| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Compact 2×2 Multi-Mode Interference Couplers with Uneven Splitting-Ratios Based on Silicon Nanowires |
| ZHOU Jing-Tao1**, SHEN Hua-Jun1, YANG Cheng-Yue1, LIU Huan-Ming1, TANG Yi-Dan1, LIU Xin-Yu1
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Key Laboratory of Microelcectronics Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029
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| Cite this article: |
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ZHOU Jing-Tao, SHEN Hua-Jun, YANG Cheng-Yue et al 2011 Chin. Phys. Lett. 28 084212 |
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Abstract Two types of uneven splitting-ratio 2×2 multi−mode interference (MMI) couplers based on silicon nanowires are designed, fabricated and characterized. The splitting ratios are 85:15 and 72:28, respectively. The devices have compact sizes and low excess losses. The footprints of the rectangular MMI region are only about 3 µm×18 µm and 3 µm×14 µm, and the minimum excess losses (ELs) are 1.30 dB and 0.82 dB. The measured splitting−ratios are consistent with the designed values. Based on their performance, these 2×2 MMI couplers are suitable candidates for the coupling section of microring resonators where a large resonance bandwidth is required for high speed signal processing. The uneven splitting capability also provides a convenient way to further optimize the Q factor and the bandwidth of the resonator.
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| Keywords:
42.79.Gn
42.79.-e
42.82.Et
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Received: 31 March 2011
Published: 28 July 2011
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| PACS: |
42.79.Gn
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(Optical waveguides and couplers)
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42.79.-e
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(Optical elements, devices, and systems)
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42.82.Et
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(Waveguides, couplers, and arrays)
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