Exfo FTB-5600 Distributed PMD Analyzer Instrukcja Użytkownika Pobierz pdf (Strona 129)

Optimizing Measurements

Distributed PMD Analyzer 123

Perform Two-Sided Measurements

To make two-sided measurements bring two advantages:

³ Nearly doubles a measurement range

³ Improves the measurement accuracy.

For example, in a case where a relative small PMD section is followed by a

high PMD section, the PMD value of the small PMD section may be difficult

to measure accurately, but it may be relatively easy to measure it precisely

from another side of fiber under test if there is no very high PMD fiber(s)

from there.

By combining two-sided measurements together, you can have a better

and clearer cumulative PMD picture with a less measurement uncertainty.

Perform Multiple Measurements

Making multiple measurements over a long time or at different times may

be helpful to reduce a fundamental PMD uncertainty if a measured PMD

from the FUT is unstable. Using a larger number of SOPs and wavelengths

may also result in a long acquisition time that would help to improve the

measurement and reduce measurement uncertainty.

Note: Averaging the measured PMD over time might be helpful to reduce a

fundamental PMD uncertainty due to a limited wavelength range.

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Exfo FTB-5600 Distributed PMD Analyzer Instrukcja Użytkownika Strona 129