On-chip silicon mode blocking filter employing subwavelength-grating based contra-directional coupler

作者：Yu He, Yong Zhang, Hongwei Wang, Yikai Su

摘要：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 TE₀ mode and the TE₁ mode, respectively. Low crosstalk (≤21.0 dB) and reasonable insertion losses (≤2.3 dB) are achieved for both the TE₀-mode- and the TE₁-mode blocking filters.

出版源：Optics Express

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