EXFO PSO-100 Series Optical Sampling Oscilloscopes User Manual
Page 129
Asynchronous Sampling Principle
Optical Sampling Oscilloscope
121
Frequency Holes
The samples are evenly distributed, but sometimes the samples could be
unevenly distributed.
In rare cases, the samples could originate from just a few points in the eye
diagram.
We call this phenomenon frequency holes, since there are certain distinct
offsets between the signal frequency and the sample frequency that give
rise to this effect. Since both the signal frequency and the sampling
frequency drifts slightly with time, this effect may come and go in a random
manner.
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