Effective Method for Determining Chromatic Dispersion From a Spectral Interferogram

We present a novel method for determining chromatic dispersion profile from a broadband spectral interferogram obtained by using a white-light interferometry technique. The proposed method is based on direct calculations of a second derivative of the registered spectral intensity at extremal points,...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-02, Vol.37 (3), p.1056-1062
Main Authors: Zolnacz, Kinga, Olszewski, Jacek, Martynkien, Tadeusz, Urbanczyk, Waclaw
Format: Article
Language:English
Subjects:
Bandwidths
Broadband
Chromatic dispersion
Dispersion
Fiber optic communications
Glass plates
Interference
Microsoft Windows
Optical fiber dispersion
Optical fibers
optical interferometry
Optical variables measurement
Phase shift
Spectra
White light
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Summary:We present a novel method for determining chromatic dispersion profile from a broadband spectral interferogram obtained by using a white-light interferometry technique. The proposed method is based on direct calculations of a second derivative of the registered spectral intensity at extremal points, which in result gives a spectral phase difference derivative further used for dispersion determining. Although the method is best suited for processing interferograms with modulation around a zero level (zero-mean value interferograms) and slowly changing envelope, the conducted numerical tests show that it is highly tolerable to different types of perturbations of the input interference signal. The proposed method can be applied both to spectral interferograms with monotonically changing phase difference as well as containing stationary phase difference points. We demonstrate the effectiveness and accuracy of the proposed method in measurements of chromatic dispersion of commercially available samples like the BK7 glass plate and the Corning SMF-28 optical fiber.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2018.2885980