In this paper, we analyze and propose an exponentially modulated refractive index profile for large effective area fibers with non-zero dispersion characteristics. A linear finite element method is used for computing the modal propagation characteristics and modal field distributions of an optical fiber having an arbitrary refractive index profile. The core effective area and the dispersion characteristics are optimized by optimizing a constraint objective function in the profile parametric space. The optimum refractive index profile can give a core effective area of 110 micrometers <SUP>2</SUP>. The dispersion varies linearly from 2.5 ps/nm-km to 4.5 ps/nm-km with a dispersion slope of 0.065 ps/nm<SUP>2</SUP>-km over 1.53 micrometers -1.56 micrometers wavelength range. Manufacturing tolerance analysis for the designed fiber characteristics is also studied. The bending loss for the fiber is around 0.003 dB/m for a bend radius of 100mm.
In this paper, we analyze and propose a non-uniform transmission based ramp chirp grating which can give maximum negative dispersion profile over broadband wavelength range. Coupled mode theory is used for obtaining quantitative information about the delay spectral dependence of the grating structure. A matrix method is used for analyzing the grating characteristics. For a grating length of 25 m, the grating can give negative dispersion of 266 ps/nm. When the grating is inserted after 16.07 km in line with the existing fiber optic link, the maximum average compensated dispersion lies within +/- 1.0 ps/nm-km over 1530-nm - 1560-nm wavelength range.