EXFO FTB-5600 Distributed PMD Analyzer - Manual (Page 9)

Introducing the FTB-5600 Distributed PMD Analyzer
Distributed PMD Analyzer 3
Frequently Used Terms
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.