Scanning the Poincare Sphere
Example: Measuring the Response to a "Depolarized" Signal
32
Agilent
8169A
Polarization Controller, Second Edition
Example: Measuring the
Response to a "Depolarized"
Signal
To measure the response to a \depolarized" signal for a device under test
(DUT), the steps are
1
Set the polarizing filter.
2
Set the scanning speed to Fast.
3
Set the averaging time of the power meter.
4
Start the scan, and measure the value.
For this example, you will need, apart from the polarization controller, a
laser source, and a power meter (in the description below, an Agilent
8163B Lightwave Multimeter with a laser module and a sensor module are
used). A roll of fiber will act as a suitable DUT.
1
With both instruments switched off, connect the laser source to the polarization
controller.
2
Connect the polarization controller to the power meter.
Figure 9 Setup for setting the position of the polarizing filter.
3
Switch on both instruments, and enable the laser source.
4
Set the channel with the sensor module to the wavelength of the source, and
select the default averaging speed (200 ms) [Press
to select T, hold
to reset T].
Under normal circumstances you should leave the instruments to warmup.
(The multimeter needs around 20 minutes to warm up.) Warming up is
necessary for accuracy of the sensor, and the output power of the source.
N O T E
