid:82031572-122d-493e-b19c-d271140f347c
TNO identifier
867431
Publisher
Optical Society of America OSA
ISSN
1094-4087
Source
Optics Express, 27 (11), 15456-15473
Document type
article