CUED Publications database

Graphene-silicon phase modulators with gigahertz bandwidth

Sorianello, V and Midrio, M and Contestabile, G and Asselberghs, I and Van Campenhout, J and Huyghebaert, C and Goykhman, I and Ott, AK and Ferrari, AC and Romagnoli, M (2017) Graphene-silicon phase modulators with gigahertz bandwidth. Nature Photonics, 12. pp. 40-44. ISSN 1749-4885

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The modulator is a key component in optical communications. Several graphene-based amplitude modulators have been reported based on electro-absorption. However, graphene phase modulators (GPMs) are necessary for functions such as applying complex modulation formats or making switches or phased arrays. Here, we present a 10 Gb s -1 GPM integrated in a Mach-Zehnder interferometer configuration. This is a compact device based on a graphene-insulator-silicon capacitor, with a phase-shifter length of 300 μm and extinction ratio of 35 dB. The GPM has a modulation efficiency of 0.28 V cm at 1,550 nm. It has 5 GHz electro-optical bandwidth and operates at 10 Gb s -1 with 2 V peak-to-peak driving voltage in a push-pull configuration for binary transmission of a non-return-to-zero data stream over 50 km of single-mode fibre. This device is the key building block for graphene-based integrated photonics, enabling compact and energy-efficient hybrid graphene-silicon modulators for telecom, datacom and other applications.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 05 Jan 2018 20:30
Last Modified: 11 Apr 2021 20:44
DOI: 10.1038/s41566-017-0071-6