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Comparative investigation of methods to determine the group velocity dispersion of an endlessly single-mode photonic crystal fiber

: Baselt, Tobias; Popp, Tobias; Nelsen, Bryan; Lasagni, Andrés-Fabián; Hartmann, Peter


Kalli, K. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Micro-structured and Specialty Optical Fibres V : 26-27 April 2017, Prague, Czech Republic
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10232)
ISBN: 978-1-5106-0965-5
ISBN: 978-1-5106-0966-2
Paper 102320K, 7 S.
Conference "Micro-Structured and Specialty Optical Fibres" <5, 2017, Prague>
Bundesministerium für Bildung und Forschung BMBF
FHprofUnt; 03FH004PX3
Entwicklung und Evaluierung eines industrietauglichen Messplatzes zur Bestimmung der Dispersion in multimodalen Lichtwellenleitern
Fraunhofer IWS ()
endlessly single-mode fiber; photonic crystal fiber; group velocity dispersion during operation

Endlessly single-mode fibers, which enable single mode guidance over a wide spectral range, are indispensable in the field of fiber technology. A two-dimensional photonic crystal with a silica central core and a micrometer-spaced hexagonal array of air holes is an established method to achieve endless single-mode guidance. There are two possible ways to determine the dispersion: measurement and calculation. We calculate the group velocity dispersion GVD based on the measurement of the fiber structure parameters, the hole diameter and the pitch of a presumed homogeneous hexagonal array and compare the calculation with two methods to measure the wavelength-dependent time delay. We measure the time delay on a three hundred meter test fiber with a homemade supercontinuum light source, a set of bandpass filters and a fast detector and compare the results with a white light interferometric setup. To measure the dispersion of optical fibers with high accuracy, a time-frequency-domain setup based on a Mach-Zehnder interferometer is used. The experimental setup allows the determination of the wavelength dependent differential group delay of light travelling through a thirty centimeter piece of test fiber in the wavelength range from VIS to NIR. The determination of the GVD using different methods enables the evaluation of the individual methods for characterizing the endlessly single-mode fiber.