Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 23, Issue 1, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2016.2545238
Keywords
Effective mode index (EMI); graphene; optical phase modulator; TE mode
Categories
Funding
- Chinese 973 Program [2012CB315701]
- National Natural Science Foundation of China [61435010, 61421002, 61307070]
- Science and Technology Innovation Team of Sichuan Province [2011JTD0001]
- KNAW, The Netherlands China exchange program [12CDP008]
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A high-speed optical phase modulator based on graphene-silicon waveguide (GSW) is presented. Two graphene flakes, sandwiched by insulating dielectric spacers, are embedded in a silicon waveguide to enhance the interaction between the graphene and light. By applying a bias on the graphene flakes, the refractive index variation of TE mode in the waveguide shows a large quasi-linear dynamic range, which is ideal for achieving optical phase modulation. Based on this structure, a pi phase shift can be achieved by a 75.6 mu m-long GSW. Calculations show that the 3 dB modulation bandwidth of the optical phase modulator can be as high as 119.5 GHz with a low consumption of 0.452 pJ/bit.
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