Opto-Electronic Advances
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2018 Vol. 1, No. 5
Cover Story:Wei S B, Wang D P, Lin J, Yuan X C. Demonstration of orbital angular momentum channel healing using a Fabry-Pérot cavity. Opto-Electronic Advances 1, 180006 (2018).

Orbital angular momentum (OAM) mode division provides a promising solution to push past the already exhausted degrees of freedom available in conventional optical communications. Nevertheless, the practical deployment of OAM within a free-space optical (FSO) communications system is still hampered by a major challenge, namely that OAM-based FSO links are vulnerable to disturbances. Though several techniques, such as using various non-diffraction beams and multiple transmit–receive apertures, are proposed to alleviate the influence of disturbances, these techniques significantly reduce the performance with regard to combating single fading for spatial blockages of the laser beam by obstructions. In this work, we initially demonstrate that the broken OAM beam could be healed by a high-q Fabry-Pérot (FP) resonant cavity when the OAM beam is resonating in the cavity. The experiment results showed that an OAM beam with the blocking percentage of over 50% can be healed.
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Online Time:Jul 06, 2018
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Cite this article:
Wei S B, Wang D P, Lin J, Yuan X C. Demonstration of orbital angular momentum channel healing using a Fabry-Pérot cavity. Opto-Electronic Advances 1, 180006 (2018). 
  Review
Online Time:Jun 29, 2018
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Cite this article:
Nemati A, Wang Q, Hong M H, Teng J H. Tunable and reconfigurable metasurfaces and metadevices. Opto-Electronic Advances 1, 180009 (2018).