【摘 要】
：
A simple distributed optical fiber sensing system used to monitor vibration signal has an additional sub-loop coupled with main ring by a 3 dB coupler. This pap
【机 构】
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School of Optical Electronical Engineering. Chongqing University,School of Computer Science and Info
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A simple distributed optical fiber sensing system used to monitor vibration signal has an additional sub-loop coupled with main ring by a 3 dB coupler. This paper compares three outputting interfered beams, each of them travels in the sub-ring 0, 1, 2 times, separately. Using the simultaneous equations produced by those three outputs, we find the relation between the interference lights and vibration signals characteristics, such as frequency, amplitude and position. Through simplifying and calculating, the vibration position can be obtained finally.
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