| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Silicon-Based Asymmetric Add-Drop Microring Resonators with Ultra-Large Through-Port Extinctions |
| XIAO Xi, LI Yun-Tao, YU Yu-De, YU Jin-Zhong |
| National 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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XIAO Xi, LI Yun-Tao, YU Yu-De et al 2010 Chin. Phys. Lett. 27 054208 |
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Abstract We theoretically simulate and experimentally demonstrate ultra-large through-port extinctions in silicon-based asymmetrically-coupled add-drop microring resonators (MRs). Through-port responses in an add-drop MR are analyzed by simulations and large extinctions are found when the MR is near-critically coupled. Accurate fabrication techniques are applied in producing a series of 20 μm-radii add-drop microrings with drop-side gap-widths in slight differences. A through-port extinction of about 42.7 dB is measured in an MR with through- and drop-side gap-width to be respectively 280 nm and 295 nm. The large extinction suggests about a 20.5 dB improvement from the symmetrical add-drop MR of the same size and the through-side gap-width. The experimental results are finally compared with the post-fabrication simulations, which show a gap-width tolerance of >30 nm for the through-port extinction enhancement.
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| Keywords:
42.82.-m
42.79.Ci
42.60.Da
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Received: 11 January 2010
Published: 23 April 2010
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| PACS: |
42.82.-m
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(Integrated optics)
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42.79.Ci
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(Filters, zone plates, and polarizers)
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42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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