Abstract: Fiber Bragg gratings (FBGs) are widely used as temperature and strain
measurement systems and in telecommunications systems. In order to
simplify detecting the wavelength change (which is the output signal from
FBB), fiber Bragg grating based optical wavelength discriminators can be
used. In this paper, discriminators with apodized, chirped FBG cooperating
with the identical grating of a sensor are considered. The analysis includes:
the processing range (assuming the nonlinearity characteristic is less than
1%), the processing equation and the range of strain measurement. On the
basis of simulation tests, there is discussed the influence of the following
parameters: chirp value (Subsection 3.1), length (Subsection 3.2) and
constant refractive index change averaged over the grating period
(Subsection 3.3) of selected FBGs on the discriminator characteristic.
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