Demonstration of add/drop multiplexer for 100-Gbit/s RZ-QPSK channels over spatially multiplexed orbital angular momentum modes


We experimentally demonstrate the add/drop multiplexer for two orbital angular momentum (OAM) modes carrying 100-Gbit/s RZ-QPSK channels. An OSNR penalty of <;1.6 dB for added and dropped channels is observed. 


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