  The unique spectral behavior exhibited by a class of non-uniform Bragg
periodic structures, namely chirped and apodized fiber Bragg gratings (FBGs)
influenced by parity and time reversal ($\mathcal{PT}$) symmetry, is presented.
The interplay between the $\mathcal{PT}$-symmetry and nonuniformities brings
exceptional functionalities in the broken $\mathcal{PT}$-symmetric phase such
as wavelength selective amplification and single-mode lasing for a wide range
of variations in gain-loss. We observe that the device is no more passive and
it undergoes a series of transitions from asymmetric reflection to
unidirectional invisibility and multi-mode amplification as a consequence of
variation in the imaginary part of the strength of modulation in different
apodization profiles, namely Gaussian and raised cosine, at the given value of
chirping. The chirping affords bandwidth control as well as control over the
magnitude of the reflected (transmitted) light. Likewise, apodization offers
additional functionality in the form of suppression of uncontrolled lasing
behavior in the broken $\mathcal{PT}$-symmetric regime besides moderating the
reflected signals outside the band edges of the spectra.
