What is fiber optic slope fo dispersion?
The rate of change of dispersion with respect to wavelength at the zero-dispersion point is called the zero-dispersion slope. Doubly and quadruply clad single-mode fibers have two zero-dispersion points, and thus two zero-dispersion slopes. In a single-mode optical fiber, the zero-dispersion wavelength is the wavelength or wavelengths at which material dispersion and waveguide dispersion cancel one another. In all silica-based optical fibers, minimum material dispersion occurs naturally at a wavelength of approximately 1.3 µm. Single-mode fibers may be made of silica-based glasses containing dopants that shift the material-dispersion wavelength, and thus, the zero-dispersion wavelength, toward the minimum-loss window at approximately 1.55 µm. The engineering tradeoff is a slight increase in the minimum attenuation coefficient. Such fiber is called dispersion shifted fiber. Another way to alter the dispersion is changing the core size and the refractive indices of the mateial of core an
