First Demonstration of Orbital Angular Momentum (OAM) Distributed Raman Amplifier over 18-km OAM Fiber with Data-Carrying OAM Multiplexing and Wavelength-Division Multiplexing

We propose and demonstrate orbital angular momentum (OAM) distributed Raman amplifier over 18-km OAM fiber with 2 OAM modes multiplexing and 16 wavelength-division multiplexing. The on-off gain of the two OAM modes are about 3 dB from 1530 nm to 1565 nm.