1. Simple judgment of fiber quality: Under normal circumstances, the slope of the main body of the light curve (single disk or several optical cables) tested by OTDR is basically the same. If the slope of a certain section is large, it indicates that the attenuation of this section is large; if the main body of the curve is of irregular shape, the slope fluctuation is large. Bending or arcing indicates that the quality of the optical fiber is seriously degraded and does not meet the communication requirements.
2. Wavelength selection and unidirectional and bidirectional test: The 1550 wavelength test distance is farther, 1550nm is more sensitive to bending than 1310nm fiber, 1550nm is less attenuation per unit length than 1310nm, and the fusion or connector loss measured at 1310nm is higher than 1550nm. In actual fiber optic cable maintenance work, both wavelengths are generally tested and compared. Both the positive gain phenomenon and the line exceeding the distance must be subjected to two-way test analysis and calculation to obtain a good test conclusion.
3. Joint cleaning: Before connecting the fiber optic connector to the OTDR, it must be carefully cleaned, including the OTDR output connector and the tested live connector. Otherwise, the insertion loss is too large, the measurement is unreliable, the curve is noisy or even the measurement cannot be performed, it may also damage the OTDR. Avoid using other cleaning agents or refractive index matching fluids other than alcohol, because they can dissolve the adhesive in the optical fiber connector.
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