Modal cut-off and the V-parameter in photonic crystal fibers
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We address the long-standing unresolved problem concerning the V-parameter in a photonic crystal fiber (PCF). Formulate the parameter appropriate for a core-defect in a periodic structure we argue that the multi-mode cut-off occurs at a wavelength lambda* which satisfies V_PCF(lambda*)=pi. Comparing to numerics and recent cut-off calculations we confirm this result.
3 pages including 2 figures. Accepted for Optics Letters
3 pages including 2 figures. Accepted for Optics Letters