During testing & commissioning of fiber optics cable you might encounter unexplained or unexpected higher fiber loss. You have done your best in getting the lowest possible fiber jointing loss, you took proper and extra care during fiber installation by avoiding micro & macro bending and pulling cable with minimum force and yet you still encounter unexplained fiber optic cable loss.
The first thing you should do is to make sure that your fiber optics test equipment is properly set up. The second thing that you should take note is to have a clean fiber optics ferrule end surface. During installation your fiber optics connectors might exposed to dusty environment or you forget to use cap to cover your connector ferrule.
You could use either cotton with 99.99% Isoprophy alcohol to clean the end surface of fiber optics ferrule or following easy to use fiber cleaning method.
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