期刊
OPTICS LETTERS
卷 42, 期 19, 页码 3912-3915出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.42.003912
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资金
- National Natural Science Foundation of China (NSFC) [61307074, 61405177]
- Fujian Province Science Foundation [2015J01658, JZ160479]
- Zhejiang Province Science Foundation [LY17F050008]
- Natural Science Foundation of Zhejiang Province [LR15F050002]
- Nature Basic Research Program of China [2013CB632105]
A novel polarization beam splitter based on an anti-symmetric sidewall Bragg grating in a multimode silicon-on-insulator strip waveguide is demonstrated. Anti-symmetric spatially periodic refractive-index perturbations are designed for strong coupling between the fundamental (TE0) and the first-order transverse electric modes (TE1), while not for transfer magnetic modes. An adiabatic coupler is cascaded at the input-port, so as to drop the TE1 reflection. The Bragg grating has a compact length of similar to 20 mu m (55 periods). The polarization isolations of the through-and drop-ports at the wavelength of 1557 nm are 34 and 31 dB, respectively. A broad bandwidth of 64 nm and a large fabrication tolerance of 80 nm for polarization isolation over 20 dB are also achieved. (C) 2017 Optical Society of America
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