DFB laser based electrical dynamic interrogation for optical fiber sensors

J. P. Carvalho; O. Frazão; J. M. Baptista; J. L. Santos; A. P. Barbero

doi:10.1117/12.922691

9 May 2012 DFB laser based electrical dynamic interrogation for optical fiber sensors

J. P. Carvalho, O. Frazão, J. M. Baptista, J. L. Santos, A. P. Barbero

Proceedings Volume 8439, Optical Sensing and Detection II; 84390K (2012) https://doi.org/10.1117/12.922691
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

An electrical dynamic interrogation technique previously reported by the authors for long-period grating sensors is now progressed by relying its operation exclusively on the modulation of a DFB Laser. The analysis of the detected first and second harmonic generated by the electrical modulation of the DFB Laser allows generating an optical signal proportional to the LPG spectral shift and resilient to optical power fluctuations along the system. This concept permits attenuating the effect of the 1/f noise of the photodetection, amplification and processing electronics on the sensing head resolution. This technique is employed in a multiplexing sensing scheme that measures refractive index variations.

Citation Download Citation

J. P. Carvalho, O. Frazão, J. M. Baptista, J. L. Santos, and A. P. Barbero "DFB laser based electrical dynamic interrogation for optical fiber sensors", Proc. SPIE 8439, Optical Sensing and Detection II, 84390K (9 May 2012); https://doi.org/10.1117/12.922691

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