Abstract
Exact analytical solutions are given for modal cutoff frequencies in round optical fibres with a central refractive-index depression represented by a radial index distribution Rp in the core. The cutoff frequencies Vc for modes with azimuthal order m are the solutions of Jq−1(2Vc/{2+p})=0, where q = 2m/(2 + p). An accurate analytical approximation formula for the cutoff of the LP11 mode is developed, which even circumvents the calculation of real-order Bessel function zeros. For the LP02 mode, as well as for all other circularly symmetric modes, the exact cutoff frequency is merely a linear function of the profile parameter p.
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Renner, H. Cutoff frequencies in optical fibres with central refractive-index depression. Optical and Quantum Electronics 29, 591–604 (1997). https://doi.org/10.1023/A:1018528222149
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DOI: https://doi.org/10.1023/A:1018528222149