  We exploit balancing the complex optical energy between scattering and
guiding states at contrived exceptional points of degeneracy in order to form
an active waveguide without utilizing an active medium. This study reports
peculiar engineering of first-order dispersion on a pseudo-Hermitian
Hamiltonian system in which distributed Bragg grating tracks 0^th order of
scattering phase-shift. This is owing to the EDPs instigated by means of 1D
perturbing PT-symmetries in a planar photonic crystal. The coalescence of Bloch
eigenstates occurs due to reverse amalgamation of modulated two-terminal
optical component whose gain and loss parameters depends on the direction of
the light path. Then, we employed a 1D binary superlattice around a defect that
undergoes both states, physical equilibrium (in the bound layer) and
non-equilibrium (in unbound layer), in chronological order. Then, recoupling
optical energy to the underlying bound region compromises scattering
phase-shift in each sequence. This achievement is not only broadening the
understanding of revolutionized quantum mechanics but also benefits
technological principles of steering localization with high Q-factors that are
in huge demands of designing low-threshold switching, optical tweezers, lasing
and various types of optical elements in photonic integrated circuits.
