Abstract
This article deals with coupling efficiency and reflectance analysis of
graded-index expanded-beam connectors. We point out the best conditions to take
advantage of expanded beam connectors for relaxing lateral offset tolerances without
going down to critical angle misalignments tolerances. The influence of manufacturing
defaults and coupling misalignments by lateral offset and tilt angle on coupling
efficiency and reflectance are theoretically analyzed, investigated, and compared to
experimental results. The study explains an interesting reflectance of expanded beam
connectors compared to standard single-mode fibers. We demonstrate and explain why we
can both obtain high coupling efficiency and low reflectance.
© 2016 IEEE
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