Document #: GP-UM-PMD-1000-21
Page 42 of 122
the current DGD and SOPMD corresponding to the index. Use the arrow keys to
select the desired PMD index. The PMD state updates in real time as the index is
changed. When the desired PMD state is selected, press the ENTER key to begin
polarization optimization at that state. The display changes to the following
screen:
The DOP measured at the input (I) and output (O) polarimeters will update in real
time. Use the left arrow key to stop the SOP searching and return the display to
the previous (index selection) screen.
4.2.7 Manual:
The manual polarization control function allows the user to tune the polarization state via
direct control of the voltages applied to each of the 6 channels of the PMDPro’s
polarization controller. It can be used to quickly find a particular SOP or for fine
adjustment to optimize a worst-case SOP for PMD tolerance testing. When the
MANUAL key is pressed, the LCD displays the following set of screens:
When the cursor is on the channel selection position (cursor blinking on the 1 of V1, for
example), the arrow keys can be used to move between channels. From a channel
selection position, pressing ENTER will move the cursor to the voltage corresponding to
the current channel position. Once on the voltage, use the arrow keys to set the voltage
for that channel (left and right arrow to move between digits and up and down arrows to
change the value of the selected digit). The voltage range for each channel is 0.0 to
150.0V, and V
π
for each channel is about 30V. The channel voltages are updated in real
time as the settings are changed so that the effects of the SOP change can be observed.
Pressing ENTER when the cursor is on a voltage setting position will advance it to the
next channel selection position.
V3: 75.0V
V4: 75.0V
↑
V5: 75.0V
V6: 75.0V
V1: 75.0V
V2: 75.0V
V3: 75.0V
V4: 75.0V
↓
DOP I: 33.6%
O: 91.5%
31.42ps 0.0ps2
