The insertion losses of the fiber splices are much less than the Fresnel reflection loss at a butted fiber joint.

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The insertion losses of fiber splices are typically very low, often less than 0.1 dB, because they are designed to align the fibers precisely for minimal signal loss. In contrast, Fresnel reflection losses at a butted fiber joint without index matching can be significantly higher, often around 4% (about 0.2 dB) per interface, due to the mismatch in refractive indices at the air-gap interface.

The Insertion Losses of the Fiber Splices Are Much Less