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

Abstract

Radio-over-free-space (Ro-FSO) technology is a combination of free-space optics (FSO) and wireless communication systems. 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 x 2.5Gbps-5GHz data over 2.5 km free space link. The results are reported in terms of Bit error rate (BER), 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.

Enhanced performance analysis of a hybrid spectrum sliced‐wavelength division multiplexing‐mode division multiplexing‐orthogonal frequency division multiplexing based radio‐over‐free space optics

“…Also, it can be observed that increasing atmospheric attenuation from light fog to heavy fog has a degrading effect on the quality of the signal at the receiver. The maximum transmission range acceptable performance (SNR approximately 20 dB) is over 2000 m under light fog; 1800 m under medium fog; 1500 m under heavy fog.…”

“…Measured (A) signal-to-noise ratio (SNR), (B) received power vs transmission range for varying fog weather can be observed that increasing atmospheric attenuation from light fog to heavy fog has a degrading effect on the quality of the signal at the receiver. The maximum transmission range acceptable performance (SNR approximately 20 dB) [25][26][27] is over 2000 m under light fog; 1800 m under medium fog; 1500 m under heavy fog. Further, we propose an improved Ro-FSO link performance under dynamic weather conditions using an enhanced detection technique.…”

“…The authors in Refs. report the performance analysis of MDM based Ro‐FSO link under the impact of different environmental conditions and beam divergence. In this paper, we propose modeling and simulative investigation of hybrid spectrum‐sliced wavelength division multiplexing‐mode division multiplexing (SS‐WDM‐MDM) based OFDM‐Ro‐FSO transmission link.…”

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

“…In [46], the authors designed a mode selective coupler based on dual core PCF for mode conversion between LP 01 and LP 11 modes. In [29,47], solid core PCFs are designed as mode converters for excitation of LG modes. Recently [48], authors fabricated polarization beam splitters based on dual core PCF with magnetic fluids in air holes, which allows the proportion of polarization modes to be adjusted by controlling the magnetic field strength.…”

Performance Investigation of a High Data Rate Mode Division Multiplexed-Free Space Optics Link Under Harsh Weather Conditions

“…RoFSO technology provides unlicensed spectrum operation, interference, and interception-free transmission within a short deployment period and little expense [1]. To enhance the spectral efficiency and information-carrying capacity of RoFSO links, the mode division multiplexing (MDM) technique is incorporated in which independent RF signals are transmitted over distinct spatial modes of a single frequency laser beam [2][3][4][5][6]. Recently, Satea et al proposed that FSO systems employing multiple channels with erbium-doped fiber amplifiers (EDFAs) work efficiently under high attenuation environments such as heavy fog and dust [7].…”