Dispersion properties of double-clad hollow-core photonic bandgap fibers based on a circular lattice cladding

The major challenges in developing a fiber-optic nonlinear endomicroscope are efficient excitation light delivery and nonlinear optical signals collection, beam scanning, and probe miniaturization [1-4]. Therefore, double-clad PCFs (DCPCF) are used in nonlinear endomicroscope which can play a dual role of ultrashort pulse delivery and efficient collection of nonlinear optical signals [4]. However, due to dispersion of DCPCF, dispersion compensation systems are required. In this paper the dispersion properties and losses of new design of double-clad hollow-core photonic bandgap fibers (DCPBGFs) based on a circular lattice are investigated for the first time, by using a finite difference time domain method.