Towards the Development of Ultrafast Photodetectors Based on Graphene for the Next-generation Telecommunication Systems

Here, we report on our recent efforts to develop of a photodetector based on single-layer graphene two-terminal device on the sapphire substrate. Our detector operates at $1.55 \mu \mathrm{m}$, which corresponds to the telecom window. We have demonstrated that our detector operates under zero bias conditions at room temperature, and the signal-to-noise ratio reaches 45dB. The measured frequency bandwidth reaches 20GHz and is limited by the available experimental equipment.