Interaction of bright-dark solitons in a silicon-on-insulator optical waveguide

ABSTRACT

In this paper, we use a distributed Fourier transform to simulate the interaction effects of bright and dark solitons numerically through a nonlinear coupled-wave Schrödinger equation satisfied by the TE and TM mode direction of silicon-on-insulator waveguides. The simulation shows that an increase in the relative polarization angle of bright and dark solitons reduces the influence of bright solitons on dark solitons but increases the influence of dark solitons on bright solitons when the nonlinear effect is constant. At the appropriate polarization angle, the dark soliton will show a quasi-soliton waveform under the influence of a bright soliton. When the power is similar, the interaction is most obvious. An increase in the bright soliton pulse width can increase its effective transmission distance and is greatly affected by dark solitons at short distances. A change in the dark soliton pulse width has little effect on the interaction. Changing the delay difference can change the position and peak of a quasi-soliton in a dark soliton. An appropriate delay difference can improve the effective transmission distance of the bright soliton and increase its stability in a short distance.

KEYWORDS:

• Silicon-on-insulator waveguides
• bright and dark solitons
• interaction
• relative polarization angle