Analog radio of fiber link of 2-Gbaud OOK/BPSK radio frequency-orbital angular momentum beam transmission over 19.4 km

Abstract

The 5G mobile communication system provides ultrareliable, low-latency communications at up to 10 Gbps. However, the scale and power consumption of 5G is tremendous owing to a large number of antenna drivers required by the massive multiple-input multiple-output technique. The 6G system will require an architectural paradigm shift to resolve this problem. In this study, we propose an analog RoF downlink scheme for 6G wireless communications. The upcoming oversized base station problem is solved using photonics techniques. The antennas are driven together within the optical domain at a centralized station. The proposed system uses orbital angular momentum (OAM) beams as the generated space-division-multiplexing beams. An RF-OAM beam has a weak coupling effect between different modes, which will dramatically decrease the complexity of the signal processing. In our proof-of-concept experiment, the generated RF-OAM beam was shown to carry a 2-Gbaud OOK/BPSK signal in the Ku-band. Signals were transmitted over a 19.4-km RoF link without dispersion-induced power fading. In addition, by switching the OAM beams, a two-dimensional direction scanning was achieved.

Photonic Radio Frequency Orbital Angular Momentum Generation and Beam Steering

“…2) Analog Ratio of Fiber Link of 2-Gbaud OOK/BPSK With an RF-OAM Signal: The combination of space-divisionmultiplexing and RF-OAM beams was demonstrated in 6G wireless communications in 2021 [31]. The experiment is a great achievement that shows the significant potential of RF-OAM in next generation communications.…”

Design and performance analysis of OAM‐based multidimensional multiplexing RoF‐PON integrated access system

“…20 Recently, a study has simplified the architecture of RoF base station through photonics techniques, realizing 19.4 km transmission of radio frequence (RF) OAM beams. 21 Not much has been given to OAM-based fiber-wireless converged systems, despite extensive experimental analysis of OAM-based fiber and RF links, respectively. In this scenario, a commendable objective would be to integrate OAM-DM with other multiplexing techniques and apply them to RoF-PON, aiming to achieve higher capacity and lower cost hybrid access network architecture.…”

“…Amphawan et al introduced PDM at the transmitter to reduce the number of light sources, achieving low‐cost and low‐complexity Ro‐OAM‐FSO link 20 . Recently, a study has simplified the architecture of RoF base station through photonics techniques, realizing 19.4 km transmission of radio frequence (RF) OAM beams 21 . Not much has been given to OAM‐based fiber‐wireless converged systems, despite extensive experimental analysis of OAM‐based fiber and RF links, respectively.…”