The “Scan Setting” block on the lower left of the screen is used to configure the
operational parameters for the scan.
The scan mode pull-down menu allows the user to choose between a continuous or step
scan. In a continuous scan, the PMDPro uses the smallest possible DGD step size (0.1 ps)
to generate the trace, and the user can select the rate of change of DGD, in ps/s. In a step
scan, the PMDPro generates a series of points placed along the trace, with user-selectable
DGD step size and dwell time at each point. The transient between any two consecutive
points on a trace still follows the trace, however, so either the continuous or step scan can
be used for applications that require continuous PMD variation.
The step direction pull-down menu selects the direction of travel along the trace. If “UP”
is selected, the PMDPro starts at the lower DGD limit point (whether designated as start
or end point) and traverses the trace to the other limit point. If “DOWN” is selected, the
PMDPro starts at the higher DGD limit point and traverses the trace to the lower DGD
limit point.
Document #: GP-UM-PMD-1000-21
Page 74 of 122
