As we have experienced in the development of 120-GHz band system, introduction of photonics
technologies for signal generation, modulation and detection is very effective not only to enhance
the bandwidth and/or the data rate, but also to fuse wireless networks into fiber-optic (wired)
systems. In addition, photonics-based approach is expected to bring such ultra-high data rate
wireless technologies to potential users and to meet and explore real-world applications at the
earliest opportunity as a technology driver [8]. For this purpose, demonstration of Breal-time[
wireless transmission is required without use of an Boff-line[ digital signal processing [10], [11]. In
this paper, we present a recent progress in real-time error-free wireless transmission technologies
using THz waves towards 100 Gb/s and more.