Circular-lattice microstructured optical fibers with near-zero ultra-flattened chromatic dispersion and high birefringence

In the present study, a dispersion flattened microstructured optical fiber (MOF) with extremely low dispersion value and high birefringence is proposed. The proposed MOF is composed by manipulating the number of air-holes, presents in different rings of a regular circular-lattice MOF. The dispersion and bire-fringence characteristics of the proposed MOF are numerically analyzed by applying finite difference field convergence approach. Moreover, the other light-guiding characteristics, e.g., fundamental mode-field pattern, effective refractive index, effective mode-field area and nonlinear characteristics of the fiber are explored as well. Numerical results show that flattened dispersion around 0 +/- 1.3 ps/(nm.km) can be reached inside the spectral range 1120-2100 nm bounding a huge bandwidth of 980 nm. Numerical results also show that birefringence with the order of 10(-4) can be obtained at 1550 nm. Copyright (c) 2022 Elsevier Ltd. All rights reserved.