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Review

Edge Couplers in Silicon Photonic Integrated Circuits: A Review

Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen 518055, China
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Appl. Sci. 2020, 10(4), 1538; https://doi.org/10.3390/app10041538
Received: 2 February 2020 / Revised: 18 February 2020 / Accepted: 20 February 2020 / Published: 24 February 2020
Silicon photonics has drawn increasing attention in the past few decades and is a promising key technology for future daily applications due to its various merits including ultra-low cost, high integration density owing to the high refractive index of silicon, and compatibility with current semiconductor fabrication process. Optical interconnects is an important issue in silicon photonic integrated circuits for transmitting light, and fiber-to-chip optical interconnects is vital in application scenarios such as data centers and optical transmission systems. There are mainly two categories of fiber-to-chip optical coupling: off-plane coupling and in-plane coupling. Grating couplers work under the former category, while edge couplers function as in-plane coupling. In this paper, we mainly focus on edge couplers in silicon photonic integrated circuits. We deliver an introduction to the research background, operation mechanisms, and design principles of silicon photonic edge couplers. The state-of-the-art of edge couplers is reviewed according to the different structural configurations of the device, while identifying the performance, fabrication feasibility, and applications. In addition, a brief comparison between edge couplers and grating couplers is conducted. Packaging issues are also discussed, and several prospective techniques for further improvements of edge couplers are proposed. View Full-Text
Keywords: silicon photonics; optical interconnects; fiber-to-chip coupling; edge couplers; inverse taper silicon photonics; optical interconnects; fiber-to-chip coupling; edge couplers; inverse taper
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MDPI and ACS Style

Mu, X.; Wu, S.; Cheng, L.; Fu, H.Y. Edge Couplers in Silicon Photonic Integrated Circuits: A Review. Appl. Sci. 2020, 10, 1538. https://doi.org/10.3390/app10041538

AMA Style

Mu X, Wu S, Cheng L, Fu HY. Edge Couplers in Silicon Photonic Integrated Circuits: A Review. Applied Sciences. 2020; 10(4):1538. https://doi.org/10.3390/app10041538

Chicago/Turabian Style

Mu, Xin, Sailong Wu, Lirong Cheng, and H.Y. Fu 2020. "Edge Couplers in Silicon Photonic Integrated Circuits: A Review" Applied Sciences 10, no. 4: 1538. https://doi.org/10.3390/app10041538

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