Method for accurately positioning fault points of optical cables

Abstract

The invention provides a method for accurately positioning fault points of optical cables. The method comprises the following steps: an optical time domain reflectometer is provided; the refracting index of the optical time domain reflectometer is adjusted to be in accordance with that of a tested optical fiber; the optical time domain reflectometer is utilized to accurately measure the relative distance between a fault point and an adjacent joint point, which is defined as the fiber length S1 of the optical fiber, and the surface length Lp of the optical fiber is calculated out according to the fiber length S1 of the optical fiber; and the surface length size Ly of the fault point of the optical fiber is calculated out according to the surface length Lp of the optical fiber. By adopting the method provided by the invention, test errors caused by the reasons, such as inaccurate engineering data, refractivity deviation between an instrument and the optical fiber, and the like, are reduced, long-distance check computation of the length of the optical cable is avoided, the test results are more accurate, and the method is proved to be simple and effective in practical application.

Description

【Technical field】 [0001] The invention relates to a positioning method, in particular to a precise positioning method of an optical cable fault point. 【Background technique】 [0002] With the diversified development of urban communication, people's demand for transmission bandwidth is getting higher and higher. Copper cable has gradually withdrawn from the communication stage, while optical cable has large information capacity, long transmission distance, low price, good anti-interference and confidentiality, etc. Advantages, it has become an irreplaceable means of line transmission and is widely used in the field of communication. Until now, the momentum of optical cable construction is still unabated and has gradually entered thousands of households. However, due to the extensive laying and use of optical cables and the dependence of users on optical fiber communication systems, the safety and reliability of optical fiber communication systems have attracted more and more...

AI Technical Summary

Problems solved by technology

However, due to the complex direction of the optical cable line, the distance position expressed by the optical time domain reflectometer is far from the real position of the obstacle point, because (1) the twists and turns of the optical cable route and the redundancy of the optical cable in the well along the line; (2) the optical fiber in the optical cable memory In the shrinkage ratio, the length of the tested optical fiber is greater than the length of the cable sheath; (3) the deviation of the refractive index causes the test error. For the above reasons, the longer the distance of the tested optical fiber, the greater the accumulated error, so that the measured data can only be used as a reference. It cannot be the reference basis for cable repair