Please use this identifier to cite or link to this item:

Atmospheric turbulence mitigation in Free Space Optical communication systems with retro-modulators

File Description Size Format  
Saint Georges Chaumet Eric r.pdf Version for non-UH users. Copying/Printing is not permitted 8.94 MB Adobe PDF View/Open
Saint Georges Chaumet Eric uh.pdf Version for UH users 9.19 MB Adobe PDF View/Open

Item Summary

Title:Atmospheric turbulence mitigation in Free Space Optical communication systems with retro-modulators
Authors:Saint Georges Chaumet, Eric Bertrand
Keywords:Free Space Optical communication systems
atmospheric turbulence mitigation
Date Issued:Dec 2010
Publisher:[Honolulu] : [University of Hawaii at Manoa], [December 2010]
Abstract:After a brief description of the Free Space Optical communication systems that has been developed for both direct mode and retro mode and which are used by the Naval Research Laboratory for their research on modulating retro-reflectors, this paper presents the implementation of an efficient cone-tracking algorithm for the optimization of the beam pointing in retro-mode links. It is shown how the algorithm can be augmented in order to support the same function in direct-mode links. Furthermore it is shown how this cone-tracking technique, implemented initially to compensate for the system misalignment and the slow drifts related to temperature or remote distance changes, can be used to characterize the beam wander in the far field.
The results of a beam wander measurement experiment are then discussed. These results led to developing a multi-dithering adaptive optics algorithm to mitigate the effect of atmospheric turbulence in a retro-mode link. This algorithm works by optimizing the power coupled into the MRR and therefore reducing the fluctuations of the power reflected back to the Interrogator. This algorithm can be thought of as an extension of the cone-tracking technique to higher order aberrations.
Finally, results are presented of a proof of concept laboratory experiment of this single-metric multi-dithering modal AO algorithm applied to the coupling into a single mode fiber. The results show the successful convergence of the simultaneous compensation of six low order aberrations.
The conclusion is that using faster hardware these encouraging results could eventually lead to a significant reduction of the power fluctuation induced by the atmospheric turbulence in a FSO retro-mode link.
Description:Ph.D. University of Hawaii at Manoa 2010.
Includes bibliographical references.
Appears in Collections: Ph.D. - Electrical Engineering

Please email if you need this content in ADA-compliant format.

Items in ScholarSpace are protected by copyright, with all rights reserved, unless otherwise indicated.