RS-232 command notes:
1.
Only one command is allowed in each command string.
2.
The POS-002 will respond to a command with either the requested data,
formatted as described in Table 2, or with one of the response codes listed in
Table 3. While the POS-002 is processing a command and sending back a
response ASCII code, any additional commands sent by the computer will be
ignored.
Basic Operation and Control Parameter Definitions:
A POS-002 using the maximum search algorithm tunes the output state of polarization
(SOP) to maximize a feedback signal. This can be an internal reference (POS-002-I) or a
0-5V analog electrical feedback signal provided by the user (POS-002-E). Each time it
runs through its control cycle, the POS-002 checks the feedback signal and, if necessary,
makes a polarization adjustment.
Figure 7 POS-002 response to discontinuous change in input polarization state
(using default control settings and fixed step size mode)
Figure 7 shows the response of the POS-002 to a single discontinuous change in the input
polarization state, using the default control parameter settings. The red line is the input
polarization, and the blue line is the POS-002 output. The POS-002 compensates for the
input polarization change via a series of small polarization steps.
The labeled quantities on the graph are as follows:
A: Step time: With settings delay = 0, AD Avg. = 1, each step takes 26µs.
B: Step size: At step size = 8, the angle change per step
≈
1.76
°
on the Poincaré
sphere.
C: Output signal fluctuation: The active SOP searching causes a baseline level of
fluctuation around the target SOP.
Document #: GP-UM-POS-002-21
Page 16 of 30
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