Novel Type II Bragg Grating Structures in Silica Fibers Using Femtosecond Lasers and Phase Masks

This review paper presents recent developments on the fabrication of novel thermally stable Type II fiber Bragg grating structures using femtosecond lasers and the phase mask technique. By manipulating the inscription beam and phase mask designs, exotic grating structures, such as ultrashort gratings <100 μm in length, Fabry-Perot structures or π-phase shifted structures can be created that are stable at high temperatures. These novel structures can also be created directly through protective polymer coatings such as polyimide, thus simplifying their manufacture.

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