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Novel triangular lattice photonic crystal fiber (PCF) having vastly negative trodden chromatic dispersion over the S+C+L bands with a very high birefringence has been presented in this paper. To investigate different optical and electrical properties associated with the proposed fiber, finite element method (FEM) is deployed. The fiber presents a flattened negative dispersion of -698.5 &#x00B1; 5 ps/(nm-km) over the wavelength of 1440 nm to 1600 nm. Besides, the proposed PCF displays a high birefringence of 1.886&#x00D7;10<sup>-2</sup> at 1550 nm wavelength. Furthermore, the nonlinearity, single modeness, effective area etc. of the proposed PCF are thoroughly discussed. The fiber would have important applications in broadband residual dispersion compensation as well as polarization maintaining applications.

Large negative flattened dispersion over the S+C+L bands using highly birefringent photonic crystal fiber