Since the 1970s, optical fibers have undergone considerable development and are now used in a very wide range of applications, covering telecommunications, environment, medical applications, etc., thanks to the development of amplifiers, lasers and sensors. Such progress has been made possible by the considerable work carried out to improve the transparency of optical fibers. In recent years, a new family of optical fibers has been developed incorporating nanoparticles. Such fibers were first envisaged as a means of locally modifying the chemical environment of luminescent ions (rare-earth and transition metal ions) in order to offer new lasers. However, the light scattering induced by nanoparticles limits this application. More recently, light scattering has instead been exploited to develop sensors (temperature, stress, chemistry, biology, etc.). This presentation will review these fibers, presenting the fabrication processes, the fundamental issues involved in nanoparticles formation and their different applications.
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