Fiber Bragg gratings (FBG) are now recognized as very important
optoelectronic components for guided-wave optics owing to the large
number of device functions they can facilitate [1]. They are of widespread
use either in telecommunications, in instrumentation and sensors for the
measurement of strain, temperature and hydrostatic pressure [2] as well
as many other measurands (i.e. magnetic fields [3, 4]) via appropriate
transducing mechanisms [5] and have unique advantages over classical
electrical strain gauges (e.g. in smart structures).