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A Novel Design of Grating Couplers for Efficient Broadband Coupling between Silicon-on-Insulator Nanophotonic Waveguides and Fibres |
| YU He-Jun;YU Jin-Zhong |
| State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences,
Beijing 100083 |
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| Cite this article: |
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YU He-Jun, YU Jin-Zhong 2005 Chin. Phys. Lett. 22 2865-2868 |
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Abstract A novel design of out-of-plane grating couplers is proposed for coupling between silicon-on-insulator nanophotonic waveguides and single-mode fibres. The coupler with the first-order diffraction coupling to the optical fibre is actually a second-order reflected grating with two times of period of the first-order grating. To enhance outcoupled power, a back hole is designed to form in the silicon substrate and a kind of metals is placed on the top acting as a reflection layer. The coupler is optimized using coupled-mode-based simulations, showing that the coupling efficiency to and from tapered optical fibre can be as high as 85% with 1dB bandwidth about 23nm.
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| Keywords:
42.82.Ds
42.82.Et
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Published: 01 November 2005
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| PACS: |
42.82.Ds
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(Interconnects, including holographic interconnects)
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42.82.Et
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(Waveguides, couplers, and arrays)
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