What does "end face inspection" involve?

End face inspection is a critical process in fiber optics installation and maintenance that focuses on closely examining the surface of fiber optic connectors. This examination is essential to ensure optimal performance of the fiber optic system. The main purpose of end face inspection is to identify any contamination, scratches, or other surface defects that could degrade the signal quality or cause connection issues.

When connectors are being used in a fiber optic system, any dirt, dust, oil, or scratches on the connector end face can lead to increased attenuation (signal loss) or reflection, potentially disrupting the communication signals. By inspecting the end face before connecting two fibers, technicians can ensure that they are working with clean and undamaged connectors, which is crucial for maintaining the integrity of the optical signal.

The other options presented in the question focus on different aspects of fiber optics. Measuring the bend radius of fiber cables is important for preventing damage to the fibers but does not relate directly to the condition of the connector's end face. Checking the compatibility of connectors is also essential for ensuring proper mating between connecting devices, but it does not involve inspecting the actual surface quality of those connectors. Testing the signal strength of connections is critical as well; however, this is a subsequent step that comes after the physical condition of the components