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2. Design, Operation and BER Test of Multi-Gb/s Radiation-Hard Drivers in 65 nm Technology for Silicon Photonics Optical Modulators

Author

Ciarpi, G., Cammarata, S., Faralli, S., Velha, P., Magazzù, G., Palla, F., Saponara, Sergio, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Saponara, Sergio, editor, and De Gloria, Alessandro, editor

Published
2020
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3. Study of Low-Dose Long-Exposure Gamma Radiation Effects on InP DBR Cavity Lasers from Generic Integration Technology

Author

Gambini, F., Andriolli, N., Nurra, V., Chiesa, M., Petroni, F., Faralli, S., Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martin, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Saponara, Sergio, editor, and De Gloria, Alessandro, editor

Published
2019
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5. Preserving Utility in Fair Top-k Ranking with Intersectional Bias

Author

Boratto, L, Faralli, S, Marras, M, Stilo, G, Alimonda, N, Castelnovo, A, Crupi, R, Mercorio, F, Mezzanzanica, M, Alimonda, Nicola, Castelnovo, Alessandro, Crupi, Riccardo, Mercorio, Fabio, Mezzanzanica, Mario, Boratto, L, Faralli, S, Marras, M, Stilo, G, Alimonda, N, Castelnovo, A, Crupi, R, Mercorio, F, Mezzanzanica, M, Alimonda, Nicola, Castelnovo, Alessandro, Crupi, Riccardo, Mercorio, Fabio, and Mezzanzanica, Mario

Abstract

Ranking is required for many real applications, such as search, personalisation, recommendation, and filtering. Recent research has focused on developing reliable ranking algorithms that maintain fairness in their outcomes. However, only a few consider multiple protected groups since this extension introduces significant challenges. While useful in the research sector, considering only one binary sensitive feature for handling fairness is inappropriate when the algorithm must be deployed responsibly in real-world applications. Our work is built on top of Multinomial FA*IR, a Fair Top-k ranking with multiple protected groups, which we extend to provide users the option to balance fairness and utility, adapting the final ranking accordingly. Our experimental results show that alternative better solutions overlooked by Multinomial FA*IR may be found through our approach without violating fairness boundaries. The code of the implemented solution and the experiments are publicly available to the community as a GitHub repository.

Published
2023

9. Extracting, Mining and Predicting Users’ Interests from Social Media

Author

Zarrinkalam, F., Faralli, S., Piao, G., and Bagheri, E.

Subjects
Information sources, Representation model, User interest model, Preference elicitation techniques, Benchmark datasets, Evaluation methodologies, Social media platforms, User-generated content, Computer Science (miscellaneous), Information Systems
Published
2020
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10. Integration of Diagnostic Fiber Bragg Grating Sensors in Advanced Carbon Composite Materials

Author

Tozzetti, L., Gabardi, M., Faralli, S., Massimiliano SOLAZZI, Rajbhandari, S., Benedetti, D., Buttaro, G., and Di Pasquale, F.

Abstract

FBG sensors written by femtosecond laser pulses are embedded in carbon composite structures. A comparative analysis, supported by theory, points out the embedding process repeatability and the sensing technology effectiveness for structural health monitoring.

Published
2022
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13. Detecting Race and Gender Bias in Visual Representation of AI on Web Search Engines

Author

Boratto, Ludovico, Faralli, Stefano, Marras, Mirko, Stilo, Giovanni, Boratto, L ( Ludovico ), Faralli, S ( Stefano ), Marras, M ( Mirko ), Stilo, G ( Giovanni ), Makhortykh, Mykola, Urman, Aleksandra, Ulloa, Roberto, Boratto, Ludovico, Faralli, Stefano, Marras, Mirko, Stilo, Giovanni, Boratto, L ( Ludovico ), Faralli, S ( Stefano ), Marras, M ( Mirko ), Stilo, G ( Giovanni ), Makhortykh, Mykola, Urman, Aleksandra, and Ulloa, Roberto

Abstract

Web search engines influence perception of social reality by filtering and ranking information. However, their outputs are often subjected to bias that can lead to skewed representation of subjects such as professional occupations or gender. In our paper, we use a mixed-method approach to investigate presence of race and gender bias in representation of artificial intelligence (AI) in image search results coming from six different search engines. Our findings show that search engines prioritize anthropomorphic images of AI that portray it as white, whereas non-white images of AI are present only in non-Western search engines. By contrast, gender representation of AI is more diverse and less skewed towards a specific gender that can be attributed to higher awareness about gender bias in search outputs. Our observations indicate both the need and the possibility for addressing bias in representation of societally relevant subjects, such as technological innovation, and emphasize the importance of designing new approaches for detecting bias in information retrieval systems.

Published
2021

23. Er3+-doped BaY2F8 crystal waveguides for broadband optical amplification at 1.5 μm.

Author

Toccafondo, V., Cerqueira S., A., Faralli, S., Sani, E., Toncelli, A., Tonelli, M., and Di Pasquale, F.

Subjects
WAVEGUIDES, CRYSTALS, FINITE element method, METHODOLOGY, DATA, ABSORPTION, EMISSIONS (Air pollution), BANDWIDTHS, BASEBAND
Abstract

Integrated waveguide amplifiers based on high concentration Er3+ doped BaY2F8 crystals are numerically studied by combining a full-vectorial finite element based modal analysis and propagation-rate equations. Using realistic input data, such as the absorption/emission cross sections and Er level lifetimes measured on grown crystal samples, we investigate the amplifier performance by optimizing the total Er concentration. We predict optimum gain coefficient up to 5 dB/cm and broad amplification bandwidth exceeding 80 nm with 1480 nm pumping. [ABSTRACT FROM AUTHOR]

Published
2007
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24. Unsupervised, knowledge-free, and interpretable word sense disambiguation

Author

Panchenko, A., Marten, F., Ruppert, E., Faralli, S., Ustalov, D., Ponzetto, S. P., Biemann, C., Panchenko, A., Marten, F., Ruppert, E., Faralli, S., Ustalov, D., Ponzetto, S. P., and Biemann, C.

Abstract

Interpretability of a predictive model is a powerful feature that gains the trust of users in the correctness of the predictions. In word sense disambiguation (WSD), knowledge-based systems tend to be much more interpretable than knowledge-free counterparts as they rely on the wealth of manually-encoded elements representing word senses, such as hypernyms, usage examples, and images. We present a WSD system that bridges the gap between these two so far disconnected groups of methods. Namely, our system, providing access to several state-of-the-art WSD models, aims to be interpretable as a knowledge-based system while it remains completely unsupervised and knowledge-free. The presented tool features a Web interface for all-word disambiguation of texts that makes the sense predictions human readable by providing interpretable word sense inventories, sense representations, and disambiguation results. We provide a public API, enabling seamless integration. © 2017 Association for Computational Linguistics.

Published
2017

25. Bidirectional Transmission in an Optical Network on Chip With Bus and Ring Topologies

Author

Faralli, S., Gambini, Fabrizio, Pintus, P., Scaffardi, M., Liboiron-Ladouceur, O., Xiong, Y., Castoldi, P., and Di Pasquale, F.

Subjects
photonic integrated networks on chip (NoCs), Hardware_INTEGRATEDCIRCUITS, shared source-microring and shared destination-microring, adding or dropping two optical signals at the same wavelength in the same microring of NoCs with bus and ring topology, Hardware_PERFORMANCEANDRELIABILITY, simultaneous bidirectional transmissions
Abstract

In photonic integrated networks on chip (NoCs), microrings are commonly used for adding or dropping a single optical signal to be switched in the NoC. This paper demonstrates the feasibility of adding or dropping two optical signals at the same wavelength in the same microring of NoCs with bus and ring topology. More specifically, the same microring can be used to support simultaneous bidirectional transmissions of two signals to be coupled in the NoC topology, leading to two different configurations, called shared source-microring and shared destination-microring. Spectral characterization shows good agreement between simulations and measurements taken on silicon-based integrated NoC. Bit-error-rate (BER) measurements indicate that the shared sourcemicroring configuration performs better, achieving a penalty as low as 1.5 dB for a BER of 10 -9 at 10 Gb/s in the bus NoC. A higher penalty in the ring NoC for both configurations is due to higher crosstalk in the interconnecting ring

Published
2016
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26. [Er.sup.3+]-doped Ba[Y.sub.2][F.sub.8] crystal waveguides for broadband optical amplification at 1.5 [micro]m

Author

Toccafondo, V., S. A. Cerqueira, Jr., Faralli, S., Sani, E., Toncelli, A., Tonelli, M., and Di Pasquale, F.

Subjects
Broadband amplifiers -- Usage, Erbium -- Mechanical properties, Waveguides -- Analysis, Physics
Abstract

A full-vectorial finite element based modal analysis and propagation-rate equations are used to study the integrated waveguide amplifiers based on high concentration [Er.sup.3+] doped Ba[Y.sub.2][F.sub.8] crystals. The numerical results have predicted optimum gain coefficient up to 5 dB/cm and broad amplification bandwidth exceeding 80 nm with 1480 nm pumping.

Published
2007

35. A 40 Gb/s InP-monolithically integrated DPSK-demolulator enhanced by cross-gain-compensation in an SOA

Author

Bontempi, F., Faralli, S., Leijtens, X.J.M., Bolk, J., Contestabile, G., Andriolli, N., Bontempi, F., Faralli, S., Leijtens, X.J.M., Bolk, J., Contestabile, G., and Andriolli, N.

Abstract

We fabricated and experimentally tested a novel monolithically integrated Indium Phosphide optical circuit for differential phase-shift keying demodulation, which is robust to noise degradations of the received signal. The circuit consists of a one-bit-delay interferometer that demodulates the incoming signal and a semiconductor optical amplifier where the constructive and destructive demodulated outputs synchronously counter-propagate experiencing a reshaping effect. The novel optical circuit has been fabricated for 40 Gb/s signals, and the amplitude signal restoration is demonstrated by comparing the obtained output eye diagrams with those of a commercial fiber-based demodulator. We find a net improvement in the signal to noise ratio when the circuit is fed with a noisy input signal.

Published
2015

36. All-optical InP-monolithically integrated WDM regenerator for PoISK signals

Author

Andriolli, N., Faralli, S., Contestabile, G., Bolk, J., Leijtens, X.J.M., and Photonic Integration

Abstract

A monolithically integrated Indium Phosphide optical circuit performing WDM regeneration of Polarization Shift Keying signals is presented. The scheme is based on hardlimiting amplification in a saturated Semiconductor Optical Amplifier. A Q-factor improvement of around 2 is reported on two different wavelengths.

Published
2012

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