Completion of the test used in a fiber-optic connectors to measure joint quality.
Should be tested in accordance with IEC 1073-1. Measurements in the laboratory or the field. Cut back to the laboratory method is better, the scene can be bi-directional OTDR method. Typical insertion loss values may vary depending on the application and (or) change the method used. Typical minimum splice loss ≤ 0.1dB. In some cases, the insertion loss ≤ 0.5dB typical value is probably acceptable. There are many welding machines and mechanical equipment in the production of splice connector splice loss can be estimated after the value. Some authorities and private institutions in the field continue to run the installation using these estimates, and in all line construction is completed, OTDR and then retest the whole of the line. On-site installation, other methods can also be used to estimate the splice loss values, such as using the power meter and clip up the local injection detection method.
(1) The proposal is acceptable based on the value of single fiber splice loss ≤ 0.5dB, there is no requirement in the case mean in terms of.
Welding machine from the current situation, welding machine the data displayed with the observation section of fiber optic connectors, fiber optic splice point can be roughly estimated loss of status, but not accurate to the current requirements of China's optical fiber splice loss of the indicators of magnitude. We believe that these welding machines are designed and based on ITU recommendations.
(2) continuation of the current welding machine is through the optical X-axis and Y-axis direction of the dislocation adjustment, the most hours in the dislocation axis welding, this method can adjust the axis of the core look into the method called, this method is different from the power detection, on-site splice loss can not know the exact value. However, in continuation of the adjustment axis and the welding process, through the camera to detect the state of the core fusion welding machine dedicated to the program, you can continue to calculate the value after the loss. But it only shows the extent of fiber axis aligned, the fiber itself does not contain the inherent characteristics of the loss affected. And is the OTDR backscatter test method, which includes the formation of reflective optical parameters of different losses.
Comparing the two test theory, the two are very different. Proved through practice, two ways to measure the consistency of the data is poor, in recent years through the continuation of Route testing found that in many cases show loss of a small welding machine (less than 0.05dB) or even zero, but the OTDR test is than 0.08dB, and did not find a corresponding law.
Japan's loss of the standard connector (NTT fiber construction inspection procedures) is less than the minimum 0.9dB, no mean requirement, only hop total attenuation requirements, if met, will be able to open or future design requirements of additional equipment, in the follow- operational aspects of the line with ITU recommendations. United States, European countries have adopted a largely consistent approach with ITU recommendations.
In fact, the main impact of the safety cable is mechanical damage, larger optical fiber splice loss does not affect the continuation of strength, so when we found in the acceptance testing, and some point the value is indeed too large, about 1% of the joint return that exceed the standard , and can not be reduced after several follow in this case, also can be judged qualified. sometimes will follow the intermediate segment to the total attenuation