Step-index profile

For an

Step-index optical fiber is generally made by doping high-purity fused silica glass (SiO₂) with different concentrations of materials like titanium, germanium, or boron.

Modal dispersion in a step index optical fiber is given by

${\displaystyle {\text{pulse dispersion}}={\frac {\triangle \ n_{1}\ \ell }{c}}\,\!}$

where

${\displaystyle \triangle \,\!}$ is the fractional index of refraction

${\displaystyle n_{1}\,\!}$ is the refractive index of core

${\displaystyle \ell \,\!}$ is the length of the optical fiber under observation

${\displaystyle c}$ is the speed of light.

See also

• Graded-index fiber
• Critical angle
• Numerical aperture

References

 This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).

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