Exfo PSO-200 Optical Modulation Analyzer Manual de usuario descargar pdf (Pagina 55)

Customizing the Graph and Data Layout

Optical Modulation Analyzer 47

Pattern Diagrams

You can view all graphs (I/Q, intensity, magnitude, phase and EVM) as a

pattern instead of an eye diagram. The pattern diagram is a continuous

curve between different amplitude and/or phase states, as a function of

time. It helps viewing the capacity of the system to transmit all signal

combinations.

In standard sampling oscilloscopes, a pattern clock (which sends out a

pulse synchronized with the periodic pattern) may be used to trigger the

scope. In contrast, the PSO-200 uses a software algorithm to reconstruct

the pattern.

On pattern diagrams, the X axis is either symbol- or time-based. At a 100 %

zoom value, you can see the entire signal for the symbol pattern.

Y-Axis Auto Scaling (All Graphs)

The unit does not display intensity data (Y axis) in mW, but rather scales it

to a normalized unit. Each time you press Start (or Clear Data), the unit

computes a scaling factor based on the first burst, and uses it for

subsequent bursts.

Note: To see the difference in intensity between the X and Y polarizations,

compare the Power Level values from both result tables. You can also see

the values in the constellation charts.

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Exfo PSO-200 Optical Modulation Analyzer Manual de usuario Pagina 55