Experimental Demonstration of Full-Duplex Data Transmission Link using Twisted Lights Multiplexing over 1.1-km Orbital Angular Momentum (OAM) Fiber

We propose and demonstrate a full-duplex data transmission link using twisted light multiplexing over 1.1-km OAM fiber. The uplink and downlink transmit OAM+1, OAM-1 at x- polarization and y-polarization carrying 20 Gbit/s QPSK signal respectively. The measured full-duplex OSNR penalties at BER of 2x10(exp -3) for uplink and downlink are about 2.3 dB.