EXFO PSO-200 Optical Modulation Analyzer - Manual (Page 272)

Measurement Definitions
264 PSO-200
Measurements for Eye Diagrams
Timing Jitter
The timing jitter of an eye diagram is a measurement of the variance in
time locations of the crossing point. Horizontal time histograms are
constructed, and the histogram having the smallest variance determines
the crossing point. The standard deviation of this histogram determines the
RMS timing jitter and the extreme points (largest and smallest time values)
in the histogram determine the peak-to-peak timing jitter.
Timing jitter is applied to the magnitude of the signal.
Peak-to-peak Peak-to-peak
Magnit
ude
In-p
hase/Quad
rature ph
ase