Speckle-based structured light shift-keying for non-line-of-sight optical communication

We report an experimental proof of concept for speckle-based one-to-three non-line-of-sight (NLOS) free space optical (FSO) communication channels employing structured light shift-keying. A 3-bit gray image of resolution 100×100 pixels is encoded in Laguerre–Gaussian or Hermite–Gaussian beams and de...

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Bibliographic Details
Published in:Applied optics (2004) 2023-08, Vol.62 (23), p.G53
Main Authors: Badavath, Purnesh Singh, Raskatla, Venugopal, Chakravarthy, T. Pradeep, Kumar, Vijay
Format: Article
Language:English
Subjects:
Artificial neural networks
Channels
Free-space optical communication
Gaussian beams (optics)
Keying
Line of sight communication
Speckle patterns
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Summary:We report an experimental proof of concept for speckle-based one-to-three non-line-of-sight (NLOS) free space optical (FSO) communication channels employing structured light shift-keying. A 3-bit gray image of resolution 100×100 pixels is encoded in Laguerre–Gaussian or Hermite–Gaussian beams and decoded using their respective intensity speckle patterns via trained 1D convolutional neural network. We have achieved an average classification accuracy of 96% and 93% using LG ml and HG pq beams, respectively, among all three channels. It demonstrates the directional independence and broadcasting capability of speckle-based decoding (SBD) in FSO communication using structured light. Further, we have extended the study from 2D to 1D SBD in one-to-three NLOS FSO communication channels to decrease the computational cost and to emphasize the importance of the 1D SBD approach.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.486919