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State-of-the-Art and Perspectives on Silicon Waveguide Crossings: A Review

Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen 518055, China
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Micromachines 2020, 11(3), 326; https://doi.org/10.3390/mi11030326 (registering DOI)
Received: 10 February 2020 / Revised: 15 March 2020 / Accepted: 19 March 2020 / Published: 20 March 2020
In the past few decades, silicon photonics has witnessed a ramp-up of investment in both research and industry. As a basic building block, silicon waveguide crossing is inevitable for dense silicon photonic integrated circuits and efficient crossing designs will greatly improve the performance of photonic devices with multiple crossings. In this paper, we focus on the state-of-the-art and perspectives on silicon waveguide crossings. It reviews several classical structures in silicon waveguide crossing design, such as shaped taper, multimode interference, subwavelength grating, holey subwavelength grating and vertical directional coupler by forward or inverse design method. In addition, we introduce some emerging research directions in crossing design including polarization-division-multiplexing and mode-division-multiplexing technologies. View Full-Text
Keywords: silicon photonics; integrated optics; waveguide crossing design; multimode interference (MMI); sub-wavelength grating (SWG); multiplexing technology silicon photonics; integrated optics; waveguide crossing design; multimode interference (MMI); sub-wavelength grating (SWG); multiplexing technology
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MDPI and ACS Style

Wu, S.; Mu, X.; Cheng, L.; Mao, S.; Fu, H. State-of-the-Art and Perspectives on Silicon Waveguide Crossings: A Review. Micromachines 2020, 11, 326.

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