Fabrication Technology And Sensor Applications Of Fiber Bragg Grating

Fiber Bragg grating (FBG) was first discovered by K.O.Hill in 1978. Originally, researchers thought that it was only a new phenomenon and since then suitable manufacturing techniques and application areas had not been found before several techniques emerged, which enabled the huge production and broad applications of various FBGs. The first is the side-writing technique proposed by G. Meltz, et al. This method makes it possible to manufacture FBG with different wavelengths by holography. And the second one is hydrogen load technique. It makes that one can inscribe FBG on conventional fiber. And the phase mask is another important technique. These three techniques bring about the commercialization of FBGs. FBG is compatible with communications optical fibers and therefore has many applications, for example, in optical fiber communications, they can be used as WDM filters, dispersion compensators, EDFA GFF (gain flattened filters), and fiber laser, etc.