Publications by authors named "G Contestabile"
Moiré excitons (MXs) are electron-hole pairs localised by the periodic (moiré) potential forming in two-dimensional heterostructures (HSs). MXs can be exploited, e.g.
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- This paper presents optics-informed Neural Networks (NNs) designed to enhance the performance of End-to-End deep learning models for optical transmission links using Intensity Modulation with Direct Detection (IM/DD).
- The NNs utilize building blocks derived from the response of photonic devices and incorporate a new activation function called the Photonic Sigmoid, based on a semiconductor nonlinear optical module.
- Experimental results show that these optics-informed models outperform traditional ReLU-based configurations, achieving improved noise and chromatic dispersion compensation, with performance reaching below the Bit Error Rate (BER) limit for fiber lengths up to 42 km at 48 Gb/s.
We experimentally demonstrate the use of optical frequency combs (OFCs), generated by a photonic integrated circuit (PIC), in a flexible optical distribution network based on fiber-optics and free-space optics (FSOs) links, aimed at the fifth generation of mobile network (5G) Xhauls. The Indium Phosphide (InP) monolithically integrated OFC is based on cascaded optical modulators and is broadly tunable in terms of operating wavelength and frequency spacing. Particularly, our approach relies on applying the PIC in a centralized radio access network (C-RAN) architecture, with the purpose of optically generating two low-phase noise mm-waves signals for simultaneously enabling a 12.
View Article and Find Full Text PDFWe study the frequency chirp properties of graphene-on-silicon electro-absorption modulators (EAMs). By experimentally measuring the chirp of a 100 µm long single layer graphene EAM, we show that the optoelectronic properties of graphene induce a large positive linear chirp on the optical signal generated by the modulator, giving rise to a maximum shift of the instantaneous frequency up to 1.8 GHz.
View Article and Find Full Text PDFA novel InP monolithically integrated coherent transmitter has been designed, fabricated and tested. The photonic integrated circuit consists of a distributed Bragg reflector laser and a modified nested Mach-Zehnder modulator having tunable input power splitters. Back-to-back coherent transmission for PDM-QPSK signals is reported up to 10 Gbaud (40 Gb/s) using the integrated laser and up to 32Gbaud (128 Gb/s) using an external low phase noise laser.
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