Abstract
Free space optical communication fsoc is vulnerable with fluctuating atmospheric. This paper focus analyzes the finding of new technique dual diffuser modulation (ddm) to mitigate the atmospheric turbulence effect. The performance of fsoc under the presence of atmospheric turbulence will cause the laser beam keens to (a) beam wander, (b) beam spreading and (c) scintillation. The most deteriorate the fsoc is scintillation where it affected the wavefront cause to fluctuating signal and ultimately receiver can turn into saturate or loss signal. Ddm approach enhances the detecting bit ‘1’ and bit ‘0’ and improves the power received to combat with turbulence effect. The performance focus on signal-to-noise (snr) and bit error rate (ber) where the numerical result shows that the ddm technique able to improves the range where estimated approximately 40% improvement under weak turbulence and 80% under strong turbulence.
Highlights
IntroductionFree space optical communication is an attractive alternative over fiber optical communication where provides high bandwidth, fast-installation and high security [1]
Free space optical communication is an attractive alternative over fiber optical communication where provides high bandwidth, fast-installation and high security [1]. FSOC is suffering with the atmospheric turbulence which can lead the laser beam (a) beam wanders, (b) beam spreading and (c) scintillation
This equation predicts a fluctuation in intensity and phase of receiving signal due to turbulence is weak and assuming that the refractive index structure coefficient CCn2n is symmetrical along the beam path, Rytov suggested a variance for the logirradiance given as [6]: σσll2ll IIII = 〈(llll II − 〈llll II〉)2〉 = 1.23CCn2n kk7/6LL11/6 (4)
Summary
Free space optical communication is an attractive alternative over fiber optical communication where provides high bandwidth, fast-installation and high security [1]. FSOC is suffering with the atmospheric turbulence which can lead the laser beam (a) beam wanders, (b) beam spreading and (c) scintillation. The beam wanders is refer to the condition beam deflected randomly through the changing refractive index oddities. Beam spreading refers to conditions where the beam spread more than diffraction estimated predict. For scintillation it affected the phase front of the beam can vary and resulting fluctuation irradiance or well known as intensity signal.
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