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Significantly High Modulation Efficiency of Compact Graphene Modulator Based on Silicon Waveguide.
Haowen Shu1, Zhaotang Su1, Le Huang2
1State Key Laboratory of Advanced Optical Communications System and Networks, Peking University, Beijing, 100871, China.
Scientific Reports
|January 19, 2018
Summary
This study presents a highly efficient graphene modulator on a silicon waveguide, achieving superior modulation efficiency for optical communication. It demonstrates switchable electro-absorption and electro-refractive modes with high performance.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Graphene's unique electro-optical properties offer potential for advanced photonic devices.
- Silicon photonics provides a robust platform for integrated optical circuits.
Purpose of the Study:
- To demonstrate a compact graphene modulator with high modulation efficiency on a silicon waveguide.
- To investigate and switch between electro-absorption and electro-refractive modulation modes.
Main Methods:
- Theoretical modeling and experimental validation of graphene modulator performance.
- Utilizing the electro-refractive and electro-absorption effects of graphene in a silicon waveguide structure.
Main Results:
- Achieved a high extinction ratio of 25 dB in electro-absorption mode (0-1 V).
- Demonstrated 185-pm spectrum shift in electro-refractive mode (1-3 V).
- Reported a modulation efficiency of 1.29 V·mm, significantly outperforming previous graphene phase modulators.
Conclusions:
- The developed graphene-silicon waveguide modulator exhibits exceptional modulation efficiency.
- The device's ability to switch modulation modes highlights its versatility.
- This technology shows great promise for future optical communication and interconnection systems.
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