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Description / Abstract:
This procedure establishes the light launch conditions for Class Ia
fiber attenuation measurements. Primary uses include FOTP-46, FOTP-53
and FOTP-61.
Either of two methods is allowed. Method A uses overfilled launch
conditions along with a mandrel wrap mode filter; Method B uses
restricted launch conditions created by beam optics. Both Methods have
yielded attenuation values that add approximately linearly in
concatenated links.
Values obtained by Methods A and B may not exactly agree, and care must