| 1. |
- Tang, Yongbo, et al.
(author)
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Proposal for a Grating Waveguide Serving as Both a Polarization Splitter and an Efficient Coupler for Silicon-on-Insulator Nanophotonic Circuits
- 2009
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In: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 21:1-4, s. 242-244
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Journal article (peer-reviewed)abstract
- A grating waveguide is introduced and designed to serve as both a polarization splitter and an efficient vertical coupler between a fiber and a silicon-on-insulator (SOI) nanophotonic waveguide. Through this grating waveguide, the light from the fiber can be efficiently coupled into an SOI chip where the two orthogonally polarized waves are separated to travel towards the opposite directions along the waveguide. According to our simulations, the optimized structure can give a high coupling efficiency of about 50% for both polarizations, as well as a large bandwidth of over 70 nm and a very low polarization crosstalk below -22 dB at the output ports.
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| 2. |
- Wang, Zhechao, et al.
(author)
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Experimental demonstration of an ultracompact polarization beam splitter based on a bidirectional grating coupler
- 2009
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In: 2009 Asia Communications and Photonics Conference and Exhibition, ACP 2009. - 9781557528773 ; , s. 5377257-
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Conference paper (peer-reviewed)abstract
- A bidirectional grating serving both as a polarization beam splitter and a vertical coupler for Silicon on Insulator nanophotonic circuits is fabricated and characterized. The measured coupling efficiency is as high as 43%. The demonstrated device has a large 3-dB bandwidth and a high extinction ratio between two orthogonal polarizations.
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| 3. |
- Wang, Zhechao, et al.
(author)
-
Ultracompact low-loss coupler between strip and slot waveguides
- 2009
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In: Optics Letters. - 0146-9592 .- 1539-4794. ; 34:10, s. 1498-1500
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Journal article (peer-reviewed)abstract
- We present both theoretical and experimental results of an ultracompact waveguide coupler that is capable of highly efficient coupling of light from strip waveguides to slot waveguides, and vice versa. By optimizing the geometrical parameters, it is possible to achieve extremely low-loss coupling. A coupling efficiency of 97% has been obtained experimentally while keeping the overall size down to the range below 10 mu m. Further analysis shows that the proposed coupler has relatively high tolerance to fabrication errors and is wavelength insensitive. (C) 2009 Optical Society of America
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