Double-layer graphene on photonic crystal waveguide electro-absorption modulator with 12 GHz bandwidth

Zhao Cheng, Xiaolong Zhu, Michael Galili, Lars Hagedorn Frandsen, Hao Hu, Sanshui Xiao, Jianji Dong, Yunhong Ding, Leif Katsuo Oxenløwe, Xinliang Zhang

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Graphene has been widely used in silicon-based optical modulators for its ultra-broadband light absorption and ultrafast optoelectronic response. By incorporating graphene and slow-light silicon photonic crystal waveguide (PhCW), here we propose and experimentally demonstrate a unique double-layer graphene electroabsorption modulator in telecommunication applications. The modulator exhibits a modulation depth of 0.5 dB/μm with a bandwidth of 13.6 GHz, while graphene coverage length is only 1.2 μm in simulations. We also fabricated the graphene modulator on silicon platform, and the device achieved a modulation bandwidth at 12 GHz. The proposed graphene-PhCW modulator may have potentials in the applications of on-chip interconnections.
Original languageEnglish
Number of pages9
Publication statusAccepted/In press - 2020


  • Photonic crystal waveguides
  • Graphene
  • Modulators
  • Electro-optical devices

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