Tektronix OM4006D, User Manual

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Operating basics
Table 8: OUI plots (real-time oscilloscopes) (cont.)
Plot Description
BER is shown by physical tributary and in total. Color changes on synch loss.
2d Poincaré shows the position of the data signal polarizations relative to the receiver’s H
(1, 2) and V (3, 4).
3d Poincaré shows polarization of each symbol-center value. Click and drag to rotate
the sphere.
The Decision-Threshold Q-Factor is an ideal signal quality measurement based on
measured BER values. The horizontal axis corresponds to the vertical axis on the
corresponding coherent eye plot. Linear Q is on the left and BER on the right of the plot.
Measured values are indicated by squares: blue for 1’s red for 0’s.
OM4000D Series Coherent Lightwave Signal Analyzer 27