Material Dispersion Coefficient

Material dispersion coefficient ( λ ): In an optical fiber, pulse broadening per unit length of fiber and per unit of spectral width, usually expressed in picoseconds per (nanometre·kilometre). Note 1: For many optical fiber materials, M (λ) approaches zero at a specific wavelength λ₀ between 1.3 μm and 1.5 μm. At wavelengths shorter than λ₀, M (λ) is negative and increases with wavelength; at wavelengths longer than λ_0,, M (λ) 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 (λ) and spectral width (Δλ), where n is the refractive index of the material N is the group index expressed as λ is the wavelength of interest c is the velocity of light in vacuum. Source: from Federal Standard 1037C

 

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