PSY-201 User Guide
GP-UM-PSY-201-11
Page 20 of 105
Polarization Control
The CTRL button brings up the polarization control menu, with the menu tree shown in
Figure 9. The function definition of each menu item is described in the following sections.
Use the arrow keys to move between options and the ENTER key to select a function.
Track SOP (Stokes)
This function allows the user to set and maintain a target SOP by entering the Stokes
Parameter representation of the target SOP. Use the arrow keys to input the desired values (
◄►
to move the cursor and
▲▼
to change the value of the selected digit). Press ENTER to move to
the next parameter setup position. Once all 3 values are entered, use the [Track] softkey to
automatically normalize the Stokes parameters and tune the output SOP to the desired setting. On
the OLED, a target icon appears in the top right of the screen.
Once the SOP is set, the
■
/
►
button can be used to enable/disable active stabilization of
the output SOP. The target icon indicates the enable/disable status of the function. Target =
enabled; no target = disabled.
The figure below demonstrates on the Poincaré sphere that a polarization scrambled input can be
stabilized to a specific SOP by the PSY-201.
(a)
(b)
Figure 11 (a) Input polarization pattern: triangle wave scramble at 1 Hz, taken over 20 sec.
(b) Output polarization stabilized by PSY-201 against the same polarization-scrambled input.
S1:0.132, S2: -0.548,
S3: 0.826 [Track]
CTR
L
Tracking on
Polarization control
