A signal-to-noise ratio control device and method for an optical fiber perimeter security protection system

Abstract

The invention provides an SNR (signal to noise ratio) control device and method for an optical fiber perimeter safety protection system. The device comprises a signal generator, signal balancers, polarization state controllers, photoelectric detectors and a signal processing controller; and the signal generator is connected with the signal balancers, the signal balancers are connected with the polarization state controllers, the polarization state controllers are connected with the photoelectric detectors, the photoelectric detectors are connected with the signal processing controller, and the signal processing controller is connected with the signal balancers and the polarization state controllers. The signal balancers, the polarization state controllers and the signal processing controller are disposed, and the signal processing controller is connected with the signal balancers and the polarization state controllers, so balances of two paths of optical signals can be adjusted, polarization states of the two paths of the optical signals can be adjusted, the anti-polarization fading capability of the system can be effectively improved, optical path output visibility is stabilized, the SNR (signal to noise ratio) of the optical fiber perimeter safety protection system is improved, and system positioning precision is improved.

Description

technical field [0001] The invention relates to the technical field of security equipment, in particular to a signal-to-noise ratio control device and method for an optical fiber perimeter security protection system. Background technique [0002] In recent years, with the development of the national economy, it is more and more important to protect some important places, such as financial institutions, airports, and military bases. According to statistics, half of the threats received by these places are caused by security monitoring loopholes. In addition to being unaffected by natural conditions such as weather and terrain, the security system in these places must be able to make timely adjustments with the expansion of the scope of security and the modernization of criminal methods. [0003] Guaranteeing the safe transportation of oil and gas pipelines is an important responsibility of the relevant state departments. However, with the increase of oil and gas pipelines in...

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Problems solved by technology

[0007] In practical applications, due to the extremely high sensitivity of the Mach-Zehnder fiber optic interferometer to the surrounding environment, in the long-distance Mach-Zehnder fiber optic sensing, there is a factor that limits the application of the sensor - polarization fading

In the long-distance optical path system, the external stress will inevitably cause the fiber to bend and twist, which will cause the change of the polarization state of the laser in the fiber. In addition, the uneven distribution of environmental factors such as the temperature around the fiber will also cause the light in the fiber. The change of polarization state makes the signal-to-noise ratio of the fiber optic perimeter security protection system low

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