Fiber Bragg grating (FBG) is an important optical passive device and widely used in optical fiber communication
system. The application of normal organic polymer coating FBG used in some area is limited because of its easy
annealing and aging at high temperature. Employing chemical methods, we obtain certain thickness of uniform and
compact surface silver layer by controlling etching conditions and reaction time. Since the interference of the external
stress, the experiment result shows that the sensitivity of temperature keeps good linear response characteristic in the
meanwhile. It is proved that FBG with metal silver coating effectively improved the characteristic in its sensing area.
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