Abstract
A new method of shifting in phase of optical heterodyne detection for humidity sensing have been proposed and demonstrated. In this paper, optical heterodyne techniques by using single source with single Fiber Brag Grating (FBG) were designed and studied. In this work FBG has been used as a light source and sensing element at the same time. FBG used as a laser source to achieve heterodyne detection through combine its reflected light with main laser source. Furthermore a combined lights was generated a beat frequency (F_B). The simulation results proved the ability of the proposed technique to achieve the requires sensitivity about 0.142 GHz / %RH.
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