W/D JANUARY 2003 NO S/S
This document describes a method for the qualification of a
higher-order mode filter to be used for making measurements on a
single-mode fiber. This type of mode filter is required when effectively
single-moded operation of short lengths of single-mode fiber is needed
at wavelengths near cutoff wavelength of the first higher-order mode (as
measured 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 wavelengths
of interest.
| Edition : | 91 |
| File Size : | 1
file
, 490 KB |
| Number of Pages : | 14 |
| Published : | 10/01/1991 |
