期刊
LASER & PHOTONICS REVIEWS
卷 12, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201700240
关键词
integrated optics devices; metamaterials; modes
资金
- National Key Research and Development Program [2016YFB0402502]
- National Natural Science Foundation of China [61675178, 61377023]
On-chip multi-mode communication has attracted much attention for its potential to greatly expand the bandwidth of data transmission. However, the application of multi-mode transmission is still restricted since the multi-mode waveguide can't be compactly routed, especially in the sharp bending region. The challenge lies in decreasing the significant inter-mode coupling in the multi-mode bending with a small radius. Few works have been reported to achieve multi-mode bending, but all suffer from the complex fabrication. In this paper, an ultra-sharp multi-mode waveguide is proposed, which is assisted with metamaterial-based mode converters. The sub-wavelength structures are directly written onto the polymer cladding. By engineering the effective medium index of the metamaterial cladding in the mode converters, the inter-mode coupling is dramatically inhibited. The fabricated sharp bending with a 30-m radius shows that the crosstalk is <-20dB and the loss is <1 dB over a >80 nm wavelength band.
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