Santec PEM-340 - Stopped Polarizer Function; High Speed Measurement

4-2
PEM-340 Operation Manual
The PEM-340 measures PER using a rotating polarizer. In some circumstances, such as the
automatic alignment of the lateral orientation of an optical ber 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 exibility and enables the
polarizer to be stopped at the angle of either maximum or minimum power transmission.
4-5. Stopped Polarizer Function
To provide additional exibility the PEM-340 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 to either
5 or 10Hz.
4-6. High Speed Measurement