Coherent photonic 70 GHz band mixer module with WR-12 output

In this work, we present a novel compact rectangular-waveguide-type (WR-12) coherent photonic mixer module, featuring a balanced photodetector. The module enables the direct fiber-to-the-antenna connectivity for the upcoming 5G links. Experimental results with respect to the output RF power (e.g., -7.3 dBm at 73 GHz) and the frequency response deviation (±0.5 dB) are presented within the 71-76 GHz range.