STEP INDEX PROFILE

For an optical fiber , a refractive index profile characterized by a uniform refractive index within the core and a sharp decrease in refractive index at the core- cladding interface . ( 188 ) Note 1: The step-index profile corresponds to a power-law index profile with the profile parameter approaching infinity. Note 2: The step-index profile is used in most single- mode fibers and some multimode fibers.