Control of the Bragg wavelength in fibre Bragg grating writing process using the phase mask method

The paper specifies the achievable Bragg wave shift generated by pre-stressing the optical fibre in the phase mask writing process. The maximum possible shift results from the mechanical strength of the optical fibre to axial stress. Two methods are also proposed for the production of Bragg gratings with a controlled Bragg wavelength. The experiment was performed for the SMF28 fibre subjected to the hydrogenation process. The FBG fabrication was carried out in the excimer laser system using the phase mask method.

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