Operator’s Manual
45
Measurements
Measurements allow you to access key metrics of interest in tabular form. When turned on, OMA
measurements appear immediately below the display grid. Each measurement can be enabled/disabled
separately. Up-to-12 measurements can be enabled at once.
Touch the Parameters button, then select from the Measurements and Meas. PolDeMux subdialogs.
Parameters
These commonly used optical parameters can be measured on OMA traces. See Appendix 3: OMA
Measurement Definitions on p.66 for information about how measurements are calculated.
NOTE: The PMD parameter is enabled only when the number of taps is set to greater than 1 in the Pol
Demux setting.
Measurement
Shows
EVM
Magnitude of the error vector, which is the difference between the signal
vector and the ideal reference vector.
Q Factor
An alternate representation of the signal-to-noise ratio, presented in dB.
BER Estimate
An instantaneous estimation of the bit error rate calculated from the Q
Factor. A less time consuming alternative to actual bit counting.
I Bias Error
Center of the I component with reference to the ideal center point, presented
as a percentage.
Q Bias Error
Center of the Q component with reference to the ideal center point,
presented as a percentage.
IQ Quadrature Error
Phase error of the constellation points with respect to the ideal phase
relationship between the constellation points.
IQ Skew
Time difference between the in-phase and quadrature crossing points in the
eye diagrams.
IQ Skew C
Time difference between the in-phase and quadrature eyes based on their
center. This measurement method provides better results for higher density
modulation formats than the IQ Skew measurement above.
Summary of Contents for IQS25
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