| Kuo Zhou,Jun-bo Yang,Jian-kun Yang,Wei Zhou,Su-zhi Xu,Jia Xu,Xiu-jian Li.Non-polarization and high-coupling-efficiency coupler using multilevel grating structure[J].Optoelectronics Letters,2013,9(2):93-96 |
| Non-polarization and high-coupling-efficiency coupler using multilevel grating structure |
| Author Name | Affiliation | E-mail | | Kuo Zhou | College of Science, National University of Defense Technology, Changsha, 410073, China | | | Jun-bo Yang | College of Science, National University of Defense Technology, Changsha, 410073, China | yangjunbo008@sohu.com | | Jian-kun Yang | College of Science, National University of Defense Technology, Changsha, 410073, China | | | Wei Zhou | College of Science, National University of Defense Technology, Changsha, 410073, China | | | Su-zhi Xu | College of Science, National University of Defense Technology, Changsha, 410073, China | | | Jia Xu | College of Science, National University of Defense Technology, Changsha, 410073, China | | | Xiu-jian Li | College of Science, National University of Defense Technology, Changsha, 410073, China | |
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| Abstract: |
| A multilevel grating coupler based on silicon-on-insulator (SOI) material structure is proposed to realize the coupling between waveguide and waveguide or waveguide and fiber. This coupler is compatible with the current fabrication facilities for complementary metal oxide semiconductor (CMOS) technology with vertical coupling. This structure can realize coupling when the beams with transverse electric (TE) polarization and transverse magnetic (TM) polarization are incident at the same time. The influences of the grating coupler parameters including wavelength, the thickness of waveguide layer, the thickness of SiO2 layer and the number of steps on the TE mode and TM mode coupling efficiencies are discussed. Theory researches and simulation results indicate that the wavelength range is from 1533 nm to 1580 nm when the TE mode and TM mode coupling efficiencies are both more than 40% as the grating period is 0.99 μm. The coupling efficiencies of the incident TE and TM modes are 49.9% and 49.5% at the wavelength of 1565 nm, respectively, and the difference between them is only 0.4%. |
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