Journal
MICROMACHINES
Volume 11, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/mi11030326
Keywords
silicon photonics; integrated optics; waveguide crossing design; multimode interference (MMI); sub-wavelength grating (SWG); multiplexing technology
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Funding
- Shenzhen Science and Technology Innovation Commission [JCYJ20180507183815699, JCYJ20170818094001391, KQJSCX20170727163424873]
- Tsinghua-Berkeley Shenzhen Institute (TBSI) Faculty Start-up Fund
- Shenzhen Data Science and Information Technology Engineering Laboratory
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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.
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