To verify the continuity of the optical fibers,

Continuity check

To verify the continuity of the optical fibers, a visual continuity plotter, a visual fault locator or an optical loss test device (OLTS) must be used. Trace the fiber from point to point through any interconnection to ensure that the fiber path is properly installed and that the polarization and routing are correct and documented. 

Insertion losses

Insertion losses refer to the optical losses of the installed fibers when tested with an optical loss test equipment (OLTS). It is better to test multimode cables using Method B of TIA / EIA 526-14 (always document the method used) and single-mode cables using TIA / EIA 526-7.   

Test multimode fibers at 850 and 1300 nm and single-mode fibers at 1310 and 1550 nm, unless the standards or the customer require other values. 

Test the reference cables before the test to verify the quality and clean them frequently. 
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Those cables that will be used with high-speed systems and laser sources must be tested with suitable laser sources to ensure their operation with this type of source.