Numerical estimation of ultrafast pulse propagation in double clad hollow core fibers

Hollow core fibers have a lot of applications in domains where delivery of ultrashort pulses is very important. On the other hand, double clad fibers are widely used for delivery and collection of nonlinear optical signals. In this paper we present a new concept of double clad hollow core fibers(DC-HCF) and we investigate the propagation of femtosecond pulses in such fibers. We use split-step Fourier method to estimate the numerical solution of the generalized nonlinear Schrödinger equations (GSNLE).