An analytic approximant is found for the fundamental guided mode of advanced technology optical fibres using a two-point quasi-rational approximation method. Very accurate results are obtained particularly in the linearly varying refractive index core, the maximum error being less than 1 × 10-6. The fractional power transport across the fibre is also given. © 2006 Elsevier B.V. All rights reserved.
Castro, E., Martín, P., & Ladera, C. L. (2006). Fundamental mode in advanced technology optical fibres by two-point quasi-rational approximations. Physics Letters, Section A: General, Atomic and Solid State Physics, 358(1), 80–84. https://doi.org/10.1016/j.physleta.2006.04.112