Measuring Dark Voltage - JDS Uniphase SWS15100 User Manual

Figure 77: Setup for Zeroing for an FBG
2. Take a reference scan. This scan acquires the zero loss trace for the reflection path. Ensure
that the same channels, as were used for characterizing the FBG, are used.

Measuring Dark Voltage

Dark voltage is the residual power left in the system when there is no light going through the
system. The detectors generate a small current even when no light falls on them. This feature is
caused by current leakage through the detector and is created by background electrical noise,
temperature variations, and stray light. The resulting dark voltage can be measured and
compensated for during DUT characterization.
It is recommended that a dark voltage measurement be made every time the system is installed
in a new location. It establishes the noise floor for all SWS measurements.
Operating and Maintenance Instructions – 91
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