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Table of Contents
{ Abstract / Résumé }
Chapter 1
Chapter 2
Chapter 3
Chapter 4
5.1.1 : Axial stress effect on fiber Bragg gratings
5.1.2 : Experiment description
5.1.3 : OLCR measurements
Ph.D.  /  { Web Version }  /  Chapter 5  /  5.1  /  5.1.4 : Spectral responses
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Chapter 6
Chapter 7
Chapter 8
Appendix
Other parts
{ 5.2 }
5.3
5.1.5 : Reconstruction of the complex coupling coefficient
5.1.6 : Finite element simulations
5.1.7 : Conclusion

5.1         Axial strain field distribution measurements

5.1.4        Spectral responses

Fig. 5-9 Spectral intensity response calculated from the OLCR response (solid lines) and directly measured with a tunable laser (circles); the wavelength difference origin corresponds to the average Bragg wavelength lmc(F)

The Fig. 5-9 presents the spectral intensity response obtained for various loading forces (0 N corresponds to the measurement after the loading process and the relaxation rest). The wavelength difference is calculated from the average Bragg wavelength lmc(F). A very good agreement is observed between the spectral responses calculated from the OLCR data and measured with a tunable laser. The maximal reflectivity is two third smaller at 384 N than without load, while at the same time, the spectral range is broadened by factor of 3.5.



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