concentric dual-core fibers, which couple light from an inner core to an outer core through a taper. Fibers with a 6 μm
MFD feedthrough and a 15 μm polarization maintaining feedthrough are demonstrated experimentally. Simulations
of the MFD in the tapered dual-core fibers are also presented.
This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-23-4524. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.