600-GHz-Band Waveguide-Output Uni-Traveling-Carrier Photodiodes and Their Applications to Wireless Communication

Uni-traveling-carrier photodiodes (UTC-PDs) are packaged with WR-1.5 rectangular metallic waveguides to ensure 600-GHz band operation. A broadband coupler circuit between the UTC-PD and the hollow waveguide is monolithically integrated with the UTC-PD chip. The fabricated module exhibits the 3-dB bandwidth of 340 GHz, which is the widest among ever-reported photodiode modules. This module is successfully applied to 600-GHz band wireless communications with a data rate of over 10 Gbit/s.