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This work presents the development of an optically controlled slot antenna, capable of operating at two different resonant frequencies, 2.5 GHz and 5.1 GHz. A silicon switch controls the frequency operation. The proposed antenna design was analyzed in terms of S-parameters and gain. Measured results show a difference of 20 dB for the reflection coefficient and 3 dB in the antenna gain, between the...
This paper reports the development of a dual-band slotted waveguide antenna array with orthogonal polarizations for dual-use radars. It can be applied for simultaneously enabling communications and tracking functions. The radiating structure is composed by two groups of slots milled into the waveguide opposite faces, allowing an antenna operation over two different frequency bands. Numerical results...
This work shows the concept, performance, and field-trials of the first photonics-based radar. The comparative in-field experiments in aerial and naval scenarios against a state-of-the-art commercial system show the photonics potentials in enabling software-defined radars.
In this paper, an all-optical fully-digital dual-band radar (DBR) is presented. The proposed radar architecture uses a single mode-locked laser for optically generating and receiving the RF signals, taking advantage of the high bandwidth and flexibility provided by the photonic technologies to simultaneously generate and detect two signals in the S and X bands. The use of a single laser reduces system...
The field trial results of the first photonics-based fully digital radar system are presented. The system has been developed in the PHODIR project, and is tested here in a real aerial scenario with non-cooperative targets. The innovative radar is described, and the results are presented and discussed.
The field trial results of the first photonics-based radar system in a real maritime environment are presented in this paper. The exploited prototype is the final outcome of the ERC-funded project PHODIR (PHOtonics-based fully DIgital Radar). The system exploits photonic technologies for both the generation and the detection of radar RF signals, allowing increased performance and an unprecedented...
The architecture of an innovative photonic assisted RF receiver for simultaneously filter, down-convert, and digitize received signals is presented. It allows the reception and analysis of RF signals up the mm-waves.
We report the first fully photonics-based radar demonstrator. Photonics enables flexibility, wide bandwidth, precision, leading to a fully digital radar paradigm. Field trial results targeting commercial airplanes prove its effectiveness as a proof of concept.
Novel architecture based on all-optical traffic grooming in optical node for elastic optical network is proposed. BER measurements experimentally demonstrate efficient adaptive switching and processing of variable fragmented traffic, leading to improved network scalability and efficiency.
In this paper, we propose and experimentally demonstrate simultaneous format and wavelength conversion of multiple fragmented signals suitable for gridless and multi-granular networks. Conversion of NRZ and large-RZ to short-RZ-OOK by means of a single commercial Quad SOA-MZI is demonstrated for grooming 85.4 Gb/s frame. The output RZ-OOK signal is suitable for further tributary multiplexing onto...
We demonstrate 40Gb/s operation without bit loss of an all-optical selective wavelength-shifter in a SOA-MZI enabling simultaneous wavelength-conversion and data erasing of data burst under a gate signal.
A monolithically integrated InP optical circuit performing current-controlled DPSK demodulation is reported. The circuit consists of an interferometric structure with a 1-bit delay SOA-amplified loop. Operation at 8 Gb/s in C-band is reported.
A monolithically integrated InP optical device performing XOR between a bit sequence and one delayed copy (differential XOR) for encryption, scrambling, PRBS generation, and differential modulation format decoding is presented. Operation at 8/16/32Gbs is reported.
We analyze the process of software development for large, object oriented, open source software systems. Such systems may be described as complex networks when suitable variables are properly identified. In particular we model the system growth through a Yule process which enable us to fit data extracted from freely available repositories. We consider quantities related to relevant properties of the...
In this research, we focus the attention on some of the most successful open source (OS) projects. We are interested in studying the characteristics of the social networks comprising these popular and mature OS developer communities. By examining developers mailing lists (MLs), we adopt some social network analysis (SNA) measures to evaluate interactions among community members. A knowledge of these...
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