![]() If somewhere there is a non-reflective fault (splice, kink), then the reflectometer level of the reflected signal before the fault will be higher than after it – and a step is formed on the graph. The fiber itself, due to Rayleigh scattering, reflects back a little and analyzing the power of the reverse reflection and the time, at which this instantaneous power came, the OTDR puts dots on the axial plane, connecting them into a graph. In general, the graph is descending, because everything in the fiber optic line introduces attenuation into the sent signal: all kinds of connections, defects, and the fiber itself also has constant attenuation.Īn OTDR trace is made as follows: a reflectometer sends a short pulse of light (its duration is set in the settings) to the line, and then records to what is reflected back. The X-axis shows the distance, the Y-axis is the signal power level. So, what can you read from the trace when you open it on the device or on the computer? ![]() ![]() If you made measurements and obtained the attenuation for the entire line of 0.66 dB and the length of your line is 3 km, then the kilometric attention will be 0.66 / 3 = 0.22 dB / km. Kilometric attenuation is attenuation per unit length. trc, or other format file containing a graph with the data about the measured duct.Īttenuation is a characteristic showing how much power (dB or dBm) is lost at a given location (attenuation at splice, cross) or in a given section of the duct. ![]()
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