EXFO PSO-200 Optical Modulation Analyzer - Manual (Page 269)

Measurement Definitions
Optical Modulation Analyzer 261
Measurements for Eye Diagrams
Extinction Ratio
The extinction ratio (ER) of an eye diagram is only defined for NRZ (OOK)
signals and is the ratio between the one level and the zero level in
magnitude. It is defined as:
Eye Amplitude
The eye amplitude (EA) is defined as the difference between the one and
zero levels according to:
given in percent to the highest level in the eye diagram.
Eye Height
The eye height (EH) measures the vertical opening of an eye diagram and
is defined as:
Eye-Opening Factor
The eye-opening factor is a measurement of the vertical eye opening
according to:
ER
E
one
E
dark
–
E
zero
E
dark
–
--------------------------------
 
 
=
EA E
one
E
zero
– =
EH E
one
3 
one
–   E
zero
3 
zero
+   – =
EOF
E
one

one
–   E
zero

zero
+   –
E
one
E
zero
–
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