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PT-Symmetry of Multimode Waveguides: A Tool for Multichannel Communication

Abstract : The idea of Parity-Time symmetry is to exploit the special eigenvalues of coupled modes experiencing a map of balanced gain and losses. We consider multimode waveguides with transverse PT-symmetry, hence we have N parallel stripe pairs (one gain stripe and one loss stripe) in the waveguide. The evolution of eigenmodes and eigenvalues in clusters of 2N modes that undergo N successive exceptional points is evidenced for realistic and idealised structures. Targeting a regime just above an exceptional point allows a pair of modes to be selected. We show the potential for selecting such modes with a good rejection against other modes, in comparison of non PT-symmetric schemes. This could become a tool for multichannel communication.
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https://hal-iogs.archives-ouvertes.fr/hal-01714367
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Submitted on : Wednesday, August 24, 2022 - 4:04:39 PM
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H. Benisty, Anatole Lupu, Aloyse Degiron. PT-Symmetry of Multimode Waveguides: A Tool for Multichannel Communication. 17th International Conference on Transparent Optical Networks (ICTON 2015), Jul 2015, Budapest, Hungary. ⟨10.1109/ICTON.2015.7193377⟩. ⟨hal-01714367⟩

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