Scalable Orbital Angular Momentum Mode-Division-Multiplexed Transmission over 10-km Graded-Index Ring-Core Fiber

We demonstrate a scalable MDM scheme using modular 4×4 MIMO with only 15 taps, transmitting 8 high-order OAM modes each carrying 10 wavelengths over 10-km graded-index ringcore fiber, delivering 3.2-Tbit/s aggregated capacity and 6.4 bit/s/Hz spectral efficiency.