提出了用有效折射率法结合转移矩阵理论对梯 形截面脊波导进行数值分析的新方法。 对梯形截面脊波导中模式传播常数和模式间耦合系 数的分析表明, 梯形截面脊波导与稍宽的矩形截面脊波导行为相同。 这一结论有利于简化 梯形截面脊波导的设计, 提高实际器件的精度。

To analyze rib waveguides with trapezoidal cross se ction, a simple numberical analysis is presented which uses effective index meth od and transfer matrix theory. Results of the propagation constants and the coup ling coefficients between modes in trapezoidal-cross-sectioned rib waveguides show that they have the same action with wider rectangular-cross-sectioned rib waveguides. This will simplify the designing of trapezoidal-cross-sectioned r ib waveguides and increase the precision of practical device.