Grating writing in structured optical fibers

Abstract

Grating writing in structured optical fibers is reviewed. Various laser sources have been used including UV and near IR nanosecond and femtosecond lasers, each enabling different material processing regimes. The issue of scattering is modeled through simulation and compared with experiment. Good agreement has been established.

Fibre Bragg Gratings in Embedded Microstructured Optical Fibres Allow Distinguishing between Symmetric and Anti-Symmetric Lamb Waves in Carbon Fibre Reinforced Composites

“…More specifically, the design flexibility of such microstructured fibres (MOFs) allows for the development of sensors that exhibit selective sensitivities to e.g., axial strain, transverse strain, or even shear strain, whilst being negligibly cross-sensitive to temperature changes. Examples of MOF-based sensors have been reviewed in several research papers [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. In this paper, we use a specific microstructured fibre design which we refer to as a ‘butterfly’ MOF [ 17 , 18 , 19 , 20 ].…”

Long period fiber gratings written in photonic crystal fibers by use of CO2 laser

“…Optical fiber gratings already play a vital role in the field of the optical communications and sensors. There are two types of in-fiber gratings: fiber Bragg gratings (FBGs) with periodicities of the order of the optical wavelength [1,2] and long period fiber gratings (LPFGs) with periodicities of several hundred wavelengths [3][4][5][6][7]. Various fabrication methods, such as UV laser exposure [3], CO 2 laser irradiation [4,[8][9][10][11], electric arc discharge [12], femtosecond laser exposure [13], mechanical microbend [14], and etched corrugation [15], have been demonstrated to write LPFGs in different types of optical fibers.…”