In this paper are presented results of optimization of double cladding PS1-type profile fiber. The aim of optimization was to maximize simultaneously single mode operating range and scope of anomalous dispersion in the vicinity of the third transmission window. The optimization process was conducted in two variants. In both cases the output quantity was optimal value of normalized frequency VOPT. In the first variant the normalized frequency V was optimized as a function of the quotient of refractive indices difference Δn'/Δn for constant ratio of fiber radii b/a. In the second variant V was optimized as a function of b/a for Δn'/Δn=constant. The optimum value of the normalized frequency VOPT explicitly specifies the value of core radius a and the value of first cladding radius b of double cladding optical fiber
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