Santec PEM-320, Operation Manual

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3-2
PEM-320 Operation Manual
The PEM-320 measures PER using a rotating polarizer. In some circumstances, such as the automatic
alignment of the lateral orientation of an optical fiber to a laser light source, it is useful to be able to stop
the polarizer and measure the optical power with a faster response time than the 10Hz rotation will
allow. The Stopped Polarizer Function provides this flexibility and enables the polarizer to be stopped
at the angle of either maximum or minimum power transmission.
3.5. Stopped Polarizer Function
To provide additional flexibility the PEM-320 can operate at one of three measurement speeds. The
default 2.5Hz measurement speed is recommended as it provides the highest dynamic range for both
PER and optical power. However, when required, the measurement speed can be increased through
software control to either 5 or 10Hz.
3.6. High Speed Measurement