Optoelectronic system for measuring optical fiber interference signal

Abstract

The invention relates to an optoelectronic system for measuring an optical fiber interference signal. The scheme of the optoelectronic system is that the optoelectronic system comprises a laser source, two photoelectric detectors, three isolators, an optical fiber coupler and a sensing optical fiber, wherein the optical fiber coupler is a multi-port optical fiber coupler, more than or equal to two ports are arranged at each side, and more than two ports are arranged at one side at least; the laser source and the two photoelectric detectors are connected with the same side of the optical fiber coupler by the respective corresponding isolator respectively; and the two ends of the sensing optical fiber are respectively connected with the two ports at the other side of the optical fiber coupler to form an optical closed loop. According to the optoelectronic system, the problem that the interference signal is not enough in strength and is not stable due to the double refraction phenomenon generated randomly in the optical fiber in the traditional optical fiber interference system is solved. Through the mode, the optoelectronic system has the advantages that the interference signal is stable and is not affected by environmental factors.

Description

technical field [0001] The invention relates to optical fiber sensing technology, in particular to a photoelectric system for measuring optical fiber interference signals. Background technique [0002] The invention is mainly based on the principle of optical interference. In the optical fiber interference system, two beams of light from the same laser source propagating in forward and reverse directions form interference in the same optical fiber, that is, in an optical closed circuit. When the optical closed loop is disturbed by the outside world, the optical path along the positive and negative directions will be affected. Although the two beams are affected equally, the time it takes for this effect to reach the detector is different. The interference light intensity measured on the detector will be affected, causing a corresponding change in response. [0003] Taking the traditional optical closed loop interference ring as an example, such as figure 1 As shown, the ...

AI Technical Summary

Problems solved by technology

This will make the system unable to work stably and reliably

[0010] The above problems are unavoidable problems in all optical fiber systems that apply the interference principle; these factors will cause a series of problems such as instability of optical fiber interference signals, deterioration of signal-to-noise ratio, and increased false alarm rate and false alarm rate of the system.

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