Photo thermal effect graphene detector featuring 105 Gbit s<sup>-1</sup> NRZ and 120 Gbit s<sup>-1</sup> PAM4 direct detection.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33547318.
- Also identified by DOI 10.1038/s41467-021-21137-z and PMC identifier 7864989.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
One of the main challenges of next generation optical communication is to increase the available bandwidth while reducing the size, cost and power consumption of photonic integrated circuits. Graphene has been recently proposed to be integrated with silicon photonics to meet these goals because of its high mobility, fast carrier dynamics and ultra-broadband optical properties. We focus on graphene photodetectors for high speed datacom and telecom applications based on the photo-thermo-electric effect, allowing for direct optical power to voltage conversion, zero dark current, and ultra-fast operation. We report on a chemical vapour deposition graphene photodetector based on the photo-thermoelectric effect, integrated on a silicon waveguide, providing frequency response >65 GHz and optimized to be interfaced to a 50 Ω voltage amplifier for direct voltage amplification. We demonstrate a system test leading to direct detection of 105 Gbit s<sup>-1</sup> non-return to zero and 120 Gbit s<sup>-1</sup> 4-level pulse amplitude modulation optical signals.