The features of the optical pumping active fibers with three-piece inner clad

- Represents results of analytical solutions of the pump equations in GTWave3 fibers.
- Presents the analysis distribution of the pump radiation and value of the effective length GTWave3.
- Presents comparison of the pump distribution into the GTWave3 and GTWave2 fibers.

This paper presents simple model of distribution of the pump radiation in active three-piece inner clad fibers (GTWave3) and analytical solutions of the relevant differential equations. Based on these solutions has been produced the analysis of the dependence distribution of the pump radiation and value of the effective length GTWave3 from key parameters of this type of a fiber (the active-region absorption coefficient and the coupling coefficients). Also in work presents comparison of the pump distribution into the GTWave3 and GTWave2 (two-piece inner clad) fibers.