We study the dynamic behavior and switching of optical pulses in the PT - symmetric structure with the additional periodic modulation of the Kerr nonlinearity. In such structure the change of a refractive index by an intense optical radiation causes the change of the PT - symmetry breaking threshold while the gain/loss value is constant. As the result the system can move from the full PT - symmetry state to the broken PT - symmetry or vice versa. It is shown that despite the self-pulsation instability these transitions can be observed in the switching of long enough optical pulses. Furthermore, such active structures allow to control the amplitude enhancement of the transmitted pulses.
The generation of broadband terahertz radiation by optical rectification in a gradient planar waveguide is investigated. The conditions for the capture of optical and terahertz pulses and collinear propagation of their bound states are studied. The waveguide structure significantly reduces the diffraction spreading of generated terahertz pulses in comparison to a homogeneous bulk medium.
The propagation of light pulses through the chirped Bragg structures with superimposed PT-symmetric complex potential (gain and loss) has been studied using the numerical methods. The reflective properties of such structures in the regime below PT-symmetry breaking threshold are discussed. It is shown, that due to the balanced amplification of different spectral components of a reflected pulse such structures can effectively transform the profile of a reflected pulse and at the same time amplify its amplitude.
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