High temperature annealing behavior of femtosecond written FBGs in Ge-doped fused silica optical fibers

A. Lerner; T. Blanchet; R. Cotillard; M. Sosa; N. Roussel; G. Bouwmans; G. Laffont

doi:10.1117/12.2678399

23 May 2023 High temperature annealing behavior of femtosecond written FBGs in Ge-doped fused silica optical fibers

A. Lerner, T. Blanchet, R. Cotillard, M. Sosa, N. Roussel, G. Bouwmans, G. Laffont

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 1264331 (2023) https://doi.org/10.1117/12.2678399
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

We investigate the behavior and stability of fiber Bragg gratings written by femtosecond laser pulses in Ge-doped fused silica optical fibers, using both the phase mask and point-by-point techniques, during their annealing at 1200°C for 30 min and subsequent aging at 1000°C during 43 hours. Bragg wavelength drifts and reflected peak amplitude variations were shown to drastically differ depending on the writing scheme and thermal history. Particularly, we show that amplitude decay of point-by-point gratings at 1200°C may be easily mitigated by tuning the writing pulse energy. Future work may be pursued in order to finely unravel the high temperature mechanisms regarding the stability of fs-written fiber Bragg gratings used as temperature sensors in order to improve measurement stability and accuracy.

Citation Download Citation

A. Lerner, T. Blanchet, R. Cotillard, M. Sosa, N. Roussel, G. Bouwmans, and G. Laffont "High temperature annealing behavior of femtosecond written FBGs in Ge-doped fused silica optical fibers", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 1264331 (23 May 2023); https://doi.org/10.1117/12.2678399

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