ATIS Telecom Glossary
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launch numerical aperture (LNA)
The numerical aperture of an optical system used to couple (launch) power into an optical fiber. Note 1: LNA may differ from the stated NA of a final focusing element if, for example, that element is underfilled or the focus is other than that for which the element is specified. Note 2: LNA is one of the parameters that determine the initial distribution of power among the modes of an optical fiber.

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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