What can affect the accuracy of an OTDR measurement?

The accuracy of an OTDR (Optical Time Domain Reflectometer) measurement can indeed be significantly influenced by pulse width settings. Pulse width refers to the duration of the light pulse that the OTDR sends into the fiber. Adjusting this setting can affect the resolution and sensitivity of the measurements. Narrower pulse widths can provide higher resolution and allow for better identification of events and faults in the optical fiber, particularly over shorter distances. However, this can also result in reduced dynamic range, where weaker signals might be lost in the noise.

Conversely, a wider pulse width increases the dynamic range and is more effective for longer distances or more substantial losses, but this can come at the cost of lower resolution which may obscure smaller faults. Hence, selecting the appropriate pulse width is essential to enhance the effectiveness and accuracy of the OTDR measurement, aligning with the specific characteristics of the fiber under test.