Abstract

We investigate the performance of free-space discrete multi-tone (DMT) modulation and direct detection system. 1-to-72 multicasting (8 wavelengths × 9 OAM modes) of 17.875 Gb/s DMT QPSK signal is demonstrated and the BER of all 72-fold channels are below 2.4×10−2.

© 2015 Optical Society of America

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