Length optimization of an S-shaped transition between offset optical waveguides.
Length optimization of an S-shaped transition between offset optical waveguides.
复制标题
偏移光波导之间 S 形过渡的长度优化。
作者：
D. Marcuse
我们推导了用于连接两个相对偏移的直集成光学波导的s形波导跃迁的辐射损耗表达式。本文假设扩散集成光学波导是在电子束机的帮助下产生的，电子束只允许在y方向上以离散的步骤定位。因此，我们必须考虑所需的平滑s形曲线的阶梯近似。轴由阶梯组成的波导由于其轴的准周期性变形而遭受辐射损失。第二个损耗贡献来自于波导轴的s形。这些损耗贡献的总和假设一个最小值，该最小值定义了过渡波导的最佳长度。
We derive expressions for the radiation loss of an S-shaped waveguide transition used to connect two straight integrated optics waveguides that are offset with respect to each other. It is assumed that the diffused integrated optics waveguides are produced with the help of an electron beam machine that allows beam positioning in the y direction only in discrete steps. We thus must consider staircase approximations to the desired smooth S-shaped curves. A waveguide whose axis consists of a staircase suffers radiation losses due to the quasi-periodic deformation of its axis. A second loss contribution comes from the S-shape of the waveguide axis. The sum of these loss contributions assumes a minimum that defines the optimum length of the transition waveguide.