The most important application of optical fibers is undoubtedly in optical communications.
Optical fibers can be used as sensors as well, if we look at how certain parameters of propagation are affected by external perturbations. This is a very interesting niche from both the scientific and technical points of view.
In applications other than sensors, we strive for getting rid of external perturbations and make the fiber as immune as possible. In sensors, we need to make the sensitivity reproducible, and eventually try to increase it. Because we are interested in its measurement, we now call the physical perturbation a measurand.
In Optical Fiber Sensors (OFSs), the effect of a measurand may eventually be very ...