Integrated optical modulator manipulating the polarization and rotation handedness of Orbital Angular Momentum states

Recent studies demonstrated that the optical channels encoded by Orbital Angular Momentum ( OAM ) are capable candidates for improving the next generation of communication systems. OAM states can enhance the capacity and security of high-dimensional communication channels in both classical and quant...

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Bibliographic Details
Published in:Scientific reports 2017-06, Vol.7 (1), p.3835-8, Article 3835
Main Authors: Mousavi, S. Faezeh, Nouroozi, Rahman, Vallone, Giuseppe, Villoresi, Paolo
Format: Article
Language:English
Subjects:
639/624/1075/1079
639/624/1075/187
Communication
Communications systems
Handedness
Humanities and Social Sciences
Lithium
multidisciplinary
Polarization
Science
Science (multidisciplinary)
Silica
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Summary:Recent studies demonstrated that the optical channels encoded by Orbital Angular Momentum ( OAM ) are capable candidates for improving the next generation of communication systems. OAM states can enhance the capacity and security of high-dimensional communication channels in both classical and quantum regimes based on optical fibre and free space. Hence, fast and precise control of the beams encoded by OAM can provide their commercial applications in the compatible communication networks. Integrated optical devices are good miniaturized options to perform this issue. This paper proposes a numerically verified integrated high-frequency electro-optical modulator for manipulation of the guided modes encoded in both OAM and polarization states. The proposed modulator is designed as an electro-optically active Lithium Niobate ( LN ) core photonic wire with silica as its cladding in a LN on Insulator ( LNOI ) configuration. It consists of two successive parts; a phase shifter to reverse the rotation handedness of the input OAM state and a polarization converter to change the horizontally polarized OAM state to the vertically polarized one. It is shown that all four possible output polarization- OAM encoded states can be achieved with only 6  V and 7  V applied voltages to the electrodes in the two parts of the modulator.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-04118-5