Exfo FTB-5600 Distributed PMD Analyzer Bedienungsanleitung PDF herunterladen (Seite 124)

Acquisition Data

118 FTB-5600

In the FTB-5600, P-OTDR traces are acquired in pairs for two

closely-spaced optical frequencies, ν

±½δν with the same I/O-SOP. The

central frequency ν

of each pair is in general different than that of any

other pair. Although the I/O-SOP corresponding to traces within each pair

must be the same, they are generally different from one pair to another.

This overall process is shown in the figure below:

Note: Each P instance represents an OTDR trace.

In order to settle up an acquisition, you will note that since the acquisition

consist of OTDR traces, you must set the OTDR trace parameters such as

the range, pulse and number of averages. For the PMD part, you must set

the number of SOPs, the frequency range, and the frequency steps

(through the PMD scale and the residual PMD).

In the example above, each SOP is build from eight OTDR traces. If you

take another example of an acquisition of of 100 SOPs and 3 steps, plus the

intermediate data, would result in 2400 OTDR traces

(3stepsx8tracesx100SOPs).

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Exfo FTB-5600 Distributed PMD Analyzer Bedienungsanleitung Seite 124