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Singlemode Fibers
Now a little more about denubbing. You will note in the previously
described discussion and procedures for multimode fibers that care is
taken not to allow the coarser grit films to remove the fiber nub flush with
the ferrule surface. This serves two purposes: First, the best way to remove
deep scratches from the ferrule surface is not to put them in the first place.
If 5µm polish film is allowed to remove fiber/epoxy all the way to the
ferrule surface, then deep scratches can occur in the ferrule surface and
the fiber end will be severely pitted. The only way to remove the pits and
scratches is to begin reducing the ferrule surface along with the fiber. This
we do not want to do. It is time consuming, a wasteful exercise in materials
and we are in danger of altering the inherent ferrule geometry. Secondly,
and important to Singlemode polish procedure, is the effect that coarser
grit films can have on the cladding of the fiber itself.
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