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Appl Opt. 2017 Mar 1;56(7):1990-1995. doi: 10.1364/AO.56.001990.

Linearly polarized orbital angular momentum mode purity measurement in optical fibers.

Abstract

We presented a simple method for measuring the mode purity of linearly polarized orbital angular momentum (OAM) modes in optical fibers. The method is based on the analysis of OAM beam projections filtered by a polarizer. The amplitude spectrum and phase spectrum of a data ring derived from the beam pattern are obtained by Fourier transform. Then the coefficients of the mixed electric field expression can be determined and the mode purity can be obtained. The proposed method is validated and it is experimentally demonstrated in a two-mode fiber.

PMID:
28248400
DOI:
10.1364/AO.56.001990

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