Performance evaluation of a 160-Gbit/s OCDMA- FSO system via Laguerre-Gaussian beams under weather conditions

For capacity enhancement of free space optics (FSO) communication, a new model based on using four Laguerre-Gaussian (LG) beams, each carries four different users use optical code division multiplexing (OCDMA) techniques, is proposed. Additionally, the permutation vec-tor (PV) codes that have zero cross correlation with direct detection (DD) technique are assigned to the OCDMA system. Each user carries 10 Gbps information data, so the overall capacity is 4 LG beams x 4 users (OCDMA) x 10 Gbps = 160 Gbps. Furthermore, the proposed model is simulated under the effects of different attenuations caused by different weather conditions and the perfor-mance is studied. The conducted results reveal successful transmission of 13 km under clear air (CA), 1.75 km under heavy haze (HH), 1.1 km under heavy rain (HR), and 0.9 km under heavy fog (HF) with an overall system capacity of 160 Gbps. These results were obtained with an accept-able log bit error rate (BER) less than -9 and quality (Q)-factor nearly 6.(c) 2022 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

Automated summary

A new model based on using four Laguerre-Gaussian (LG) beams with optical code division multiplexing (OCDMA) techniques is proposed for capacity enhancement in free space optics (FSO) communication. The model uses permutation vector (PV) codes with zero cross correlation and each user carries 10 Gbps information data, resulting in an overall capacity of 160 Gbps. The model is also simulated under different weather conditions and demonstrates successful transmission up to 13 km with acceptable bit error rate (BER) and quality (Q)-factor.