Abstract: A method for producing an optical fiber having desired cutoff wavelength, mode field diameter [MFD] and zero dispersion wavelength [ZDW] waveguide parameters even when actual refractive index [RI] profile has various configurations is provided. The method comprises overcladding/clad jacketing over the core rod based on predetermined core diameter of the core rod; refractive index [RI] profile of core of the core rod; and refractive index [RI] profile of clad of the core rod to achieve said waveguide parameters within the predetermined limits.

Abstract: A method for manufacturing an optical fiber having uniform refractive index profile, and substantially reduced macrobending loss and attenuation loss is provided comprising controlling one or more of parameters including concentration of dopant in outer region and inner region of the core region with respect to middle region of the core region of the optical fiber preform, duration of dehydration process step, concentration of chlorine gas to control refractive index of outer region and inner region of the core region for achieving a fiber having substantially uniform refractive index profile, and substantially reduced macrobending loss and attenuation loss.

Abstract: A method for producing optical fiber having reduced hydrogen induced loss is provided wherein the optical fiber is treated with deuterium gas for a predetermined duration. The predetermined duration of deuterium treatment is determined based on three factors, that is, a) the concentration of deuterium at which fiber is to be treated with deuterium; b) the reaction temperature at which fiber is to be treated with deuterium; and c) the pressure inside the chamber at which fiber is to be treated with deuterium.