Optical-terahertz-optical seamless integration system for dual-λ 400 GbE real-time transmission at 290 GHz and 340 GHz
Zhang J, Lei M Z, Zhu M, et al
Sci China Inf Sci, 2023, 66(11): 214301
Terahertz band (THz-band, 0.3 to 10 THz) communications are envisioned as a promising candidate for 6G and beyond technology, which can provide data capacity tens or even hundreds of Gbps per physical layer link. Over the past several years, a series of THz communication systems at record-high data rates have undergone significant development, accelerated by electronic and hybrid electronicphotonic techniques. In particular, the seamless integration of THz wireless into commercial fiber-optic can complement the advantages of flexibility, high capacity, and wide-area coverage. By using THz wireless fiber extenders in accordance with monolithic microwave integrated circuits, the first real-time 100 Gbps optical-wireless-optical transmission system at 300 GHz was demonstrated over two fiber-optic links and 0.5–500 m wireless link, and the 34 GBaud polarization division multiplexing quadraturephase-shift-keying (PDM-QPSK) optical baseband signal was processed online via commercial digital coherent optics (DCO) modules. However, the nonlinear harmonics distortion and the limited modulation bandwidth of solidstate devices can ultimately limit the data capacity for high bandwidth-consuming applications.