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Photonic bandgap fiber bundle spectrometer

Qu, Hang et Ung, Bora et Skorobogatiy, Maksim. 2012. « Photonic bandgap fiber bundle spectrometer ». In 2012 Conference on Lasers and Electro-Optics, CLEO 2012 (San Jose, CA, USA, May 6-11, 2012) Washington, DC, USA : IEEE Computer Society.


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We experimentally demonstrate an all-fiber spectrometer consisting of a photonic bandgap fiber bundle and a black and white CCD camera. Photonic crystal fibers used in this work are the large solid core all-plastic Bragg fibers designed for operation in the visible spectral range and featuring bandgaps of 60nm - 180nm-wide. 100 Bragg fibers were chosen to have complimentary and partially overlapping bandgaps covering a 400nm-840nm spectral range. The fiber bundle used in our work is equivalent in its function to a set of 100 optical filters densely packed in the area of ~1cm2. Black and white CCD camera is then used to capture spectrally "binned" image of the incoming light at the output facet of a fiber bundle. To reconstruct the test spectrum from a single CCD image we developed an algorithm based on pseudo-inversion of the spectrometer transmission matrix. We then study resolution limit of this spectroscopic system by testing its performance using spectrally narrow test peaks (FWHM 5nm-25nm) centered at various positions within the 450nm-700nm spectral interval. We find that the peak center wavelength can always be reconstructed within several percent of its true value regardless of the peak width or position. Moreover, we demonstrate that although the widths of the individual Bragg fiber bandgaps are quite large (>60nm) the spectroscopic system has a resolution limit of ~30nm. We conclude by showing theoretically, that, in principle, presented spectroscopic system can resolve much narrower peaks down to several nm in width; this would, however, require a stringent control of the experimental errors during measurement and calibration. We believe that photonic bandgap fiber bundle-based spectrometers have a potential to become an important technology in multispectral imaging because of their simplicity (lack of moving parts), instantaneous response, and high degree of integration.

Type de document: Compte rendu de conférence
Ung, Bora
Affiliation: Autres
Date de dépôt: 06 oct. 2014 16:23
Dernière modification: 24 févr. 2017 16:20

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