Dispersion and energy parameters of the HE1m modes of two-layer optical fibres

Dispersion and energy parameters of the HE_1m modes of multimode two-layer step-index optical fibres are studied. The results of studies on chromatic dispersion for wavelengths λ < 1.3 μm and λ > 1.3 μm, phase and group delays, waveguide and material dispersions of the modes, as well as results of calculations of fibre core diameters, normalised powers and corresponding effective areas of HE_1m modes are presented under conditions of the zero chromatic dispersion at λ₀ = 1.55 and 1.06 μm.