Dynamic interrogation of long period gratings with modulated fibre Bragg gratings

J. P. Carvalho; L. Coelho; L. Correia; O. Frazão; P. A. S. Jorge; J. M. Baptista; I. Dias; J. L. Santos; J. Weyl; M. J. Pontes; M. A. Martinez; A. P. Barbero; R. M. Ribeiro; A. J. G. Abelém; M. T. R. Giraldi

doi:10.1117/12.866444

8 September 2010 Dynamic interrogation of long period gratings with modulated fibre Bragg gratings

J. P. Carvalho, L. Coelho, L. Correia, O. Frazão, P. A. S. Jorge, J. M. Baptista, I. Dias, J. L. Santos, J. Weyl, M. J. Pontes, M. A. Martinez, A. P. Barbero, R. M. Ribeiro, A. J. G. Abelém, M. T. R. Giraldi

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Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 76532C (2010) https://doi.org/10.1117/12.866444
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal

Abstract

It is reported a LPG dynamic interrogation technique based on the modulation of fibre Bragg gratings located in the readout unit that permits to attenuate the effect of the 1/f noise of the electronics in the resolution of the LPG-based sensing head. The concept is tested to detect variations of the external refractive index and a resolution of 2.0×10^-4 NIR was achieved without system optimization. Additionally, the effect in the sensor resolution when introducing Erbium and Raman optical amplification is experimentally investigated.

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J. P. Carvalho, L. Coelho, L. Correia, O. Frazão, P. A. S. Jorge, J. M. Baptista, I. Dias, J. L. Santos, J. Weyl, M. J. Pontes, M. A. Martinez, A. P. Barbero, R. M. Ribeiro, A. J. G. Abelém, and M. T. R. Giraldi "Dynamic interrogation of long period gratings with modulated fibre Bragg gratings", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76532C (8 September 2010); https://doi.org/10.1117/12.866444

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