Versiv Series Cabling Certification Product Family
Technical Reference Handbook
228
The Core zone is the optical fiber. This area typically has a
diameter of 9 μm for singlemode fiber or 50 μm or 62.5 μm
for multimode fiber.
The Cladding zone is the area between the inner, green ring
and the Core zone. The cladding is a layer of reflective
material around the core that keeps the optical signal in the
core.
The Adhesive zone is the ring of epoxy or glue that attaches
the cladding to the ferrule. This is the zone between the two
green rings on the FiberInspector image. The middle of this
area has a diameter of 125 μm, which is the diameter of the
ferrule. Standards for endface analysis do not specify limits
for scratches or defects in the adhesive zone, so defects and
scratches in this area do not affect the PASS/FAIL result.
The Contact zone is the area on the ferrule that touches the
other fiber when you make a connection. The blue ring
around the Contact zone has a diameter of 250 μm for all
limits.
GPU177.EPS
Figure 100. Zones on a Fiber Endface
Contact zone
Adhesive zone
Cladding zone
Core zone
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