Stimulated Brillouin scattering (SBS) lasers based on silicon waveguides with large SBS gain, have been widely used in frequency tunable laser emission, mode-locked pulse laser, low-noise oscillator, optical gyroscope, and other fields. However, current SBS lasers still need long waveguide lengths to realize Brillouin laser output, which increases the waveguide losses and is not conductive to be integrated. In this paper, we propose a silicon ring waveguide, in order to tune the frequency of the phonon field of SBS laser based on the silicon substrate of the ring cavity. The simulation results exhibit that the tailorable forward SBS effect is realized in the silicon-based optical waveguide with a large SBS gain up to 1.90 W^-1m^-1. Particularly, with the mutual restraint between photoelastic and moving boundary effects, the tunable phonon frequencies emitting from 1 to 15 GHz are realized through the conversion among higher order modes by modifying the widths of the ring cavity. Therefore, this silicon waveguide based on ring cavity will provide a new technical scheme for designing tunable SBS lasers by tuning the ring widths. In addition, this enhanced and broadband acoustic radiation will pave the way for hybrid integration in silicon-based optical waveguide, micro-electromechanical system, and CMOS signal processing technology.

基于硅波导的受激布里渊散射（SBS）激光器具有大SBS增益，已广泛应用于频率可调激光发射、锁模脉冲激光器、低噪声振荡器、光学陀螺仪等领域。然而，目前的SBS激光器仍然需要较长的波导长度来实现布里渊激光输出，这增加了波导损耗并且不利于集成。在本文中，我们提出了一种硅环形波导，以基于环形腔的硅衬底来调谐 SBS 激光器的声子场的频率。仿真结果表明，在具有高达 1.90 W ^-1 m ^-1的大 SBS 增益的硅基光波导中实现了可定制的前向 SBS 效应. 特别是，在光弹性和移动边界效应之间的相互制约下，通过改变环形腔的宽度，通过高阶模式之间的转换，实现了可调谐声子频率从 1 到 15 GHz。因此，这种基于环形腔的硅波导将为通过调节环形宽度来设计可调谐SBS激光器提供一种新的技术方案。此外，这种增强的宽带声辐射将为硅基光波导、微机电系统和CMOS信号处理技术的混合集成铺平道路。