Which device is used to locate faults by emitting a bright visible light along the fiber?

Which device is used to locate faults by emitting a bright visible light along the fiber?

• A. VFL
• B. BFL
• C. Inspection scope
• D. OTDR

Answer: (A)

Visual Fault Locator is used to locate faults by emitting bright visible light along the fiber. When you connect it to the fiber and switch it on, you look for where the light travels or where it stops. If light travels cleanly to the far end, the fiber is continuous; if it stops, leaks out, or is blocked at a point, that spot points to a fault such as a break or a bad splice. This quick visual check is exactly what this tool is designed for. Other instruments serve different purposes: an OTDR sends pulses and analyzes reflections to map faults along the fiber with distance, which is more complex; an inspection scope is meant for checking connector end faces, not tracing light along the length; and the remaining option isn’t the standard tool for this visual fault finding.

Visual Fault Locator is used to locate faults by emitting bright visible light along the fiber. When you connect it to the fiber and switch it on, you look for where the light travels or where it stops. If light travels cleanly to the far end, the fiber is continuous; if it stops, leaks out, or is blocked at a point, that spot points to a fault such as a break or a bad splice. This quick visual check is exactly what this tool is designed for. Other instruments serve different purposes: an OTDR sends pulses and analyzes reflections to map faults along the fiber with distance, which is more complex; an inspection scope is meant for checking connector end faces, not tracing light along the length; and the remaining option isn’t the standard tool for this visual fault finding.