Spatial-diversity detection of optical vortices for OAM signal modulation

Jaime Anguita*, Jaime Cisternas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We propose a method for identifying orbital angular momentum (OAM) states within a vortex superposition using a Shack-Hartmann (SH) sensor as a spatial-diversity detector. We define a local OAM at every pixel of the SH image, from which we construct an OAM spectrum. The topological charges are determined fromtheOAMspectrum using a low-complexity algorithm, resulting in estimates that are robust to beam wandering. Data from a 200 m experimental transmission are successfully tested using the proposed technique.

Original languageEnglish
Pages (from-to)5534-5537
Number of pages4
JournalOptics Letters
Issue number19
StatePublished - 30 Sep 2020

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© 2020 Optical Society of America.


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