Abstract
We propose a method to evaluate the splicing quality for few-mode fibers. A fusion fault detection system for few-mode fiber has been constructed, using OTDR technology, combined with photon lanterns as a multiplexer and a demultiplexer. Every single spatial mode is launched into the few-mode fiber under test through the mode coupler, and the power loss of each mode at the fiber fusion splice is estimated by the Rayleigh backscattering light power of the mixed mode and the single mode. The experimental results indicate that it is necessary to evaluate accurately the splicing quality of a few-mode fiber by all modes that can be transmitted in the fiber under test, rather than by a single mode.
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