In a recently published paper [Opt. Lett. 37, 3636 (2012)], equations for the evolution of the beam quality in a parabolic index (PI) fiber were introduced. Use of those equations for the extraction of the parameter was erroneous, as an incorrect definition for was assumed. When defined correctly, in PI fibers is shown here to be constant. Nonetheless, the optimization of the power delivery properties of PI fibers is governed by the criterion introduced in the paper under discussion.
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