W/D JANUARY 2003 NO S/S
This document describes a method for the qualification of ahigher-order mode filter to be used for making measurements on asingle-mode fiber. This type of mode filter is required when effectivelysingle-moded operation of short lengths of single-mode fiber is neededat wavelengths near cutoff wavelength of the first higher-order mode (asmeasured by FOTP-80).It is not meant to be used in the 800 nm region.Effectively single-moded operation is necessary: a.when making cutback measurements of spectral attenuation (per FOTP-78), b.when making mode field diameter measurements (per FOTP-164, 167, or 174), c.whenever short lengths of fiber are used.This test procedure uses a method similar to that of FOTP-80, Method B,to ensure that the fiber is effectively single-moded at the wavelengthsof interest.
- Edition:
- 91
- Published:
- 10/01/1991
- Number of Pages:
- 14
- File Size:
- 1 file , 490 KB
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