Antiphase chaotic synchronization enhancement in a vertical cavity surface emitting laser

Abstract

In this paper, we demonstrate experimentally that a vertical cavity surface emitting laser (VCSEL) exhibits an enhancement of nonlinear polarization dynamics, i.e., antiphase chaos synchronization and mode hopping with optical feedback (OF). Rotating orthogonal polarization of a VCSEL is used as an external parameter to generate chaotic signal when it is reflected back with a fixed bias current and a strong OF signal. The intensity of the two linear polarizations modes of VCSEL is measured for a range of bias current, which provides a detailed investigation for its dynamics dependence. The results show that, the antiphase chaotic synchronization enhances with increasing the angle of orthogonal polarization of OF. Polarization modes are oscillated entirely in the chaotic regime in antiphase synchronization with no time delay at the bias currents of 1.2 (low) and 1.7 mA (high). However, the synchronization quality of the two modes is completely deteriorated when the bias current is increased to 1.7 mA at a polarization angle of 70 o , where power modes differences are increased. The result shows that, the power mode difference affects antiphase synchronization dynamics and thus destroys the mode computation effects. In addition, polarization switching take place at the polarization angles of 60 o and about 33 o at low and high bias currents, respectively. Polarization mode hopping is also observed, which is associated with improvement of the antiphase synchronization dynamics.

Interlayer antisynchronization in degree-biased duplex networks

“…In fact, there are numerous investigations on antiphase synchronization [54,[84][85][86][87] and antisynchronization [88][89][90][91][92][93][94][95][96][97][98][99]. However, our goal is to look at the interlayer antisynchronization of attractive-repulsively coupled amplitude oscillators in a multilayer network.…”