Wavelength division multiplexing of free space optical system under the effect of oil fire smoke

In this paper, two wavelength division multiplexing (WDM) based free space optical (FSO) systems (single, multiple) are proposed and their performance is compared on the basis of Q-factor, eye opening diagrams and the total power of the received signal for different link distances under effect of oil fire smoke. The obtained results illustrate that the values of WDM single FSO of (1 km) distance exhibit good performance based on (Q-factor ≥ 6), but it was out of line performance at (2 km) FSO distance. The values of (1 km) distance exhibit good performance. On the other hand, the results of the FSO distance (2 km) indicate poor performance without signal loss. The presented results show that the eye opening for all the power values of (1 km) distance for both systems. Moreover, the eye opened only at the highest power value of (2 km) distance for single FSO systems. The eye opened partially at the lowest power of (2 km) distance and became fully opened at the mid-point and highest power values for multiple FSO systems. Thus, the proposed MIMO-FSO systems with multiplexes multiple optical carriers WDM demonstrates better results than SISO-FSO systems with WDM and the well knowing systems under similar atmospheric conditions.