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<p><b>New page</b></p><div>== Summary ==<br />
Structure of Fiber Bragg Gratings (FBGs). 1) a uniform FBG, where the refractive index change has a fixed period, <math>\Lambda</math>. 2) a chirped FBG, where the refractive index change is graded to give a larger bandwidth, <math>\Delta\lambda</math>. 3) a tilted FBG, where the change in refractive index occurs are an angle to the optical axis of the fiber. 4) a superstructure FBG.<br />
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