Fibre Bragg Gratings (FBGs) have found widespread use in optical telecommunications. They improve the performance of pump lasers in optical amplifiers, act as filters for gain flattening or for highly selective channel selection in wavelength division multiplexing.
Over the last decade, an increasing shift has occurred from optical communication toward optical sensing as shown in figure 1. Driven by global demand for strain, pressure and temperature monitoring in civil engineering as well as energy production and transmission, fibre optic sensor systems have emerged as an enabling technology, overcoming many of the limitations of electrical sensors.
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