| 1. |
- Tang, Yongbo, et al.
(författare)
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High efficiency nonuniform grating coupler by utilizing the lag effect in the dry etching process
- 2010
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Ingår i: Optics InfoBase Conference Papers. - Washington, D.C. : Optical Society of America (OSA). - 9781557528841
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Konferensbidrag (refereegranskat)abstract
- Utilizing the lag effect in dry etching, a nonuniform silicon-on-insulator grating coupler is designed and fabricated. Over 80% (>-1dB) coupling efficiency is theoretically obtained and experimental coupling efficiency of 55% is achieved for TE polarization.
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| 2. |
- Tang, Yongbo, et al.
(författare)
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Highly efficient nonuniform grating coupler for silicon-on-insulator nanophotonic circuits
- 2010
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Ingår i: Optics Letters. - 0146-9592 .- 1539-4794. ; 35:8, s. 1290-1292
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Tidskriftsartikel (refereegranskat)abstract
- We present design, fabrication, and characterization of a silicon-on-insulator grating coupler of high efficiency for coupling between a silicon nanophotonic waveguide and a single mode fiber. By utilizing the lag effect of the dry etching process, a grating coupler consisting of nonuniform grooves with different widths and depths is designed and fabricated to maximize the overlapping between the upward wave and the fiber mode. The measured waveguide-to-fiber coupling efficiency of 64% (−1.9 dB) for the transverse electric polarization is achieved by the present nonuniform grating coupler directly defined on a regular silicon-on-insulator wafer.
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| 3. |
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| 4. |
- Wang, Zhechao, et al.
(författare)
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Experimental demonstration of an ultracompact polarization beam splitter based on a bidirectional grating coupler
- 2009
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Ingår i: 2009 Asia Communications and Photonics Conference and Exhibition, ACP 2009. - 9781557528773 ; , s. 5377257-
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Konferensbidrag (refereegranskat)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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| 5. |
- Wang, Zhechao, et al.
(författare)
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High Efficiency Grating Couplers for Silicon-on-Insulator Photonic Circuits
- 2010
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Ingår i: 36th European Conference and Exhibition on Optical Communication, ECOC 2010. - : IEEE Communications Society. - 9781424485369 - 9781424485345
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Konferensbidrag (refereegranskat)abstract
- We have experimentally demonstrated two methods for improving the coupling efficiency of grating couplers. A grating coupler-polarization splitter is measured to have over 50% efficiency for both polarizations. 68% efficiency for single polarization is achieved by a nonuniform grating coupler.
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| 6. |
- Wang, Zhechao, et al.
(författare)
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Ultracompact low-loss coupler between strip and slot waveguides
- 2009
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Ingår i: Optics Letters. - 0146-9592 .- 1539-4794. ; 34:10, s. 1498-1500
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Tidskriftsartikel (refereegranskat)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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| 7. |
- Wosinski, Lech, et al.
(författare)
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Coupling of silicon nanophotonic circuits to optical fibers
- 2010
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Ingår i: Asia Communications and Photonics Conference and Exhibition, ACP 2010. - : IEEE Communications Society. - 9781424471119 ; , s. 421-422
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Konferensbidrag (refereegranskat)abstract
- Silicon-based nanophotonic waveguides and components fabricated in silicon-on-insulator technology build a platform for high density photonic integrated circuits, where active III-V devices can be incorporated using evanescent field coupling. These circuits can be fabricated with standard CMOS technology processing, allowing for low cost mass production in applications such as optical networks, computer interconnects and sensing. Connecting of these integrated structures to the real world of optical fibers appears is an important problem to be solved. In this paper we discuss some solutions and present some of fabricated devices including a grating coupler-polarization splitter with over 50% efficiency for both polarizations and a nonuniform grating coupler with 68% efficiency for single polarization. To the best of our knowledge, they are the highest coupling efficiencies obtained by regular SOI grating couplers for both, single polarization and polarization splitting.
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| 8. |
- Wosinski, Lech, et al.
(författare)
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Interfacing of Silicon-on-insulator nanophotonic circuits to the real world
- 2010
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Ingår i: 2010 12th International Conference on Transparent Optical Networks (ICTON). - : IEEE Communications Society. - 9781424477999 - 9781424477975 ; , s. 5549268-
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Konferensbidrag (refereegranskat)abstract
- Silicon-on-insulator material structure allows for very high light confinement in the silicon core due to its high refractive index. The advantages of this technology include the possibility to miniaturize devices and integrate different functions on a single chip, reduction of optical loss and power consumption and potential perspectives for low cost mass production in CMOS technology line. Together with these advantages some new problems appear in comparison to weakly guided light in silica-on-silicon components, causing additional challenges for researchers to be solved. Besides much higher demands for fabrication accuracy, high refractive index contrast introduces additional optical input/output coupling problems as well as much higher polarization sensitivity of nanophotonic structures. Here we will propose some solutions for these problems and illustrate them with designed and fabricated components
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