Integrated photonic 71–76 GHz transmitter module employing high linearity double mushroom-type 1.55 μm waveguide photodiodes

Here, we present novel high-power partially p-doped, partly non-intentionally doped absorbing double mushroom-type 1.55 μm waveguide photodiodes for integration in compact photonic transmitter modules employed in E-band (60-90 GHz) radio-over-fiber systems. Besides the high-output power levels approaching 0 dBm and a high linearity in the 70 GHz band, the developed photodiodes also exhibit an excellent frequency flatness and a return loss of ±0.5 dB and ~24 dB, respectively. For low-cost packaging, the photodiodes are hybrid integrated with 71-76 GHz high-electron-mobility-transistor amplifiers followed by a low-loss radio frequency laminate-based grounded-coplanar-waveguide-to-WR-12 transition in order to enable broadband wireless communications over longer medium-range distances.