New type of single mode optical fibres

The new algorithm of single-mode fibres synthesis for given values of phase and group speeds of propagation mode on fixed normalized frequency is proposed and realized. New types of single-mode graded dielectric waveguides with an extended band of single-mode regime and increased cross sections of core are received. The dependence between bandwidth of single-mode regime and values of phase and group speed of propagating mode for fixed frequency is established. The dispersion characteristics and distribution of propagating mode field in synthesized waveguides are calculated.