Far Field Technique Applied in Single Mode Optical Fibers for Studying of Modal Field Diameter

The far field technique is used for measuring the mode field diameter into single mode optical fibers. This is a main characteristic involved for detecting loss. The mode field diameter is an irradiance power distribution expression per unit area through fiber-end face. For a power distribution Gaussian into single mode optical fibers the mode field diameter in which the electric field and magnetic field are reduced. The technique far field allows to measure the irradiance in a fiber-end face. The far field power distribution describes the emitted power per unit area in the far field region. The far-field region is the region far from the fiber-end face. The mode field diameter is affected by blending loss, join loss, splicing loss, dispersion wave guides, as well as devices involved in optical link (regenerators, amplifiers, multiplex, etc.)