Speaker
Mr
Lucas Gailele
(Csir)
Description
Optical communication systems optimize multiplexing in polarization and wavelength both transmitted in fiber and free-space to attain high bandwidth data communication. We are expected to reach a bandwidth ceiling in the near future due to non-linear effects in fiber. Communications using orbital angular momentum (OAM) carrying modes offers infinite dimensional states, providing means to increase link capacity by multiplexing spatially-varying modes in both the azimuthal and radial degrees of freedom. OAM modes are multiplexed and de-multiplexed by the use of spatial light modulators. Implementation of complex amplitude modulation is employed on a laser beam’s phase and amplitude to generate Laguerre-Gaussian modes. The modal decomposition technique is employed to detect these modes due to their orthogonality as they propagate in space. We demonstrate data transfer by sending images as a proof-of concept in a lab-based scheme. We demonstrate the creation and detection of OAM modes in the mid-IR region as a precursor to a mid-IR free-space
communication link and attempt to improve data transmission in the atmosphere and show improved image resolution by reconstructing the wave front of mid-IR light.
Main supervisor (name and email)<br>and his / her institution
Prof Andrew Forbes
Andrew.Forbes@wits.ac.za
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
Msc
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Primary author
Mr
Lucas Gailele
(Csir)
Co-authors
Prof.
Andrew Forbes
(CSIR)
Dr
Angela Dudley
(CSIR National Laser Centre)
Mr
Loyiso Maweza
(CSIR)
