本論文利用光纖麥克森干涉儀為基礎設計一入侵感測系統，並於干涉儀內架設一線型雷射共振腔，再利用多個DWDM設定波長藉此對應不同之防區，經由入侵引起之相位變化造成干涉，即可偵測入侵訊號。本文使用了四個波長做為四防區，並於戶外測試了光纜貼地、光纜埋地、光纜放置於鐵網及鐵窗等環境下之入侵狀況，利用程式分析各種入侵訊號後判別出不同環境下對應之閾值，再統一測試系統之報警狀況，並同時監控防區間之干擾狀況，以達到最佳之系統判斷。

Fiber laser cavities with Michelson interferometers being used as end reflectors were employed to produce laser power fluctuation when the Michelson interferometers were perturbed. In this research, we built such fiber laser cavities and applied them to intrusion detection for multiple perimeter zone security. Two single-mode fibers were used to implement such a fiber laser cavity with a DWDM bandpass filter to define the perimeter zone. When there is anyone invading the defense zone, the phase of the Michelson interferometer will change and then we can receive the intrusion signal fedback from the corresponding laser cavity. In this thesis, we use four wavelengths for four defense zones and we test our system in four environments including cable on the ground, cable buried in the ground, cable on the iron net, and cable on the window. In order to make the best judgement in determining intrusion, we analyze different intrusion-induced signals, determine threshold by program, simultaneously test the false alarm rate for all the defense-zones, and detect interference between different defense zones.

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