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Phase sensitive low-coherence interferometry using microwave photonics
Juan Clement, Haroldo Maestre, Germán Torregrosa y Carlos R. Fernández-Pousa
Optics Express (2020)
Ed. OSA Publishing ISSN:1094-4087 DOI:https://doi.org/10.1364/OE.403176 BIBTEX:@article{Clement:20,
author = {Juan Clement and Haroldo Maestre and Germ\'{a}n Torregrosa and Carlos R. Fern\'{a}ndez-Pousa},
journal = {Opt. Express},
keywords = {Absolute distance measurement; Fourier transform spectroscopy; Low coherence interferometry; Modulation techniques; Signal processing; Temporal resolution},
number = {21},
pages = {30432--30446},
publisher = {OSA},
title = {Phase sensitive low-coherence interferometry using microwave photonics},
volume = {28},
month = {Oct},
year = {2020},
url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-28-21-30432},
doi = {10.1364/OE.403176},
abstract = {We report on a low-coherence interferometer based on Microwave Photonics (MWP) which allows, for the first time to the best of our knowledge, stable determination of the interferogram\&\#x2019;s phase. The interferometer is built on suppressed carrier, double-sideband modulation, dispersive propagation in a chirped fiber Bragg grating, demodulation by electro-optical frequency down-conversion, and suitable signal processing techniques to account for modulation impairments. Taking as a reference a direct normalization of the link\&\#x2019;s microwave response, the system retrieves high-resolution interferograms, both in amplitude and phase and free from distortion induced by higher-order dispersion, in an optical path difference of 16.3 mm, surpassing previously reported values based on MWP implementations. We present representative applications targeted to the characterization of C-band sources and components, such as direct analysis of interferograms with 5.5 fs temporal resolution, Fourier-transform spectroscopy with 14 GHz spectral resolution, and optical low-coherence reflectrometry of the impulse response\&\#x2019;s amplitude of fiber Bragg gratings with 0.55 \&\#x03BC;m spatial resolution.},
}
- Vol. 28, no. 21, pp. 30432-30446
Resumen:
We report on a low-coherence interferometer based on Microwave Photonics (MWP) which allows, for the first time to the best of our knowledge, stable determination of the interferogram’s phase. The interferometer is built on suppressed carrier, double-sideband modulation, dispersive propagation in a chirped fiber Bragg grating, demodulation by electro-optical frequency down-conversion, and suitable signal processing techniques to account for modulation impairments. Taking as a reference a direct normalization of the link’s microwave response, the system retrieves high-resolution interferograms, both in amplitude and phase and free from distortion induced by higher-order dispersion, in an optical path difference of 16.3 mm, surpassing previously reported values based on MWP implementations. We present representative applications targeted to the characterization of C-band sources and components, such as direct analysis of interferograms with 5.5 fs temporal resolution, Fourier-transform spectroscopy with 14 GHz spectral resolution, and optical low-coherence reflectrometry of the impulse response’s amplitude of fiber Bragg gratings with 0.55 μm spatial resolution.
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