Fig. 5: Experimental results are used to prove that the metasurface-based CVB mode multiplexer/demultiplexer is compatible with polarization multiplexing.
From: Cylindrical vector beam multiplexer/demultiplexer using off-axis polarization control
a Measured mode crosstalk of four CVB mode channels. b BERs corresponding to eight CVB mode channels at 1554 nm. c Constellations of the QPSK signals of CVB modes (m = ±1, ±2) with x-pol and y-pol, respectively
