This procedure is restricted to wavelengths at which the fiber is effectively single-mode. The cutoff wavelength λcf of an un-cabled fiber may be determined by FOTP-80, while the cutoff wavelength λcf of a cabled fiber may be determined by FOTP-170.
This method is intended for installed cabled fibers without amplification, with PMD values in the range 0.1 to 20 ps.
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