We numerically simulate the evolution of the dark-notch-bearing optical beam in the logarithmically saturable nonlinear media based on beam propagation method (BPM). The simulation results indicate that the multiple dark spatial solitons are deep, possible in this type of nonlinear media. The number of multiple dark spatial solitons depends on the width of the dark notch, the initial conditions and the peak intensity of the initial input beam. Under the odd and even initial conditions, the odd and even number sequence of multiple dark spatial solitons can be obtained, respectively. For an input beam with fixed optical intensity, the number of dark solitons increases with the width of the initial input dark notch. The behavior of the multiple dark solitons in this type of media is similar to that in a photorefractive nonlinear crystal.

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Specialty of optoelectronic information science and engineering is aim to cultivate senior specialized talents of photoelectric system design and implementation. The optical signal transmission is indispensable in the photovoltaic system. The problems existing in the teaching of information classes of the specialty at present are analysised and the teaching mode aiming to engineering training is proposed. The specific content is as follows: The principle problem of optical information transmission system is solved in the theoretical teaching in the classroom, the problem of the system design and simulation implementation is solved in the course design, the problem of the hardware implementation of the system is solved in the professional experiments. The training of the whole process from the principle of optical information transmission system design, software simulation to hardware implementation is achieved through this kind of teaching mode.