Mitigate jitter discrepancies
Martin Rowe, Senior Technical Editor -- Test & Measurement World, 3/1/2004
If you've ever measured jitter on the same data stream with more than one instrument and found different results, you're not alone. Why? Because every jitter-measuring instrument uses a different technique.
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Measure the jitter in your test equipment and subtract it from jitter measurements to find your system's jitter. |
Recent changes to ITU-T Recommendation O.172—which will appear in the next revision as an appendix—specify a "gold standard" method for characterizing an optical tester's intrinsic jitter (Ref. 1). The method requires a reference optical-data signal with a known, negligible jitter. You'll also need an optical transmitter to convert the data stream of the electrical signal to the optical domain. After measuring the tester's intrinsic jitter, you can apply a calibration procedure to remove your instrument's jitter from DUT measurements.
For more information on this topic, download a paper written by Ronnie Neil of Agilent Technologies at www.tmworld.com/intrinsic_jitter.
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