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7 Maintenance and Service

Extinction Ratio Warnings Error Messages

Incomplete circle due to insufficient number of measurement values. Increase fiber

stress or extend measurement time.

The change of polarization during the measurement was insufficient to draw a full circle on

the Poincaré Sphere.

ð Increase the fiber stress during measurement.

ð Alternatively, increase the measurement time.

Circle completed, but the distance between adjacent measurement points is too

large for accurate measurement. Decrease fiber stress and increase measurement

time.

The change of polarization during the measurement was sufficient to draw a full circle on

the Poincaré Sphere, but the number of measurement points was insufficient to approxim-

ate a circle with the necessary accuracy.

ð Decrease the fiber stress during measurement and increase the measurement time.

Eigenmodes of the fiber under test are not strictly linear or measurement is noisy.

ER cannot be calculated.

The change of polarization led to a non-circular trace on the Poincaré Sphere.

ð The optical power is too low, so that noise interfered the measurement.

Check your setup for possible power loss, or increase the optical power of your laser

source.

ð The fiber under test behaved not like a PM fiber.

Check if the fiber as specified as a PMF.

If so, check if the operating wavelength of your PM fiber matches with the measure-

ment wavelength.

The circle on the Poincare sphere is too small. The calculated ER is above the the-

oretical maximum accuracy. Please check if stress was applied to the fiber during

the measurement.

The measured ellipticity change is close to or less than the PAX1000 measurement accur-

acy.

ð Was the fiber Increase the fiber stress during measurement?

The ellipticity of some points is bigger than |25°|. Eventually there is a problem on

the coupling into the fiber or there is constantly stress on the fiber.

The output SOP was of a too high ellipticity.

ð Check your setup for proper coupling of the light source into the fiber under test. The

light must be coupled in parallel to the slow axis of the fiber.

ð Check your light source for strictly linear polarization.

ð Check if your fiber under test is exposed to a permanent stress due to extreme bending

or squeezing. Also, the connectorization of the fiber might be not stress-less.

THORLABS PAX1000 User Manual

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