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Title: Compact double-part grating coupler for higher-order mode coupling
Authors: Lai, Yaxiao
Yu, Yu
Fu, Songnian
Xu, Jing
Shum, Perry Ping
Zhang, Xinliang
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Lai, Y., Yu, Y., Fu, S., Xu, J., Shum, P. P., & Zhang, X. (2018). Compact double-part grating coupler for higher-order mode coupling. Optics letters, 43(13), 3172-3175. doi:10.1364/OL.43.003172
Journal: Optics letters
Abstract: We propose and demonstrate a compact and efficient grating coupler for first-order mode fiber-to-chip coupling. The coupler is configured by a double-part grating structure combined with a curved Y-junction by means of mode diversity. Compared with a traditional grating coupler, the designed structure takes advantage of minimizing the taper lengths of gratings, while performing higher coupling efficiency and lower crosstalk. At a mere 20 μm taper length, we measured a peak coupling efficiency of -3.68  dB with a 1 dB bandwidth of 35 nm. The coupling performance for the fundamental mode is also investigated. A reduced crosstalk below -15  dB within the whole band with reasonable coupling efficiency can be experimentally observed.
ISSN: 0146-9592
DOI: 10.1364/OL.43.003172
Rights: © 2018 Optical Society of America. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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