Radio-over-free space optical space division multiplexing system using 3-core photonic crystal fiber mode group multiplexers

Wireless Networks - Radio over free space optics (Ro-FSO) systems have previously relied on the signal intensity, wavelength and polarization for multiplexing data streams in...     

Solid core PCF-based mode selector for MDM-Ro-FSO transmission systems

Radio-over-free-space (Ro-FSO) technology is a combination of free-space optics (FSO) and radio over fiber. It plays a significant role in radio-frequency signal transmission in mobile network communication through high-speed optical carrier without any licensing and costly cables. Photonic crystal fibers also play a significant role to deliver data at faster rate for short haul communication. This paper, for the first time to the author’s best knowledge, utilizes mode division multiplexing in conjunction with solid core PCFs to transmit \(2 \times 2.5\) Gbps–5 GHz data over 2.5 km free-space link. The results are reported in terms of bit error rate, spatial profiles of received modes, mode spectrum of modes and eye diagrams. Furthermore, proposed PCF-MDM-Ro-FSO transmission system is also reported under the impact of atmospheric turbulences.     

High-speed MDM-Ro-FSO system by incorporating spiral-phased Hermite Gaussian modes

In the wake of growing challenges of dispersing communication services in rural areas, Radio over Free Space (Ro-FSO) is a useful technology that can carry heterogeneous services. This work focuses on transmitting two independent channels, each carrying 2.5 Gbps data and 10 GHz radio signal, by utilizing mode-division multiplexing (MDM) of two spiral-phased Hermite Gaussian modes (HG00 and HG01) free space optical (FSO) link. It also evaluates the performance of the proposed Ro-FSO system under the impact of beam divergence and various atmospheric turbulences such as moderate fog and heavy fog.