The temperature characteristics of unbiased separate spatial soliton pairs due to two-photon photorefractive effect

We investigate theoretically the temperature effects on the intensity profile and spatial evolution of separate spatial soliton pairs formed in a serial two-photon photovoltaic photorefractive crystal circuit. Our numerical results show that, for a stable bright–dark soliton pair, when the temperature of the dark soliton crystal changes, the intensity profiles of the dark and the bright soliton will all change. When the temperature of the bright soliton crystal changes, only change the intensity profiles of the bright soliton will. For a bright–bright soliton pairs, the intensity profiles of the soliton determined only by the parameters of the corresponding crystal, whereas the intensity profiles of the soliton determined by the parameters of two crystals for the dark–dark soliton pairs. Finally, we discuss the temperature of dark solitons effects on the dynamical evolution of bright–dark soliton pairs.