期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 35, 期 9, 页码 1705-1709出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2667711
关键词
Bragg reflectors; gratings; integrated optics device; waveguides; wavelength filtering devices
资金
- Nature Basic Research Program of China [2013CB632105]
- National Natural Science Foundation of China [61307074, 61405177]
- Natural Science Foundation of Fujian Province [2015J01658, JZ160479]
- Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholar [LR15F050002]
- Natural Science Foundation of Zhejiang Province [LY17F050008]
- National Research Foundation of Singapore [NRF-CRP12-2013-04]
- Longyan University Science Foundation [2014019]
A silicon photonic add-drop filter is demonstrated with sidewall Bragg gratings in a multimode strip waveguide. The operating principle is based on the contradirectional coupling between the TE0 mode and different higher-order modes inside the multimode waveguide, which depends on the symmetry property of the periodic refractive-index perturbations. In order to relax the fabrication tolerance, a pair of adiabatic couplers is used to add/drop the optical signal at the output/input ports of the multimode waveguide. Experimental results show that the functionality of add/drop filtering is successfully achieved with a low insertion loss of 0.6 dB. We also show that by sweeping the multimode waveguide width from 700 to 1400 nm, the bandwidth can be flexibly tuned from 16 to 2 nm.
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