ATIS Telecom Glossary
Tuesday, September 02, 2014

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material dispersion coefficient [M()]

In an optical fiber, pulse broadening per unit length of fiber and unit spectral width, usually expressed in picoseconds per (nanometer•kilometer). Note 1: For many silica-based fibers, M() approaches zero at a specific wavelength 0 between 1.3 m and 1.5 m. At wavelengths shorter than 0, M() is negative and increases with wavelength; at wavelengths longer than 0,, M() is positive and decreases with wavelength. Note 2: Pulse broadening caused by material dispersion in a unit length of optical fiber is given by the product of M() and spectral width ().

Note 3: The material dispersion coefficient M() is given by equation 22

where is the refractive index of the material, N is the group index expressed as equation 23

where is the wavelength of interest, and c is the velocity of light in vacuuo.

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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