Abstract
Recently, remarkable efforts have been made in developing wireless communication systems at ultrahigh data rates, with radio frequency (RF) carriers in the millimeter wave (30–300 GHz) and/or in the terahertz (THz, >300 GHz) bands. Converged technologies combining both the electronics and the photonics show great potential to provide feasible solutions with superior performance compared to conventional RF technologies. However, technical challenges remain to be overcome in order to support high data rates with considerably feasible wireless distances for practical applications, particularly in the THz region. In this work, we present an experimental demonstration of a single-channel THz radio-over-fiber (RoF) system operating at 350 GHz, achieving beyond 100 Gbit/s data rate over a 10-km fiber plus a >20-m wireless link, without using any THz amplifiers. This achievement is enabled by using an orthogonal frequency division multiplexing signal with a probabilistic-shaped 16-ary quadrature amplitude modulation format, a pair of highly directive Cassegrain antennas, and advanced digital signal processing techniques. This work pushes the THz RoF technology one step closer to ultrahigh-speed indoor wireless applications and serves as an essential segment of the converged fiber-wireless access networks in the beyond 5G era.
Highlights
With the rapid development of the Internet industry and the increasing number of wireless end users, the traffic demand for wireless service has been increasing dramatically
We present an experimental demonstration of a single-channel THz radio-over-fiber (RoF) system operating at 350 GHz, achieving beyond 100 Gbit/s data rate over a 10-km fiber plus a >20-m wireless link, without using any THz amplifiers
The frequency domain symbols after the linear equalization (LE) are re-modulated to the time domain, and before generating a time domain symbol x, the phase noise and the frequency offset induced by two optical ECLs are mitigated by the spectrum estimation and phase noise compensation (PNC).17
Summary
With the rapid development of the Internet industry and the increasing number of wireless end users, the traffic demand for wireless service has been increasing dramatically. By using a THz frequency window with a relatively lower atmospheric attenuation, the loss of terahertz signal during propagation is reduced, which in turn increases the transmission distance—for example, 100 Gbit/s 2 m wireless transmission at 350 GHz16 and 131 Gbit/s 10.7 m wireless transmission at 408 GHz.17 Another method is to use the probabilistic shaping (PS) technique on transmitted signals. In Ref. 20 for instance, a 50 Gbit/s wireless transmission at 300 GHz over 100 m was achieved by using a pair of high-gain antennas of 54 dBi. a wireless communication system with 100 Gbit/s quadrature phase shift keying (QPSK) signals over 110 m in the 300GHz band has been realized by using a THz power amplifier and a THz low noise amplifier.. It is noted that the line rate is calculated after removing the pilot and cyclic prefix (CP) overhead
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