Temperature response of an all-solid photonic bandgap fiber for sensing applications

Abstract

The spectral shift due to temperature in the photonic bandgap (PBG) of an all-solid PBG fiber is investigated, aiming at discrete and distributed temperature sensing. A temperature rise induces a red shift in the bandgap spectra, which can be easily and precisely monitored by measuring the fiber transmission near one of the band edges. Two different situations that are potentially compatible with distributed and quasi-distributed sensing were investigated: heating a 2 m section of a longer (~10 m) fiber, and heating the whole extension of a fiber that is tens of centimeters in length and was spliced to conventional fibers on both sides. The latter setup yielded bandgap spectral shifts up to ~35 pm/°C. Aiming at discrete sensing, a short (~50 mm) fiber section was subjected to a tight bend so as to exhibit increased temperature sensitivity. Choosing the position of the bend allows for reconfiguration, on demand, of the sensor. A semi-analytical method to identify the spectral position of bandgaps was used to model the fiber transmission, as well as the bandgap shift with temperature, with consistent results.

Effect of submicron deformations on the transmission of all-solid photonic bandgap fibre

“…The core region corresponds to a defect in the centre of the periodic structure (Argyros et al, 2005)]. The waveguiding properties of PBF give great potential for the use of PBF in, for example, nonlinear fibre optics (Vanvincq et al, 2012), optical sensing (de Oliveira et al, 2013) and wavelength filtering (Yan et al, 2010). Solid-core PBF is much less sensitive to bending than a step-index singlemode fibre (Ren et al, 2013).…”

Design of Single-Band Bandpass Filter Using Photonic Bandgap Fiber by Suppressing Core Modes in Higher Order Bandgaps

“…Numerous efforts have been carried out to manipulate the bandgaps of PBGF for various applications [10], [11], [12], [13], [14], [15]. The photonic bandgaps of the PBGFs have been used to reduce Raman scattering [16], [17], higher order mode suppression [18] and filtering out the amplified spontaneous emission in lasers and fiber amplifiers [19], [20], [21].…”