The structure is simulated by FD-BPM, and the results demonstrate that the input power can be equally distributed into three output waveguides at large branching angles.

• 利用有限差分束传播法(FD-BPM)对此结构进行数值模拟，结果表明，输入功率可以在大分叉角情况下等分给三分支输出；