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Recently, Rodenburg et al (2014 New J. Phys. 16 033020) presented an approachfor simulating propagation over a long path of uniformly distributedKolmogorov-spectrum turbulence by means of a compact laboratory arrangementthat used two carefully placed and controlled spatial light modulators. We showthat their simulation approach mimics the behavior of plane-wave propagation,rather than general beam-wave propagation. Thus, the regime in which theirorbital angular momentum (OAM) cross-talk results accurately represent thebehavior to be expected in horizontal-path propagation through turbulence maybe limited to collimated-beam OAM modes whose diameters are sufficient thatturbulence-induced beam spread is negligible.

Comment on `Simulating thick atmospheric turbulence in the lab with application to orbital angular momentum communication'