Dynamics of an optoelectronic oscillator have been studied. The main stable dynamical regimes have been established. Evolution of the phase portrait of the system was studied as well. Bifurcation analysis has been carried out to substantiate observed evolution of the phase space structure. It is shown that the system is multistable. Multistability is formed by combinations of periodic and quasi-periodic regimes.
We investigate complex dynamics of two coupled nonidentical Land-Kobayashi oscillators. It is shown that at low values of feedback rate variation of delay only leads to alternation of periodic and stationary regimes. The analysis of characteristic regimes of the system in a wide range of parameters is provided. We demonstrate that the system under study is multistable. With the variation of control parameters sole fixed point repeatedly undergoes supercritical Andronov-Hopf bifurcations, which leads to an increase in the number of limit cycles co-existing in the phase space. It is shown that multistable states are formed by different combinations of the periodic, quasi-periodic and chaotic regimes.
We present the numerical study of terahertz generation via different frequency mixing in two-wavelength vertical
external cavity surface emitting laser. Nonlinear crystal is placed inside the resonator to increase terahertz
radiation power. The dynamical model is based on modified Lang-Kobayashi equations. Numerical simulation
through varying round trip time in the external cavity and feedback rate is presented.