Abstract
We report on a simple spectral interferometric technique for chromatic dispersion measurement of a short length optical fibre including the zero-dispersion wavelength. The method utilizes a supercontinuum source, a dispersion balanced Mach-Zehnder interferometer and a fibre under test of known length inserted in one of the interferometer arms and the other arm with adjustable path length. The method is based on resolving one spectral interferogram (spectral fringes) by a low-resolution NIR spectrometer. The fringe order versus the precise wavelength position of the interference extreme in the recorded spectral signal is fitted to the approximate function from which the chromatic dispersion is obtained. We verify the applicability of the method by measuring the chromatic dispersion of two polarization modes in a birefringent holey fibre. The measurement results are compared with those obtained by a broad spectral range (500–1600 nm) measurement method, and good agreement is confirmed.
Highlights
The chromatic dispersion, which is a significant characteristic of optical fibre, affects the bandwidth of a high speed optical transmission system through pulse broadening and nonlinear optical distortion
White-light interferometry based on the use of a broadband source in combination with a standard Michelson or a MachZehnder interferometer [3] is considered as one of the best tools for dispersion characterization of short length optical fibres
We verify the applicability of the method by measuring the chromatic dispersion of two polarization modes in a birefringent holey fibre
Summary
Listopadu 15, 708 33 Ostrava-Poruba, Czech Republic Department of Physics, Technical University Ostrava, 17. Listopadu 15, 708 33 Ostrava-Poruba, Czech Republic. We report on a simple spectral interferometric technique for chromatic dispersion measurement of a short length optical fibre including the zero-dispersion wavelength. The method utilizes a supercontinuum source, a dispersion balanced Mach-Zehnder interferometer and a fibre under test of known length inserted in one of the interferometer arms and the other arm with adjustable path length. The fringe order versus the precise wavelength position of the interference extreme in the recorded spectral signal is fitted to the approximate function from which the chromatic dispersion is obtained. We verify the applicability of the method by measuring the chromatic dispersion of two polarization modes in a birefringent holey fibre.
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