Effect of spectrum broadening on photon-counting fiber Bragg grating sensing

Abstract

In a photon-counting fiber Bragg grating (FBG) sensing system, a shorter probe pulse width reaches a higher spatial resolution, which inevitably causes a spectrum broadening according to the Fourier transform theory, thus affecting the sensitivity of the sensing system. In this work, we investigate the effect of spectrum broadening on a photon-counting FBG sensing system with a dual-wavelength differential detection method. A theoretical model is developed, and a proof-of-principle experimental demonstration is realized. Our results give a numerical relationship between the sensitivity and spatial resolution at the different spectral widths of FBG. In our experiment, for a commercial FBG with a spectral width of 0.6 nm, an optimal spatial resolution of 3 mm and a corresponding sensitivity of 2.03 nm−1 can be achieved.

Optoelectronic Devices for Quantum Information Processing

“…We focused our research on Geiger-mode avalanche photodiodes (single-photon avalanche diodes [68,69], negative feedback avalanche diodes [70]) and the application of the two-dimensional (2D) materials for photonlevel detectors [71]. Moreover, we have proposed fiber Bragg grating sensing system by utilizing single-photon detectors [72,73]. Optoelectronic Devices for Quantum Information Processing DOI: http://dx.doi.org/10.5772/intechopen.1002676…”

“…In Ref. [73], we have investigated the effect of spectrum broadening on a photon-counting FBG sensing system with a DWDD method. We built a theoretical model and characterized the photon-counting FBG sensing systems at different spatial resolutions.…”

“…Figure 13.Experimental setup of high spatial resolution DWDD. From ref [73]. (reuse with approved CC BY license).…”

Anapole assisted self-hybridized exciton–polaritons in perovskite metasurfaces

“…Recently, self-coupling using perovskite nanoparticle arrays, perovskite grating, and perovskite nanoparticles with the aid of multipolar Mie resonance modes has been reported. 27,30,[37][38][39][40][41][42][43] However, multipolar Mie resonances with large field enhancements, especially the anapole mode, can hardly be excited in perovskite nanostructures with low-index dielectrics, and it is still a challenge to achieve a large field confined within the perovskite metasurface and further to achieve self-hybridization with perovskite excitons.…”