For the most precise measurement of DMD, we investigated a new type of method. It is capable of measuring the modal dispersion in two different ways. The first way is the standard transversal measurement, where the launching condition is altered by moving the radial position of the injected pulse while maintaining a zero-angle launching condition. The second way involves changing the launching angle into the fiber. This is done to get the most precise value for the DMD. Also, using a supercontinuum light source for the injection pulse, it is possible to vary the wavelength to be able to measure near the zero dispersion wavelength in order to investigate the effects of the chromatic dispersion.
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Marcus Wittig, Tobias Baselt, Bryan L. Nelsen, Peter Hartmann, "Unique method to determine the differential mode delay of specialty multimode fibers," Proc. SPIE 10232, Micro-structured and Specialty Optical Fibres V, 102320L (16 May 2017);