We investigated the reflection of light caused by sharp bends in optical fi
ber experimentally. The position distribution of reflection power was measu
red using an OTDR and an OLCR. We found that: the reflection power increase
d linearly as the logarithm of the bending loss increased, which agrees wit
h expectation from a simple theoretical model. We believe that the light we
observed was part of the leaked light, which was reflected between the pri
mary and secondary coatings.