The time-domain optical reflectometer (OTDR)

OTDR tests

The time-domain optical reflectometer (OTDR) uses techniques such as a radar to create a fiber drawing of a fiber optic cable installation. The drawing, called signature or layout, contains the information about the fiber length, the losses in the fiber segments, in the connectors, in the splices and the losses caused due to the tension during the installation. OTDRs are used to verify the quality of the installation or to solve problems. However, tests with OTDR should not be used to determine cable losses.   

OTDRs have limited resolution based on distance and may show undesirable results when testing short cables, characteristic of internal plant installations. If you want to perform an OTDR test in the wiring of internal plant facilities, experienced personnel should assess whether it is appropriate. 

OTDR tests should only be performed by trained personnel, using certified equipment designed for it. The technicians who carry out the tests must be trained, not only in the handling of the OTDR but also in the interpretation of the OTDR paths. 

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