  The paper reports on the coupling of Parity-Time (PT)-symmetric whispering
gallery resonators with realistic material and gain/loss models. Response of
the PT system is analyzed for the case of low and high material and gain
dispersion, and also for two practical scenarios when the pump frequency is not
aligned with the resonant frequency of the desired whispering gallery mode and
when there is imbalance in the gain/loss profile. The results show that the
presence of dispersion and frequency misalignment causes skewness in frequency
bifurcation and significant reduction of the PT breaking point, respectively.
Finally, as coupled WGM resonators are inherently lossy structures, we show
that unbalancing the gain/loss in resonators is required to compensate for
inherent loss of the structure and achieve improved PT properties.
