Abstract: This patent describes an approach to Optical Time-Domain Reflectometer (OTDR) calibration which depends on different levels of backscatter internally produced by the different pulsewidths available to the OTDR. The different pulsewidths available on the OTDR were used to produce traces with different backscatter levels (also called injection levels). The height difference between those levels and the level of the measurement pulsewidth was recorded and matched with the computed Return Loss associated to the pulsewidths length difference. A calibration curve is produced using multiple calibration points.

Abstract: This patent describes an approach to Optical Time-Domain Reflectometer (OTDR) calibration which depends on different levels of backscatter internally produced by the different pulsewidths available to the OTDR. The different pulsewidths available on the OTDR were used to produce traces with different backscatter levels (also called injection levels). The height difference between those levels and the level of the measurement pulsewidth was recorded and matched with the computed Return Loss associated to the pulsewidths length difference. A calibration curve is produced using multiple calibration points.