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Effective index drift from molecular hydrogen diffusion in hydrogen-loaded optical fibres and its effect on Bragg grating fabrication

Effective index drift from molecular hydrogen diffusion in hydrogen-loaded optical fibres and its effect on Bragg grating fabrication

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When hydrogen loading is used to enhance the photosensitivity of silica-based optical waveguides and fibres, the presence of molecular hydrogen dissolved in the glass matrix changes the effective index of propagation of guided optical modes by as much as 0.05%. Real-time monitoring of the reflectivity spectrum of Bragg gratings written in such conditions shows that the centre wavelength follows the changes in hydrogen concentration due to diffusion and reaction with glass defects.

Inspec keywords: reflectivity; hydrogen; diffusion in solids; holographic gratings; optical fibres

Other keywords: effective index drift; glass defects; photosensitivity; hydrogen-loaded optical fibres; silica-based optical waveguides; Bragg grating fabrication; guided optical modes; glass matrix; reflectivity spectrum; centre wavelength; molecular hydrogen diffusion; reaction; real-time monitoring; 1533 to 1536 nm

Subjects: Other fibre optical devices and techniques; Fibre optics; Holography; Gratings, echelles; Holographic recording

References

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