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The Simulation and analysis of the SMF is carried out with the total loss of the germania-doped silica-core fibers can be separated into the inherent ultraviolet absorption loss, the scattering loss and the inherent infrared absorption loss. It is also seen that the ultraviolet absorption loss and the scattering loss are dominated at the short wavelengths below 1.2 ?m and the infrared absorption loss is dominated at longer wavelengths above 1.5 ?m. The dopants have a great effect on the transmission loss of high-silica glass optical fibers at long wavelengths. When an optimum dopant is selected for making a doped-silica optical fibers and OH content is greatly reduced, a phenomenally broad window where the loss is below 1 dB/Km can be achieved. An ultimate lower loss SMF has been fabricated by reducing the excess loss due to imperfections of waveguide as much as possible. The loss mechanism in the optical fiber discussed has been also analyzed. Transmission losses have been reduced almost down to the intrinsic material loss and the minimum loss is 0.20 dB/Km at 1.55 ?m. The dispersion characteristics also analyzed at long wavelength the dispersion is minimized, thus it is confirmed that the single mode fibers are most applicable for long distance and large capacity transmission.