Mr. Tarik Cigeroglu Profile

Tarik Cigeroglu

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Proceedings Article | 13 March 2024 Presentation

Rotating optical beams for communications

Enrique Galvez, Tarik Cigeroglu, Valeria Rodríguez-Fajardo, Bill Luo

Proceedings Volume PC12901, PC129010E (2024) https://doi.org/10.1117/12.3004502

KEYWORDS: Optical communications, Polarization, Phase shifts, Superposition, Polarizers, Photodiodes, Angular momentum

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We prepared Poincare beams consisting of non-separable superpositions of polarization and spatial modes bearing orbital angular momentum. A geometric phase shifter varied the phase between the component polarization modes. As a consequence, the output beam projected by a polarizer carried a spatial pattern that rotated with an angular speed proportional to the difference in topological charge of the component modes and the rate of change of the phase. We investigated the encoding of information in the angular speed of the patterns for the purpose of communications. The detection of the encoded rotation consisted of two photodiodes located off center to the pattern and forming a shallow angle from the center of the beam. Their signal was used to determine the angular speeds of the patterns. We used various types of Gaussian, non-diffracting and Einstein beams in proof-of-principle communication schemes.

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