100-Gbps Fiber-Terahertz System in 330-GHz Band Using Stable Transmitter and Simple Photonics-Enabled Receiver

We demonstrate a fiber–terahertz system in the 330-GHz band using a stable transmitter and a simple photonics-enabled receiver. At the transmitter, an optical frequency comb and an optical intensity modulator are used for stable terahertz signal generation. At the receiver, a low phase noise photonic local oscillator signal is generated using a newly fabricated high-extinction-ratio Mach-Zehnder modulator for signal down-conversion. As the proof-of-concept demonstration, 16-/32-quadrature amplitude modulation orthogonal frequency-division multiplexing signals were transmitted over the system and a line rate of up to 100 Gb/s was achieved using a basic digital signal processing. The high speed and simplicity of the proposed system reveal the potential for 100-Gb/s-class applications in 6G networks.