A polymer waveguide mode selecting switch (MSS) composed of two cascaded MMI couplers is demonstrated. The MSS can switch different data channels over $\text{E}_{\mathbf {00}}$ and $\text{E}_{\mathbf {10}}$ modes. Polymer waveguide dimensions are optimized with beam propagation method. The simulated results indicate that the worst insertion loss is 5.5 dB at 1550 nm and the switching powers for $\text{E}_{\mathbf {10}}$ mode between two different channels are 4.5 and 12.3 mW, respectively. The extinction ratio and crosstalk are less than 19.7 and −19.6 dB, respectively. The switching performances of fabricated MSS prove the functionality of proposed design, which promises its potentials in mode-division-multiplexing applications.

中文翻译：

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基于级联MMI耦合器的聚合物模式选择开关

演示了由两个级联 MMI 耦合器组成的聚合物波导模式选择开关 (MSS)。MSS 可以切换不同的数据通道 $\text{E}_{\mathbf {00}}$ 和 $\text{E}_{\mathbf {10}}$ 模式。聚合物波导尺寸通过光束传播方法进行了优化。仿真结果表明，最坏的插入损耗在 1550 nm 处为 5.5 dB，开关功率为 $\text{E}_{\mathbf {10}}$ 两个不同通道之间的模式分别为 4.5 和 12.3 mW。消光比和串扰分别小于 19.7 和 -19.6 dB。制造的 MSS 的开关性能证明了所提出设计的功能，这有望在模分复用应用中发挥潜力。