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Step-index profile

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	Topics Step-index profile Topic Home For an optical fiberOptical fiber An optical fiber or fibre is a thin, transparent fiber, usually made of glass or plastic, for transmitting light.... , a step-index profile is a refractive indexRefractive index The refractive index of a material is the factor by which the phase velocity of electromagnetic radiation is slowed in that... profile characterized by a uniform refractive index within the core and a sharp decrease in refractive index at the core-claddingCladding Overview Cladding is the covering of one material with another.... so that the cladding is of a lower refractive index. The step-index profile corresponds to a power-law index profileFacts About Power-law index profile For optical fibers, a power-law index profile is a class of graded-index profiles characterized by [EQUATION MISSING] where ... with the profile parameter approaching infinity. The step-index profile is used in most single-mode fibers and some multimode fibers. A step-index fiber is characterized by the core and cladding refractive indices n₁ and n₂ and the core and cladding radii a and b. Examples of standard core and cladding diameters 2a/2b are 8/125, 50/125, 62.5/125, 85/125, or 100/140 (units of µm). The fractional refractive-index change . n₁ is typically between 1.44 and 1.46, andis typically between 0.001 and 0.02. Step-index optical fiber is generally made by dopingDoping (semiconductor) In semiconductor production, doping refers to the process of intentionally introducing impurities into an extremely pure sem... high-purity fused silica glass (SiO₂) with different concentrations of materials like titanium, germanium, or boron. See also Graded-index fiberGraded-index fiber In fiber optics, a graded-index or gradient-index fiber is an optical fiber whose core has a refractive index that dec... Critical AngleTotal internal reflection Total internal reflection is an optical phenomenon that occurs when light is refracted at a medium boundary enough to send ... Numerical apertureNumerical aperture In optics, the numerical aperture of an optical system is a dimensionless number that characterizes the range of angles ove... See also Federal Standard 1037CFederal Standard 1037C Federal Standard 1037C, entitled Telecommunications: Glossary of Telecommunication Terms is a United States Federal St... MIL-STD-188MIL-STD-188 MIL-STD-188 is a series of U.S. military standards relating to telecommunications....