LAUSR

We present a novel PANDA-type elliptical-core multimode fiber featured by the combination of an elliptical core and two symmetrical circular stress-applying parts (SAPs). The characterization results indicate that such a special fiber design is able to support 24 fully separated eigenmodes with minimum effective index difference (min(Δneff)) between adjacent modes larger than 1.35×10-4 over the whole C band. Specifically, the fiber geometric dimensions and doping concentrations are deviation tolerant and reasonable within the existing fiber manufacture facility restriction, thus would be promising for practical fabrication. The fiber bending effects are also investigated based on conformal mapping. Moreover, ultra-broadband performance is analyzed over the whole C+L band ranging from 1530 nm to 1625 nm. The designed fiber is targeted at applications in direct fiber vector eigenmode-division multiplexing combined with the mature wavelength-division multiplexing technique while eliminating the complex multiple-input multiple-output digital signal processing.