Open AccessCoupled π ‐shifted fibre Bragg grating ring resonant strain sensors
Author(s) -
Campanella C.E.
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.2526
Subject(s) - fiber bragg grating , materials science , resonator , optics , grating , resonance (particle physics) , reflection (computer programming) , coupled mode theory , strain (injury) , optoelectronics , refractive index , physics , wavelength , atomic physics , medicine , computer science , programming language
Resonant optical strain sensors, obtained by closing in loop coupled π ‐shifted Bragg gratings ( π ‐FBGs), are reported. Despite of a conventional π ‐FBG, showing a transmission Lorentzian resonance in the reflection band, the coupled π ‐shifted Bragg grating structure is characterised by a spectral response formed by a split doublet of the primary transmission Lorentzian mode of π ‐FBG. By closing in loop this structure, the coupled π ‐shifted Bragg grating ring resonators show better performance than π ‐shifted Bragg grating ring resonators in terms of strain sensitivity (i.e. 2.86 pm/με) is demonstrated. Thus, the coupled π ‐FBGRR is suitable for enhanced sensitivity strain sensing applications.