What is the most common test method for measuring fiber optic loss?

The most common test method for measuring fiber optic loss is insertion loss testing. This method involves measuring the power levels entering and exiting a fiber optic link to determine the amount of light lost as it travels through the fiber.

Insertion loss testing provides a direct measurement of the loss incurred due to the fiber itself, connectors, splices, and other components of the fiber optic system. By quantifying this loss, technicians can assess the overall performance of the fiber optic installation and ensure it meets industry standards.

While other methods like OTDR (Optical Time Domain Reflectometer) testing and power meter testing can also be used for measuring fiber losses, insertion loss testing is particularly well-suited for characterizing the total loss of the entire link, making it the preferred choice in many situations. Visual inspection of fiber can help identify physical faults or issues but does not quantify loss measurement. As a result, insertion loss testing stands out as the definitive approach for assessing fiber optic link performance.