Delivery of 12QAM Single Carrier Signal in a MIMO Radio-Over-Fiber System at 60 GHz

As we know, the gap between 8-QAM and 16-QAM can be filled smoothly by introducing 12-QAM. In this paper, we experimentally demonstrated a reliable 10 Gbaud-rate transmission of polarization multiplexed 12-QAM single carrier signal in a MIMO radio-over-fiber system with 20-km SMF-28 wire link and 2.5-m wireless link at 60 GHz. The BER performance of 12-QAM signals at different baud rate and input power was also evaluated. Moreover, 12-QAM was also experimentally compared with 8-QAM and 16-QAM, and it can be concluded that 12-QAM brings a better compromise between effectiveness and reliability performance than 8-QAM and 16-QAM.