Journal
OPTICS EXPRESS
Volume 22, Issue 21, Pages 26173-26180Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.026173
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Funding
- Chinese 973 Program [2012CB315701, 2011CB301705]
- National Nature Science Foundation of China [61090393, 61421002, 61307070, 61307031]
- Science and Technology Innovation Team of Sichuan Province [2011JTD0001]
- KNAW, The Netherlands China exchange program [12CDP008]
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An electro-absorption optical modulator based on dual-graphene-on-graphene configuration is presented and investigated. Four graphene layers are embedded in a silicon-on-insulator (SOI) waveguide, the total metal-graphene contact resistance of this structure is reduced 50% by the graphene layers co-electrode design. By optimizing the position of each graphene-on-graphene (GOG) layer in the waveguide, a strong interaction between graphene layers and light is obtained, which leads to a significant change of the effective mode index (EMI) in the waveguide. Calculations show that an electro-absorption optical modulator can achieve 34 dB extinction ratio (ER) and 100 GHz modulation bandwidth with 5 mu m-long active region and 17.6 fJ/bit consumption. (C) 2014 Optical Society of America
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