There has been an increasing interest in the application of terahertz (THz) waves to broadband wireless communications. In particular, use of frequencies above 275 GHz is one of the strong concerns among radio scientists and engineers, because these frequency bands have not yet been allocated at specific active services, and there is a possibility to employ extremely large bandwidths for ultra-broadband wireless communications. Introduction of photonics technologies for signal generation, modulation and detection is effective not only to enhance the bandwidth and/or the data rate, but also to combine fiber-optic (wired) and wireless networks. This paper reviews recent progress in THz wireless communications using telecom-based photonics technologies towards 100 Gbit/s.

A coherent terahertz (THz) link at 200 GHz , with a variable data rate up to 11 Gbit/s, featuring a very high sensitivity at the receiver, is investigated. The system uses a quasi-optic unitravelling carrier photodiode (UTC-PD) emitter and an electronic receiver. The coherent link relies on an optical frequency comb generator at the emission to produce an optical beat note with 200 GHz separation, phase-locked with the receiver. Bit error ratio testing has been carried out using an indoor link configuration, and error-free operation is obtained up to 10 Gbit/s with a received power <2 µW.

Abstract:In this paper, we present a photonics-based approach to generating a highly stable coherent terahertz (THz) wave for application to wireless transmission. We introduce a novel system to stabilize the phases of optical carrier signals at different frequencies extracted from an optical frequency comb. By performing an error-free (bit error rate is less than 10 À11 ) transmission at 12.5 Gbit/s based on amplitude-shift keying modulation and heterodyne detection schemes with a carrier frequency of 100 GHz, we were able to verify the importance of phase stabilization.

No abstract

No abstract

No abstract

No abstract

No abstract