Figure 13 shows the response of the POS-002, using a delay setting of 50, to the same
discontinuous change in the input polarization state used in Figure 7. It can be seen that
the time per step, and thus the cumulative response time, is longer. Figure 11 and 12
provide a closeup comparison of the response time with different delay settings.
-
Command: *AVG xx#
During each control loop cycle, the POS-002 performs one adjustment (step) to the
polarization control voltage, checks the AD feedback once and compares it with a
reference value to decide its action for the next cycle. For an external feedback model,
the quality of the feedback signal is the limiting factor in device performance. Any noise
in the feedback signal will be read as input polarization change and will therefore result
in output polarization fluctuation.
The AD average number defines the number of AD samples averaged to obtain the
feedback signal value used for one control loop cycle. Increasing the AD average number
can improve the stability if the feedback signal is noisy. For example, setting AD avg. = 2
converts a 50mV, 10KHz noise component in the feedback signal to a 25mV, 5KHz noise
component.
Increasing the AD average number also increases the control loop cycle time by the
amount specified in the table.
Figure 14 shows the response of the POS-002, using a larger AD average than the default
setting, to the same discontinuous change in the input polarization state used in Figure 7.
The output polarization fluctuation (labeled C in Figure 7) is much smaller than in Figure
7.
Figure 14 POS-002 response to discontinuous change in input polarization state
(AD average larger than default setting)
Document #: GP-UM-POS-002-21
Page 20 of 30
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