Pi-shifted fiber Bragg grating ring resonator as a splitting mode resonant sensor |
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| Carlo Edoardo Campanella, Lorenzo Mastronardi, Francesco De Leonardis, Vittorio M.N. Passaro |
- Abstract:
- In this paper we report on a splitting mode resonant sensor based on a ring cavity formed by closing on itself a pi-shifted fiber Bragg grating. In particular, this cavity allows to obtain a spectral response characterized by a splitting mode structure, composed by both symmetric and antisymmetric resonances. The modal splitting occurs very close to the Bragg wavelength, where the pi-shifted fiber Bragg grating shows its transmission resonant maximum. In this region, for particular index modulation depths of the fiber Bragg grating, the linewidth of the two antysimmetrical modes suffers of an opposite behaviour because the symmetrical resonance linewidth is enlarged while the antisymmetrical resonance linewidth is reduced. Thus, we demonstrate that, near the Bragg wavelength, the splitting magnitude only depends on the index modulation depth of the fiber Bragg grating and it is independent from the device length. In this way, being the splitting magnitude insensitive to the length variations associated to any external perturbation, the proposed device can be used for those sensing applications requiring a sensing mechanism immune to the environmental noise sources.
- Keywords:
- optical resonators; Bragg grating; coupled resonators; optical sensors
- Download:
- IMEKO-TC4-2014-515.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- TC4 Symposium 2014
- Title:
20th IMEKO TC4 Symposium on Measurements of Electrical Quantities (together with 18th TC4 International Workshop on ADC and DCA Modeling and Testing, IWADC)
"Research on Electrical and Electronic Measurement for the Economic Upturn"- Place:
- Benevento, ITALY
- Time:
- 15 September 2014 - 17 September 2014