Cited by 341Photonic and Optical DevicesPhotorefractive and Nonlinear OpticsAdvanced Photonic Communication Systems

100 GHz silicon–organic hybrid modulator

Open access
Alloatti, Luca, Palmer, Robert, Diebold, Sebastian, Pahl, Kai Philipp, Chen, Baoquan, Dinu, Raluca, Fournier, Maryse, Fedeli, Jean-Marc +4 more·2014·Light: Science & Applications

Abstract

Electro-optic modulation at frequencies of 100 GHz and beyond is important for photonic-electronic signal processing at the highest speeds. To date, however, only a small number of devices exist that can operate up to this frequency. In this study, we demonstrate that this frequency range can be addressed by nanophotonic, silicon-based modulators. We exploit the ultrafast Pockels effect by using the silicon–organic hybrid (SOH) platform, which combines highly nonlinear organic molecules with silicon waveguides. Until now, the bandwidth of these devices was limited by the losses of the radiofrequency (RF) signal and the RC (resistor-capacitor) time constant of the silicon structure. The RF losses are overcome by using a device as short as 500 µm, and the RC time constant is decreased by using a highly conductive electron accumulation layer and an improved gate insulator. Using this method, we demonstrate for the first time an integrated silicon modulator with a 3dB bandwidth at an operating frequency beyond 100 GHz. Our results clearly indicate that the RC time constant is not a fundamental speed limitation of SOH devices at these frequencies. Our device has a voltage–length product of only V π L =11 V mm, which compares favorably with the best silicon-photonic modulators available today. Using cladding materials with stronger nonlinearities, the voltage–length product is expected to improve by more than an order of magnitude.

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Registry

Crossref · 10.1038/lsa.2014.54

Cites

21 of 21 references verified0 citation errors · 0 not checkable

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  • The most pure electro-optic modulation relies on the Pockels effect, which provides an intrinsically very high E/O BW, even exceeding 100 GHz.

    “The most ‘pure’ electro-optic modulation relies on the Pockels effect, which provides an intrinsically very high E/O BW, even exceeding 100 GHz57,67–70”

    From Roadmapping the next generation of silicon photonics (2024) · cites this paper as [67]

  • Polymer silicon-organic-hybrid (SOH) and plasmonic-organic-hybrid (POH) require poling and hermetic sealing, creating significant challenges to making stable devices.

    “Polymer silicon-organic-hybrid (SOH)67,72 and plasmonic-organic-hybrid (POH)69 require poling and hermetic sealing, creating significant challenges to making stable devices.”

    From Roadmapping the next generation of silicon photonics (2024) · cites this paper as [67]

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Authors
Alloatti, L., Palmer, R., Diebold, S., Pahl, K. P., Chen, B., Dinu, R., Fournier, M., Fedeli, J.-M., Zwick, T., Freude, W., Koos, C., & Leuthold, J.
Affiliations
  • Karlsruhe Institute of Technology (DE)
  • Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
Corresponding author
  • Alloatti, Luca
  • Koos, Christian
Venue
Light: Science & Applications
Published
2014-05-23
Volume
3
Issue
5
Pages
e173-e173
ISSN
2047-7538 (ISSN-L)
OpenAlex
W1542036482
Cited by
341
References
21
Citations by year
2026: 15 · 2025: 27 · 2024: 23 · 2023: 35 · 2022: 27 · 2021: 24 · 2020: 36 · 2019: 27 · 2018: 36 · 2017: 30 · 2016: 25 · 2015: 30 · 2014: 5
FWCI
15.94
Type
journal article
Language
en
Open access
Locations
  • Light Science & Applications (publishedVersion, cc-by)
  • Repository KITopen (Karlsruhe Institute of Technology) (publishedVersion)
  • Repository for Publications and Research Data (ETH Zurich) (submittedVersion, cc-by)
  • ETH Zürich Research Collection (cc-by)
  • KITopen (other-oa)
Funders
  • Deutsche Forschungsgemeinschaft (248609)
  • Bundesministerium für Bildung und Forschung
  • Alfried Krupp von Bohlen und Halbach-Stiftung
  • FP7 Ideas: European Research Council (280145)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Photonic and Optical Devices
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photorefractive and Nonlinear Optics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Photonic Communication Systems
Keywords
electro-optic modulation, silicon waveguides, RC time constant, electron accumulation layer, gate dielectric, voltage-length product, cladding materials

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