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How to improve the accuracy of optical cable line fault location?

by:AAA     2020-03-12
With the continuous development of the optical fiber and cable market, optical fiber and cable lines are laid and used in large quantities. In this process, its reliability and safety have attracted more and more attention. Relevant data show that about 2/3 of the main reason for the interruption of optical fiber communication is the failure of optical cable lines. At the moment, how to improve the accuracy of optical cable line fault location has become a key problem to be solved in optical fiber communication. First of all, understand how to use the instrument, master the use of the instrument, help to accurately measure. 1. Set the parameters of OTDR. When using OTDR test, instrument parameter setting must be carried out first, the most important of which is to set the refractive index and test wavelength of the test fiber. Only by accurately setting the basic parameters of the test instrument can conditions be created for accurate testing. 2. Use the amplification function of the instrument. Using the amplification function of OTDR, the cursor can be accurately set at the corresponding inflection point, and the graphic can be enlarged to 25 MiG by using the amplification function key, in this way, more accurate test results with a resolution of less than 1 m can be obtained. 3. Adjust the accurate test range file. For different test range files, the distance resolution of OTDR test is different. When measuring the optical fiber barrier point, the test range file that is larger than the measured distance and the nearest one should be selected, in this way, the accuracy of the instrument itself can be fully utilized for measurement. Secondly, in the process of maintenance and management, accurate and completed original documents should be established. These accurately completed optical cable line files are the basic basis for fault measurement and location. Therefore, in the process of maintenance and management, we should not be careless, and we should establish true, credible and complete line data. When monitoring the connection of optical cables, record the cumulative length of optical fibers from the test end to each joint point and the total attenuation value of optical fibers in the trunk section, at the same time, the model of the test instrument and the set value of the refractive index during the test are also registered. Accurately record the remaining of various optical cables. Record in detail the length of the optical cable tray in each joint pit, special section, S-shaped laying, room entry, etc. and the length of the optical fiber tray in the joint box, terminal box, ODF frame, etc. , so as to deduct them when converting the route length of the fault point. In addition, the consistency of test conditions should be maintained during the measurement process. The consistency of the test instrument model, operation method and instrument parameter setting should be ensured as much as possible during the obstacle test, so that such test results can be comparable. Therefore, each time the model of the test instrument, the setting of the test parameters should be recorded in detail, so that it can be used later. Finally, comprehensive analysis. The test of the obstacle point requires the operator to have a clear idea and a flexible way to deal with the problem. The logical thinking is very useful wherever it is. In general, the two ends of the fiber optic cable line are tested for two-way faults, and then analyzed in combination with the original data, and then prepared to judge the specific location of the fault. When the link around the fault point has no obvious characteristics and the specific site cannot be determined, we can adopt the measurement method at the nearest joint and excavate at the obstacle point of the preliminary test, the end station test instrument is in real-time measurement state. In optical fiber communication, if we encounter optical fiber interruption, we first consider the optical cable failure and take certain positioning measures, first check the outside and then transmit. External such as: broken fiber, power supply interruption, etc. and then test the transmission equipment. Therefore, how to improve the accuracy of optical cable line fault location is helpful to accurately judge the fault point.
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