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In this paper, a novel nested photonic crystal fiber (PCF) with two guided modes regions is proposed, which can support 80 orbital angular momentum (OAM) modes over C wavelength band. The characteristics of designed nested PCF are systematically analyzed by using the finite element method (FEM). The results show that the isolation is kept above 40dB, the crosstalk between different guided modes regions can be neglected, and the dispersion is relatively flat, the nonlinear coefficient is lower than 2.65km−1W−1. Additionally, the confinement loss and effective mode field area of the designed nested PCF are also analyzed. In summary, the designed nested PCF has potential applications in the high capacity fiber communication of mode division multiplexing (MDM). [ABSTRACT FROM AUTHOR]

A squeezed triangular lattice photonic crystal fiber (PCF) composed of elliptical air holes is presented in this paper. Full vector finite element method (FEM) is used to investigate the guiding property. By adjusting the size of air holes in cladding, the fiber offers a flat negative dispersion of -1343.46 ± 6.74 ps/(nm.km) over the wavelength bands of S+C+L+U. The birefringence can be on the order of 1 0 − 2 which reaches up to 3.72 × 1 0 − 2 at the wavelength of 1. 55 μ m. The proposed PCF may show some important applications in residual dispersion compensation and polarization maintaining fibers. [ABSTRACT FROM AUTHOR]