Investigating the Probability Density Function of the Detected Intensity of Overlapping Laser Sources in an FSO Turbulent Environment

Issam, Eithar; Alhassan, Ahmed M.; Rashidi, C. B. M.; Aljunid, S. A.

doi:10.1109/iccceee46830.2019.9071313

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2023

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“…However, these sources perform weakly in the FSO environment; thus, the preferred light source is the coherent source [11]. Sources of coherent nature have been suggested for use in SAC OCDMA systems, and they have been shown to perform well under specific conditions [11,[16][17][18].…”

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confidence: 99%

Performance Analysis of Coherent Source SAC OCDMA in Free Space Optical Communication Systems

et al. 2023

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In this paper, we investigate the performance of spectral amplitude coding optical code division multiple access (SAC OCDMA) systems under the effect of beat noise and turbulence. Three different multi-laser source configurations are considered in this analysis: shared multi-laser, separate multi-laser, and carefully controlled center frequency separate multi-laser. We demonstrate through Monte Carlo simulation that the gamma–gamma probability density function (pdf) cannot adequately approximate the measured intensity of overlapping lasers and that an empirical pdf is required. Results also show it is possible to achieve error-free transmission at a symmetrical data rate of 10 Gbps for all active users when only beat noise is taken into account by precisely controlling the center frequencies. However, only 30% of the active users can be supported when both beat noise and turbulence are considered.

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