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

We demonstrate a fiber-terahertz system operating in the 330-GHz band, utilizing a stable transmitter and a simple photonics-enabled receiver. At the transmitter, an optical frequency comb and an optical intensity modulator are employed 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 downconversion. As a proof-of-concept demonstration, 16-/32-quadrature amplitude modulation orthogonal frequency-division multiplexing signals were transmitted over the system, achieving a line rate of up to 100 Gb/s with basic digital signal processing. The high speed and simplicity of the proposed system highlight its potential for 100-Gb/s-class applications in 6G and beyond networks.