Encyclopedia > Normalized frequency

  Article Content

Normalized frequency

In telecommunication, the term normalized frequency ( V ) has the following meanings:

1. In an optical fiber, a dimensionless quantity, V , given by where a is the core radius, λ is the wavelength in vacuum, n 1 is the maximum refractive index of the core, and n 2 is the refractive index of the homogeneous cladding[?].

Note 1: In multimode operation of an optical fiber having a power-law refractive index profile[?], the approximate number of bound modes, i.e., the mode volume, is given by where V is the normalized frequency greater than 5 and g is the profile parameter[?].

Note 2: For a step index fiber, the mode volume is given by V 2/2. For single-mode operation, V < 2.405. Synonym V number.

2. The ratio between an actual frequency and a reference value.

3. The ratio between an actual frequency and its nominal value.

Source: from Federal Standard 1037C and from MIL-STD-188



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Tidal force

... gives: <math> F_t = \frac{2GMm} {r^3}, dr << r </math> where M is the mass of the primary body, m is that of the orbiting body, r is the orbital ...