Open AccessMeasurement of orbital angular momentum spectra of multiplexing optical vortices
Author(s) -
Shiyao Fu,
Shikun Zhang,
Tonglu Wang,
Chunqing Gao
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.006240
Subject(s) - optical vortex , optics , angular momentum , physics , multiplexing , diffraction , orbital angular momentum multiplexing , vortex , orthogonality , diffraction efficiency , optical communication , diffraction grating , angular spectrum method , physical optics , orbital angular momentum of light , telecommunications , total angular momentum quantum number , computer science , quantum mechanics , mathematics , geometry , thermodynamics
Optical vortex beams carrying orbital angular momentum (OAM) are widely investigated for their unique performance in recent years. They can be used to extend the capacity of optical communications system due to the orthogonality of different channels. In the receiver side of a multiplexing optical vortices system, verifying the OAM spectrum is of great importance. A new kind of diffraction element called Dammann vortex grating can distribute energies among different diffraction orders equally. Based on this unique characteristic, we reported a new algorithm to analyze the spot of each diffraction order. The OAM spectrum in the receiver side can then be obtained. In the experiment, the OAM spectrum measurement of at most six-channel multiplexing optical vortices is realized. The experimental results illustrate that the OAM spectrum gained by this approach is highly consistent with the theoretical value.