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Spectral analysis and mitigation of beam wandering using optical spatial filtering technique in FSO communication

Spectral analysis and mitigation of beam wandering using optical spatial filtering technique in FSO communication

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In this chapter, the main contribution by proposing the OSF as the detection method in FSO is producing an optical method that capable to filtering noise and minimizing scintillation in real time where these advantages are accordance to the benefit of FSO as the low cost platform of telecommunication. The OSF-detection method capable to solve the weaknesses of DD method where spatial noise, beam wander and scintillation as the results of turbulence effects can be suppressed optimally before the signal detected by PD. The OSF detection method also can solve the major problem in optical amplification using Erbium-doped fiber amplifier (EDFA) where beam wandering can cause the loss signal that should be coupled into the stage of amplification process. Thus, implementing the OSF as a detection method in FSO brings significance for the improvement of performance.

Chapter Contents:

  • 6.1 Introduction
  • 6.2 Pinhole as the optical spatial filter
  • 6.3 Pinhole and cone reflector as the optical spatial filter
  • 6.4 Pinhole, cone reflector, and multi-mode fiber as the optical spatial filter
  • References

Inspec keywords: scintillation; optical signal detection; optical filters; signal denoising; erbium; spatial filters; atmospheric turbulence; optical fibre amplifiers; free-space optical communication; spectral analysis

Other keywords: optical amplification; DD method; turbulence effects; optical spatial filtering technique; noise filtering; free-space optical communications; FSO communication; scintillation minimization; Erbium-doped fiber amplifier; beam wander; spatial noise; EDFA; OSF detection method; beam wandering mitigation; spectral analysis

Subjects: Spatial filters, zone plates, and polarizers; Free-space optical links; Optical, image and video signal processing; Fibre lasers and amplifiers; Fibre lasers and amplifiers; Optical coatings and filters; Optical communication devices, equipment and systems

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