Correlation between optical fibre diameter and characteristics of tilted fibre Bragg grating-assisted sensors

We report the results of a study on the influence of the fibre cladding diameter on the accuracy and resolution of tilted fibre Bragg grating-assisted refractometers. Tilted fibre Bragg gratings are an essential element used to develop high-precision fibre sensors for environmental monitoring. Comparative research was performed using one of comprehensive processing algorithms employing spectral envelope analysis. It was shown that the sensor accuracy decreases with decreasign fibre cladding diameter. At the same time, an increase in the diameter deteriorates the spectral pattern contrast, thus impeding the development of high-efficiency sensor elements.