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Normalized frequency (fiber optics)

From Wikipedia, the free encyclopedia

In an optical fiber, the normalized frequency, V (also called the V number), is given by

where a is the core radius, λ is the wavelength in vacuum, n1 is the maximum refractive index of the core, n2 is the refractive index of the homogeneous cladding, and applying the usual definition of the numerical aperture NA.

In multimode operation of an optical fiber having a power-law refractive index profile, the approximate number of bound modes (the mode volume), is given by

where g is the profile parameter, and V is the normalized frequency, which must be greater than 5 for the approximation to be valid.

For a step index fiber, the mode volume is given by 4V2/π2. For single-mode operation is required that V < 2.4048, which is the first root of the Bessel function J0.

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  •  This article incorporates public domain material from the General Services Administration document: "Federal Standard 1037C". (in support of MIL-STD-188)
This page was last edited on 30 September 2020, at 20:33
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