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Chapter 5: The Visual Fault Locator
Visual Fault Locator Applications
The CertiFiber Pro modules include a visual fault locator that
sends a red light down the fiber. The red light shows at the end of
the fiber and at breaks, cracks, and sharp bends along the fiber.
The VFL also helps you quickly verify the continuity of fibers,
identify connectors, and find faults along fibers and in
connectors.
The VFL helps you do these tasks:
 Quickly verify the continuity of fibers.
 Identify the polarity of duplex connections.
 Identify connections in patch panels.
 See breaks and bad splices. These faults cause the fiber to
emit red light.
 See high-loss bends. If you can see the light from the VFL
at a bend in a fiber, the bend is too sharp.
 See connectors that have damaged fibers inside. A
damaged fiber inside a connector causes a red light in the
connector.
 Increase the quality of mechanical splices and pre-
polished connectors: Before you seal the splice or
connector, adjust the fiber alignment for the minimum
amount of light where the fibers touch. (Refer to the
instructions from the manufacturer when you make
splices and connectors.)