Original scientific paper

https://doi.org/10.17559/TV-20241027002098

Effects of Fibre Bragg Gratings and Channel Number Variation on System Performance in Free Space Optical Communication Systems

Enes Koca ; Marmara University, Department of Electrical and Electronics Engineering, Recep Tayyip Erdoğan Complex - M4 Building Aydinevler Mah. Uyanık Cad. No. 6 34840 Maltepe/Istanbul, Turkey *
Veysel Gökhan Böcekçi ; Marmara University, Department of Electrical and Electronics Engineering, Recep Tayyip Erdoğan Complex - M4 Building Aydinevler Mah. Uyanık Cad. No. 6 34840 Maltepe/Istanbul, Turkey
Pinar Özkan ; Marmara University, Department of Electrical and Electronics Engineering, Recep Tayyip Erdoğan Complex - M4 Building Aydinevler Mah. Uyanık Cad. No. 6 34840 Maltepe/Istanbul, Turkey

* Corresponding author.

Abstract

The FSO system uses free space to transmit high data rate data over long distances through light and has been developed as a technology that can be realised with high bandwidth and data rate as well as low BER. FSO systems have recently been preferred over fibre optic cabling and radio frequency communication, especially in urban data transmission, in emergency situations where fast network installation is required, and in rural or remote areas where fibre optic infrastructure is difficult to install. Q factor and BER values are among the main determinants in positioning FSO systems as a reliable, efficient and high performance communication solution. Reducing the BER and increasing the Q factor are of great importance for FSO systems to increase the communication quality and perform better in different environmental conditions. In this paper, we present a different approach to improve the communication quality by decreasing the BER and increasing the Q factor by integrating an FBG sensor, which is reported to have a significant effect on noise reduction in fibre optic communication systems, into the FSO link. In order to evaluate the system performance based on this approach, the communication link, which we designed as single-channel and 4-channel, was tested with and without FBG sensor using ASK, DPSK, QPSK, 4-QAM and 8-QAM modulations. According to the measurements, it has been determined that increasing the number of channels and the use of FBG reduces the BER value and improves the line quality by increasing the Q-factor value. Especially in the 4-QAM and 8-QAM modulation scenario, which is designed as a single channel, it is found that communication cannot be achieved without the integration of FBG sensors, while a quality communication can be achieved after the integration of FBG sensors into the system. In this study, it is shown that the use of FBG sensors in the FSO communication link improves the system performance under interference effects. In our study, the changes in line quality for the systems are presented in detail with eye diagrams, tables and graphs.

Keywords

ber; bit error rate; fibre bragg grating; free space optics; fso; Q-factor

Hrčak ID:

335051

URI

https://hrcak.srce.hr/335051

Publication date:

30.8.2025.

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