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IEVref:731-03-76ID:
Language:enStatus: Standard
Term: material dispersion parameter
Synonym1:
Synonym2:
Synonym3:
Symbol: М
Definition: the quantity which characterizes the material dispersion defined as:
M( λ )= 1 c 0 dN dλ = λ d 2 n c 0 d λ 2 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiaad2eadaqadaqaai abeU7aSbGaayjkaiaawMcaaiabg2da9iabgkHiTmaalaaabaGaaGym aaqaaiaadogadaWgaaWcbaGaaGimaaqabaaaaOWaaSaaaeaacaqGKb GaamOtaaqaaiaabsgacqaH7oaBaaGaeyypa0ZaaSaaaeaacqaH7oaB caqGKbWaaWbaaKqaafqabaGaaGOmaaaakiaad6gaaeaacaWGJbWaaS baaSqaaiaaicdaaeqaaOGaaeizaiabeU7aSnaaCaaajeaqbeqaaiaa ikdaaaaaaaaa@4DCA@

where

n is the refractive index,
N is the group index,
λ is the wavelength in vacuum, and
c0 is the speed of light in vacuum

NOTE 1 – For many optical fibre materials, M is zero at a specific wavelength λ0, usually around 1300 nm. The sign convention is such that M is positive for wavelengths shorter than λ0 and negative for wavelengths longer than λ0.

NOTE 2 – Pulse broadening caused by material dispersion in a unit length of optical fibre is give by M times spectral linewidth (Δλ), except at or near λ = λ0, where terms proportional to (Δλ)2 are important.


Publication date:1991-10
Source:
Replaces:
Internal notes:2016-02-08: Editorial correction: <i>c</i> corrected to <i>c</i><sub>0</sub> in accordance with correspondence with VT 60050 convenor 2016-12-06. JGO
2016-03-07: Editorial changes: "velocity of light in vacuum" replaced by "speed of light in vacuum". See correspondence "Questions re part 731" 2015-02 and 2015-03. JGO


2017-06-02: Cleanup - Remove Attached Image 731-03-76.gif
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