Quasi-hermetic photodiode module featuring a WR12 output for 71–76 GHz Radio-over-Fibre applications

An E-Band quasi-hermetic photodiode module featuring a WR12 rectangular waveguide output has been developed using an RF transition implemented on ROGERS 5880 laminate. Its simulated maximum group delay deviation of less than 1 ps makes it suitable as wireless transmitter for Radio-over-Fibre (RoF) applications. The manufactured prototype exhibits a flat frequency response with a maximum variation <;1 dB within the band of interest (71-76 GHz). The maximum measured output power is -12.5 dBm, while the 1-dB compression point is at 9 mA, with -13.5 dBm of corresponding RF power. Error-free 1 Gb/s RoF transmission (BER<;10^-9) has been demonstrated, with only 1.2 dB of measured power penalty over the 71-76 GHz band.