Polarization-diversified, multichannel orbital angular momentum (OAM) coherent communication link demonstration using 2D—3D hybrid integrated devices for free-space OAM multiplexing and demultiplexing

We present dual-polarization QPSK link transmission performance below the FEC limit with simultaneous transmission of three OAM states carrying 14×10-GBd WDM channels using silica 2D-3D hybrid integrated devices for OAM state multiplexing/demultiplexing capacity of 1.68 Tb/s.