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PPM-350 Series Measurement Techniques

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PPM-350 Series Measurement Techniques

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  • Author: Daniel Gariépy, Vincent Racine
The PPM-350 PON Power Meter Series (PPM-350B/PPM-350C) is specially designed to measure all passive optical network (PON) signals (downstream and upstream) and to provide the pass/fail status. This application note explores some key elements and measurement techniques specifi c to PON that are used by the PPM350 Series to obtain the most accurate results. The pass-through method is the only way to concurrently measure the upstream (one signal) and downstream (one or two signals) transmissions. Since the optical network terminal (ONT) in a PON only transmits when it receives the request from the optical line terminal (OLT), the ONT’s transmitter shuts down as soon as the ONT is disconnected.

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