© 2019 Thorlabs GmbH37
PAX1000
is connected to the output of the polarization controller and the input of the polarimeter (the dis-
continued polarimeter model PAX5720 is shown).
The fiber is heated when the filament bulb in the center of the looped fiber is turned on, which
stresses the fiber. However, the stress can also be applied mechanically, e.g. by pulling the
fiber manually.
Note
The mentioned above stress methods are applicable only to PMF without tubing!
During measurement, i.e., when the fiber is stressed, the PMF output SOP (State of Polariza-
tion) describes a circle on the Poincaré Sphere. For reliable ER Measurement results, at least a
full circle must be drawn (i.e. the stress must vary enough during the test to result in this min-
imum change in polarization state).
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