Exfo FTB-5600 Distributed PMD Analyzer Instrukcja Użytkownika Pobierz pdf (Strona 9)

Introducing the FTB-5600 Distributed PMD Analyzer

Distributed PMD Analyzer 3

Frequently Used Terms

Some specific terms are used frequently in this user guide.

Term Definition

APD Avalanche photo diode.

Beating length Length required in the fiber for the Fast Polarization to

be ahead by one complete period over the Slow

Polarization.

Bidirectional A combination of two traces taken from opposite

directions of a same fiber. The trace can overlap fully,

partly, or not at all.

Cumulative PMD The PMD value up to a distance in a fiber.

Depolarization Light that is not polarized. In the case of the FTB-5600,

we use this term to define zone on the fiber where the

instrument cannot perform a measurement since light

is entirely depolarised. For more information, see page

67.

DGD Differential group delay.

Estimation table Table used to estimate the PMD value of a link by

changing values of target strong PMD sections.

FUT Fiber under test

OTDR Optical time domain reflectometer.

PBS Polarization beam splitter

PMD Polarisation mode dispersion.

PMD coefficient Represents the PMD characteristics of one particular

length of the fiber. Since PMD adds to the square, its

unit is typically calculated in picoseconds per square

root of kilometer.

PMD resolution Sets the minimum PMD value to be measured on the

link.

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Exfo FTB-5600 Distributed PMD Analyzer Instrukcja Użytkownika Strona 9