Breaking the Coupling Efficiency–Bandwidth Trade-Off in Surface Grating Couplers Using Zero-Order Radiation,Laser & Photonics Reviews

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Breaking the Coupling Efficiency–Bandwidth Trade-Off in Surface Grating Couplers Using Zero-Order Radiation
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-05-05 , DOI: 10.1002/lpor.202000542
Alejandro Sánchez‐Postigo ₁ , Robert Halir ₁ , J. Gonzalo Wangüemert‐Pérez ₁ , Alejandro Ortega‐Moñux ₁ , Shurui Wang ₂ , Martin Vachon ₂ , Jens H. Schmid ₂ , Dan‐Xia Xu ₂ , Pavel Cheben ₂ , Íñigo Molina‐Fernández ₁

Affiliation

Silicon photonics provides wafer-scale fabrication of densely integrated photonic circuits that are enabling breakthrough applications in datacom, artificial intelligence, and healthcare. The sub-micrometer mode size of silicon waveguides makes efficient coupling to conventional single mode fibers extremely challenging. While advanced surface grating couplers can achieve sub-decibel coupling efficiencies, their operation relies on diffraction phenomena, which intrinsically limit the operational bandwidth. Here a novel type of surface coupler is experimentally demonstrated that overcomes the efficiency-bandwidth limitation of conventional diffraction gratings by harnessing zero-order radiation from a subwavelength metamaterial waveguide to a tilted silicon prism. The device achieves a coupling efficiency above 80% to an SMF-28 fiber in a record 1-dB bandwidth beyond 90 nm, opening new venues for highly efficient broadband fiber-to-chip surface coupling in silicon photonics.

中文翻译：

使用零级辐射打破表面光栅耦合器中耦合效率-带宽的权衡

硅光子学提供密集集成光子电路的晶圆级制造，可在数据通信、人工智能和医疗保健领域实现突破性应用。硅波导的亚微米模式尺寸使得与传统单模光纤的有效耦合极具挑战性。虽然先进的表面光栅耦合器可以实现亚分贝的耦合效率，但它们的操作依赖于衍射现象，这在本质上限制了操作带宽。在这里，通过利用从亚波长超材料波导到倾斜硅棱镜的零级辐射，实验证明了一种新型表面耦合器克服了传统衍射光栅的效率带宽限制。

更新日期：2021-06-10

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