Tektronix CSA8000B - Manual (Page 329)

Measurement Reference Parameters and Methods
CSA8000B & TDS8000B User Manual B- 67
The following measurement parameters are used when approximating Optical
Modulation Amplitude (OMA) on NRZ waveforms. As shown, OMA on NRZ
waveforms is determined from the means of histograms of the data from level 1
and level 0, taken on a vertical slice through the NRZ eye crossing. This method
gives an approximation of Optical Modulation Amplitude of an NRZ waveform;
Optical Modulations Amplitude measurements are primarily defined for Pulse
signals.
Vertical slice
P1 (histogram at logic high)
P1 (histogram at logic low)
Figure B- 13: NRZ Crossings (OMA)
NRZ Crossings (OMA)