Which instrument is used to identify signal loss caused by dirty connectors in fiber optic systems?

Which instrument is used to identify signal loss caused by dirty connectors in fiber optic systems?

• A. Light Meter
• B. OTDR
• C. Cable Tester
• D. TDR

Answer: (A)

Measuring optical power directly reveals insertion loss caused by dirty connectors. A light meter (optical power meter) is used with a known light source to determine how much signal actually reaches the end of the link. If a connector is dirty, it introduces extra loss at the interface, causing the measured power to drop. Cleaning the connectors and rechecking should bring the power back up, confirming that dirty connectors were the source of the loss. If you needed to map where along the fiber the loss occurs, an OTDR would be used, but for quickly identifying dirty-connector loss, the power-meter approach is the most straightforward. The other instruments serve different purposes: OTDR analyzes reflections and location of faults along the span, TDR is used for time-domain reflections in cables, and a general cable tester isn’t focused on fiber insertion loss.

Measuring optical power directly reveals insertion loss caused by dirty connectors. A light meter (optical power meter) is used with a known light source to determine how much signal actually reaches the end of the link. If a connector is dirty, it introduces extra loss at the interface, causing the measured power to drop. Cleaning the connectors and rechecking should bring the power back up, confirming that dirty connectors were the source of the loss. If you needed to map where along the fiber the loss occurs, an OTDR would be used, but for quickly identifying dirty-connector loss, the power-meter approach is the most straightforward. The other instruments serve different purposes: OTDR analyzes reflections and location of faults along the span, TDR is used for time-domain reflections in cables, and a general cable tester isn’t focused on fiber insertion loss.