He Yu, Zhang Yong, Wang Hongwei, Su Yikai
Opt Express. 2018 Dec 10;26(25):33005-33012. doi: 10.1364/OE.26.033005.
Mode blocking may be required in mode-division multiplexing (MDM) systems. We demonstrate a silicon mode blocking filter using a subwavelength grating-based contra-directional coupler. The device is capable of blocking the undesired mode channel without affecting the propagation of the other modes. As a proof-of-concept experiment, two mode blocking filters are experimentally demonstrated, which can block the TE mode and the TE mode, respectively. Low crosstalk (≤21.0 dB) and reasonable insertion losses (≤2.3 dB) are achieved for both the TE-mode- and the TE-mode blocking filters.
在模式分割复用（MDM）系统中可能需要模式阻塞。我们展示了一种基于亚波长光栅的反向定向耦合器的硅模式阻塞滤波器。该器件能够阻塞不需要的模式通道，而不影响其他模式的传播。作为概念验证实验，通过实验展示了两个模式阻塞滤波器，它们分别可以阻塞TE模式和TE模式。对于TE模式阻塞滤波器和TE模式阻塞滤波器，均实现了低串扰（≤21.0 dB）和合理的插入损耗（≤2.3 dB）。
