Methods to Improve fault locating accuracy of optical fiber lines

Methods to Improve fault locating accuracy of optical fiber lines

The continuous development of the economy is driving the constant upgrading of the information age. The transmission rate and capacity of copper cables cannot meet people's needs. Therefore, the optical cable market has ushered in unprecedented development. Nowadays, with the support of national policies, optical fiber cable lines are laid and used in large quantities, and technologies related to optical fiber communication have been paid attention, its reliability and security have also attracted more and more attention. The data shows that about 2/3 of optical fiber communication interruptions are mainly caused by Optical Fiber line faults.

In optical fiber communication, if the optical fiber is interrupted, we should first consider the optical cable fault and take some positioning measures for it. First, check the external network and then transmit it to the transmission system. External devices such as optical fiber breakage and power interruption are then tested. Therefore, how to improve the fault locating accuracy of optical cable lines helps to accurately determine the fault point. The following describes how to improve the fault locating accuracy of optical cable lines.

First, you need to know how to use the instrument and how to use the instrument, which is helpful for accurate measurement.

1. Set the OTDR parameters. When you use OTDR for testing, you must first set the meter parameters, the most important of which is to set the refractive index and testing wavelength of the optical fiber. Only by accurately setting basic parameters of the test instrument can we create conditions for accurate testing.

2. Use the zoom-in function of the instrument. The OTDR zoom-in function can be used to accurately set the cursor to the corresponding inflection point. The zoom-in function key can be used to zoom in the image to 25 meters/cell, in this way, the test results with a resolution less than 1 meter can be obtained.

3. Adjust the accurate test range. For different test range files, the Distance resolution of the OTDR test is different. When measuring optical fiber barrier points, select a Test Range file that is later than the tested distance and closest, in this way, the accuracy of the instrument can be fully utilized for measurement.

Second, accurate and complete original documents should be established during maintenance and management. These accurately completed optical cable line files are the basic basis for fault measurement and positioning. Therefore, the maintenance and management process should be neglected, and authentic, credible, and complete line information should be established.

During optical connection monitoring, the cumulative length of the optical fiber from the test end to the position of each joint point and the total attenuation value of the optical fiber trunk segment are recorded, at the same time, the model of the testing instrument and the set value of the refractive index during the testing are also registered. Accurately records the remaining optical cables. The length and length of the optical fiber tray of each connecting pit, special location, S-shaped laying, and entry room are recorded in detail, so that the length of the optical fiber tray can be deducted when the fault point routing length is converted.

In addition, the consistency of test conditions should be maintained during the measurement process. During obstacle testing, we should try our best to ensure the consistency of the testing instrument model, operation method, and meter parameter settings so that the testing results can be comparable. Therefore, the model and parameter settings of each test instrument must be recorded in detail for future use.

Finally, comprehensive analysis. The testing of obstacle points requires the operator to have a clear idea and a flexible way to solve the problem. The logic thinking is clear and can be used everywhere. Under normal circumstances, the two ends of the optical fiber-optic cable are tested for two-way fault, and then analyzed based on the original data to determine 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 of nearby joint to excavate at the obstacle point of the preliminary test, the end station test instrument is in the real-time measurement status.