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In this paper, an envelope detection scheme of single carrier 16ary quadrature amplitude modulation (16QAM) for Intensity-Modulation/ Direct-Detection (IM/DD) radio-over-fiber (RoF) system is theoretically and experimentally investigated. Based on the proposed scheme, the mm-wave 16QAM signal is down-converted to the intermediate frequency (IF) 16QAM one by an envelope detector (ED) and there is no use of a mixer at the user side. We theoretically and experimentally study the performance of the signal under various conditions. In the system, 2GBaud 16QAM signal is delivered over 25 km standard single mode fiber (SSMF) link and 2.9m wireless link under bit error rate (BER) of 3.8 × 10−3.

Envelope detection of 16QAM single carrier signal for IM/DD RoF system at Q-band