Multi-channel optical cable security early warning system based on wavelength division multiplexing

Abstract

The invention relates to a multi-channel optical cable security early warning system based on wavelength division multiplexing, comprising a wide spectrum light source, a fiber interference module, afirst wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexer, sensing optical cables, mirrors, a photodetector, a data acquisition card, anda signal processing terminal, wherein the wide spectrum light source is connected to the fiber interference module, and the fiber interference module is respectively connected to the first wavelengthdivision multiplexer, the second wavelength division multiplexer and the third wavelength division multiplexer; the first wavelength division multiplexer is respectively connected to a plurality of sensing optical cables, and the end of each sensing optical cable is provided with the mirror; the second wavelength division multiplexer and the third wavelength division multiplexer are connected tothe photodetector respectively, and the photodetector is connected to the signal processing terminal via the data acquisition card. The invention creates to use only one wide spectrum light source andone fiber interference module to simultaneously perform security early warning on multiple optical cables, sense the external intrusion behavior for the optical cable through the optical cable, and accurately identify and locate the location where there is a threat for optical cable information security. Moreover, intelligent alarm, without consuming too many resources, has lower cost.

Description

technical field [0001] The invention relates to the technical field of safety monitoring, in particular to a multi-channel optical cable safety early warning system based on wavelength division multiplexing. Background technique [0002] Optical fiber communication is the main way of global information transmission, from the backbone communication system including eight vertical and eight horizontal backbone networks, to various short-distance wired communication fields such as a large number of local area networks, smart office networks, and fiber optics to the home (FTTP), In recent years, the development speed, scale and application fields of optical fiber communication have attracted people's attention. At present, in the field of communication, optical cables undertake the main task of information transmission. Once there are hidden dangers in the link of optical cables, it will directly threaten network security and cause serious information security problems. In fact,...

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Problems solved by technology

In modern optical fiber communication, although various encryption and monitoring measures have been used, there are still information theft and intrusion events, and the damage to the line cannot be avoided. Therefore, it is necessary to monitor the dynamic behavior and line integrity around the optical fiber line and predict the occurrence of faults. , is an urgent problem to be solved to ensure the reliability of optical communication systems, but compared with my country's large-scale optical fiber communication construction, the development of optical fiber communication security technology with early warning and prevention functions is seriously lagging behind

Chinese invention patent specification CN102496231A discloses a long-distance main line safety fiber optic wavelength division multiplexing early warning system, which consists of an optical path and a signal processing module for collecting optical path signals. The optical path includes two equal optical path interferometers and a Michelson Interferometer, the above three interferometers use three different wavelengths to be transmitted to one optical fiber through a wavelength division multiplexer to form a sensing optical fiber; three light sources emit lasers with three different wavelengths as optical signals, and the above three interference The instrument senses the vibration signal, divides the vibration signal into three channels through the wavelength division multiplexer, and transmits the three signals to the photodiode respectively. The signal processing module processes the vibration signal collected by the photodiode, determines the location of the abnormal disturbance, and sends out an alarm signal. The circuit is complicated, it needs to occupy more resources, and the cost is high

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