Knowledge Base - Solution

Negative Loss on OTDR

Tuesday, December 31, 2019
Submitted by ryan.grace on July 8, 2021 - 5:48pm
Problem: 
What causes negative loss on an event on my OTDR results?
Solution: 
Negative loss is caused by the joining of two fibers with different backscatter coeffecients. A higher backscatter coefficient, on the second half of the connection, causes an increase in the back scatter on the other side of the event rather than the normal decrease resulting in what appears to be a negative loss. 

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