Method and device for improving echo signal of chaotic optical time domain reflectometer

Abstract

The invention belongs to the technical field of optical time domain reflectometers, and discloses a method and a device for improving the echo signal of a chaotic optical time domain reflectometer, wherein the device is used to realize the method, and the method includes the following steps: S1 , Based on a fiber coupler, the light source signal from the feedback laser is divided into two channels, one is connected to the mirror, and the other is directly output to form a chaotic laser source signal; based on another fiber coupler, the chaotic laser source signal is divided into two channels , one output forms a coherent coupled light source signal, and the other output forms a chaotic detection light source signal; the present invention can effectively improve the echo power of the chaotic optical time domain reflectometer based on the coherent coupling enhancement technology, thereby improving the measurement effect of the chaotic optical time domain reflectometer , so that the present invention can realize the detection of the fault point of the optical fiber more accurately, and also has the advantage of low cost.

Description

technical field [0001] The invention belongs to the technical field of optical time domain reflectometers, and in particular relates to a method and a device for improving the echo signal of a chaotic optical time domain reflectometer. Background technique [0002] Optical time domain reflectometer is currently the main measuring instrument for diagnosing fault points of optical fiber links. This equipment uses the pulse flight method measurement technology. It has a simple structure and mature method, but it cannot improve the measurement accuracy and increase the Measure distance. This is because it has irreconcilable contradictions in principle. If you want to increase the farthest distance of the measurement, you must either increase the pulse power or increase the pulse width. Too high pulse optical power will not only increase the measurement cost, but also lead to the loss of the fiber. irreversible damage, and increasing the pulse width will reduce the accuracy of t...

AI Technical Summary

Problems solved by technology

[0004] However, with the application of chaotic optical time domain reflectometer, it is found in practice that the detection signal will be attenuated when propagating in the optical fiber, and the measured echo signal is very small. If the echo signal is too small, the measurement result will be seriously disturbed

At present, there are two main ways to improve the echo signal: one is to increase the power of the transmitted signal, too high power requires a high-power laser, and the other is to increase the sensitivity of the photodetector, but both methods will Increased cost of measurement

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