Fake fiber bare fiber disc single multimode OTDR test extension cable length can be customized

Using an optical time domain reflectometer (OTDR) to measure optical fiber, optical fiber link will encounter a very short case. When measuring short fiber links will often get a larger attenuation value (xxdB / km). Attenuation index can not get a good evaluation and assessment. Why is this? What method you can get a better test result? Due to the shorter fiber link (generally less than 1km), OTDR measured curve has some volatility, these tiny fluctuations impact the final numerical calculation. Parameter Description OTDR technology, there are indicators of a linear degree, the general OTDR this indicator is 0.05dB / dB (E6000C: 0.05dB / dB; N3900A: 0.03dB / dB), in fact, this indicator is described OTDR the fluctuation range of the curve. So for short fiber OTDR measurement accuracy is to be challenged. This issue is currently the common problems faced by OTDR, then the method used to reduce this impact? 1, adding 2km false test fiber. Due to join the 2km false test fiber, the fiber length is growth, this impact will be reduced. Should be able to get a satisfactory result. However, due to the increased length, also introduces measurement error, this method still has an error caused by a certain test methods. But as the quality of the test data verification project is drawing considerable value. 2, light source, optical power meter to measure the link loss, measure length with OTDR. Due to the use of the light source, optical power meter to measure the link loss close to the standard loss measurement method, so the loss of measurement accuracy is improved. Of course, for short fiber as the use of higher levels of precision optical power meter resolution, in order to reduce errors. Length measurements obtained using the OTDR. With the loss of value can be obtained by dividing the length of the value per unit length attenuation values. 3, OTDR measurement curve only as a reference, OTDR measurement focus is to exclude links obstacles. Short fiber measurement, OTDR measurement curve best only as a reference, as a qualitative basis, rather than as a quantitative basis. OTDR more tasks for the processing chain of obstacles, such as how to connect the quality of the connector, weld quality of welding points, slightly curved fiber optic detectors and other content.