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Hardware: Optical Frequency Domain Reflectometer Problem: How do I get an accurate fiber length measurement with the OFDR? Solution: In order to get the ultimate in accuracy in a DUT length measurement with an OFDR, you should measure in reflection and attach a short patch cord between the DUT and OFDR source port. Then measure the difference between the reflection at the connection to the DUT and the reflection at the end of the DUT. See Figure 1 below which shows the red and yellow cursors marking the patch cord and end of DUT. The length is shown as dX. Note: This relative measurement of distance will be accurate to the spatial resolution of the instrument and to the degree of accuracy in the group index used to convert optical delay to length.
Figure 1: DUT length is shown as the distance (dX) between the two cursors. In this example, it's 5.027m.
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