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We present broadband group velocity dispersion (GVD) measurements ofcommercially available ultra-high numerical aperture fibers (UHNA1, UHNA3,UHNA4, UHNA7 and PM2000D from Coherent-Nufern). Although these fibers areattractive for dispersion management in ultrafast fiber laser systems in the 2{\mu}m wavelength region, experimental dispersion data in literature is scarceand inconsistent. Here we demonstrate the measurements using the spectralinterferometry technique covering the typically used erbium, thulium andholmium emission bands. The results are characterized in terms of thestandard-deviation uncertainty and compared with previous literature reports.Fitting parameters are provided for each fiber allowing for the straightforwardreplication of the measured dispersion profiles. This work is intended tofacilitate the design of ultrafast fiber laser sources and the investigationsof nonlinear optical phenomena.

Dispersion Measurement of Ultra-High Numerical Aperture Fibers covering Thulium, Holmium, and Erbium Emission Wavelengths