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 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$330-\text{GHz}$</tex> 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-phasenoise 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 frequencydivision multiplexing signals were transmitted over the system, achieving a line rate of up to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$100 \text{Gb} / \mathrm{s}$</tex> with basic digital signal processing. The high speed and simplicity of the proposed system highlight its potential for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$100-\text{Gb} / \mathrm{s}$</tex>-class applications in 6 G and beyond networks.