  In this paper a practical case of a finite periodic Parity Time chain made of
resonant dielectric cylinders is considered. The paper analyzes a more general
case where PT symmetry is achieved by modulating both the real and imaginary
part of the material refractive index along the resonator chain. The
band-structure of the finite periodic PT resonator chains is compared to
infinite chains in order to understand the complex interdependence of the Bloch
phase and the amount of the gain/loss in the system that causes the PT symmetry
to break. The results show that the type of the modulation along the unit cell
can significantly affect the position of the threshold point of the PT system.
In all cases the lowest threshold is achieved near the end of the Brillouin
zone. In the case of finite PT-chains, and for a particular type of modulation,
early PT symmetry breaking is observed and shown to be caused by the presence
of termination states localized at the edges of the finite chain resulting in
localized lasing and dissipative modes at each end of the chain.
