Chapter 1 Outline
1-44
Pmin: Minimum power measured in the waveform
VECP (Vertical Eye Closure Penalty)
VECP is the ratio of eye amplitude to eye opening and is calculated by the
following formula.
VECP =
)
A
OMA
log(10
0
(dB)
: Optical Modulation Amplitude
0
: Vertical Eye Opening
The histogram is measured at the center point between the cross points
on the time axis. (OMA)
The upper and lower limits of the vertical eye opening are measured. (A
0
)
Figure 1.5-28 VECP Measurement
Zero Level
At Eye pattern measurement, the maximum level at the center 20% of the
bit interval is the average value of the low histogram.
OMA
A
0
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