OTDR device and measurement method based on physical random code correlation detection

Abstract

The invention relates to a distributed optical fiber positioning system, in particular to an OTDR device and measurement method based on physical random code correlation detection, which solves the contradiction that the dynamic range and spatial resolution of the traditional OTDR system cannot be improved simultaneously. The device of the present invention includes a physical random code generator, a microwave amplifier, a DFB laser, an electro-optical phase modulator, an optical isolator, a first optical amplifier, a 1×2 fiber coupler, a variable optical delay line, a first photodetector, and an oscilloscope , an optical fiber to be tested, an optical circulator, a second optical amplifier, a second photodetector, and a computer. The system structure of the present invention is simple, easy to operate, low in cost, and the spatial resolution is determined by the code width of the physical random code, which not only avoids the problem of deterioration of the spatial resolution caused by the weak period of the chaotic laser signal, but also improves the accuracy of the high spatial resolution acquisition. Adjustment is also very convenient.

Description

technical field [0001] The invention is applied to the field of optical fiber detection, relates to a distributed optical fiber positioning system, and is specifically an OTDR device and measurement method based on physical random code correlation detection, which can realize long-distance, high spatial resolution breakpoint or loss measurement. Background technique [0002] At present, optical fiber is mainly used in the field of communication, and as a physical layer transmission medium, the transmission characteristics of optical fiber play a decisive role in communication distance, information capacity and transmission speed. As modern society relies more and more on optical fiber communication technology, incidents of massive losses due to fiber optic cable failures also occur frequently. Therefore, how to quickly and accurately find the specific location and attenuation information of the fault in the optical fiber cable is of great significance in the process of produ...

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Problems solved by technology

[0010] The purpose of the present invention is to provide an OTDR device and measurement method based on physical random code correlation detection, which is used to solve the defects that the traditional OTDR spatial resolution and measurement distance cannot be improved at the same time, and the defects of several improved method systems are complicated, and the design An OTDR device and measurement method for physical random code correlation detection with high spatial resolution, large dynamic range, and simple structure

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