Fiber Bragg Grating (FBG) is one of the most potential and typical optical passive components at present.

传感器是目前最有发展前途、最具代表性的光纤无源器件之一。

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They are new type of passive optical components, which are based on the periodical distribution of refraction index in fiber core.

它是利用光纤材料的光敏特性在光纤的纤芯上建立的一种空间周期性折射率分布，其作用在于改变或控制光在该区域的传播行为方式。

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