Search

Your search keyword '"Gilardi, Giovanni"' showing total 44 results
Start Over Author "Gilardi, Giovanni"
44 results on '"Gilardi, Giovanni"'

1. Green Roof Benefits and Technology Assessment. A Literature Review

Author

Aguilar Fajardo, Astrid Carolina, Bacchi, Gabriela, Cusicanqui Lopez, Jorge Alexis, Gilardi, Giovanni, Maggetti, Damodar, Tommasi, Luca, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Calabrò, Francesco, editor, Della Spina, Lucia, editor, and Piñeira Mantiñán, María José, editor

Published
2022
Full Text
View/download PDF

2. 400 Gbps/λDP-16QAM O-band Link with SiP TX and RX PICs using only Heterogeneously Integrated Lasers and SOAs for Optical Gain

Author

Misak, Stephen, primary, Wissing, Aaron, additional, Zhang, Jinsong, additional, Wei, Zixian, additional, Liu, Junqian, additional, Andrade, Hector, additional, Maharry, Aaron, additional, Gilardi, Giovanni, additional, Kumar, Ranjeet, additional, Su, Guan-Lin, additional, Liu, Ansheng, additional, Akulova, Yuliya, additional, Buckwalter, James F., additional, Saleh, Adel A. M., additional, Coldren, Larry, additional, Plant, David V., additional, and Schow, Clint L., additional

Published
2024
Full Text
View/download PDF

3. First Demonstration of 200-G Coherent PON at O-band with Heterogeneously-Integrated SiP Tx and Rx with Lasers

Author

Zhang, Jinsong, primary, Wei, Zixian, additional, Misak, Stephen, additional, Wissing, Aaron, additional, Liu, Junqian, additional, Andrade, Hector, additional, Maharry, Aaron, additional, Gilardi, Giovanni, additional, Kumar, Ranjeet, additional, Su, Guan-Lin, additional, Liu, Ansheng, additional, Akulova, Yuliya, additional, Buckwalter, James F., additional, Saleh, Adel A. M., additional, Coldren, Larry, additional, Schow, Clint L., additional, and Plant, David V., additional

Published
2024
Full Text
View/download PDF

5. Advancements in heterogeneously integrated silicon photonics for IMDD and coherent data transmission

Author

Akulova, Yuliya, primary, Jones, Richard, additional, Nguyen, Kimchau, additional, Venables, Ranju, additional, Doussiere, Pierre, additional, Liu, Ansheng, additional, Gilardi, Giovanni, additional, Huang, Mengyuan, additional, Patel, David, additional, Yu, Haijiang, additional, Fathololoumi, Saeed, additional, Zhu, Daniel, additional, Mahalingam, Hari, additional, Su, Tiehui, additional, Seddighian, Pegah, additional, Malouin, Christian, additional, Lin, Wenhua, additional, Wang, Ye, additional, Al-Hemyari, Kadhair, additional, and Snow, Eric, additional

Published
2023
Full Text
View/download PDF

6. A 224 Gbps/λ O-Band Coherent Link for Intra-Data Center Applications

Author

Maharry, Aaron, primary, Misak, Stephen, additional, Andrade, Hector, additional, Liu, Junqian, additional, Gilardi, Giovanni, additional, Liao, Sean, additional, Liu, Ansheng, additional, Akulova, Yuliya, additional, Coldren, Larry, additional, Buckwalter, James F., additional, and Schow, Clint L., additional

Published
2023
Full Text
View/download PDF

7. First Demonstration of an O-Band Coherent Link for Intra-Data Center Applications

Author

Maharry, Aaron, Liu, Junqian, Misak, Stephen, Andrade, Hector, Valenzuela, Luis A., Gilardi, Giovanni, Liao, Sean, Liu, Ansheng, Akulova, Yuliya, Coldren, Larry, Buckwalter, James F., and Schow, Clint L.

Abstract

We report the first demonstration of a full O-band coherent link for intra-data center applications, including custom photonic and electronic integrated circuits for the transmitter and receiver. Full-link 112 Gbps (56 Gbaud QPSK) transmission is shown with $2.1\cdot 10^{-4}$ measured BER, and record baud rate 128 Gbps (64 Gbaud QPSK) transmission is shown for the stand-alone coherent transmitter. The link architecture is based on analog coherent detection (ACD), which improves power consumption substantially by performing functions in the analog domain that are normally implemented with power-hungry digital signal processing (DSP). Energy efficiency of 9.5 pJ/bit is demonstrated for the O-band coherent link, with 12.5 pJ/bit expected with next-generation circuits that include integrated optical gain. These results show the potential for next-generation data center networks based on low-power O-band coherent links.

Published
2023
Full Text
View/download PDF

12. Simultaneous full C‐band tuning of three integrated DS‐DBR lasers in presence of strong thermal crosstalk

Author

Yao, Weiming, Gilardi, Giovanni, Smit, Meint K., Wale, Michael J., and Photonic Integration

Abstract

Digital supermode DBR (DS-DBR) lasers are an attractive light source for WDM transmitter systems as they show continuous tuning capability in the full C-band and are compatible with monolithic integration [1]. It is thus desirable to place an array of DS-DBR lasers within a photonic integrated circuit (PIC) for multi-channel operation. However, thermal crosstalk in such a PIC can pose a severe problem that degrades laser performance and limits integration density. It has been shown in [2] that thermal effects between sections of a ...

Published
2015

14. Lightwave planar circuits based on organic materials for filtering and sensing

Author

Gilardi, Giovanni and d'Alessandro, Antonio

Subjects
Ingegneria industriale e dell'informazione [Settori Disciplinari MIUR], all optical, In fiber optical charcterization of devices, Liquid crystals, Clean room fabrication, Bragg filters, Physics::Optics, Settori Disciplinari MIUR::Ingegneria industriale e dell'informazione, whispering gallery modes, Free space optical charcterization of devices
Abstract

This thesis investigates in detail optical filters based on two phenomena and their applicability in photonics devices. The first phenomenon is called Whispering gallery modes, discovered in 1912 from Lord Rayleigh. The second phenomenon investigated in this thesis is the Braggs’s law, to develop optical filters.

Published
2012

18. Plasmon resonance optical tuning based on photosensitive composite structures

Author

Gilardi, Giovanni, Xiao, Sanshui, Mortensen, N. Asger, d'Alessandro, Antonio, Beccherelli, Romeo, Gilardi, Giovanni, Xiao, Sanshui, Mortensen, N. Asger, d'Alessandro, Antonio, and Beccherelli, Romeo

Abstract

This paper reports a numerical investigation of a periodic metallic structure sandwiched between two quartz plates. The volume comprised between the quartz plates and the metallic structure is infiltrated by a mixture of azo-dye-doped liquid crystal. The exposure to a low power visible light beam modifies the azo dye molecular configuration, thus allowing the wavelength shift of the resonance of the system. The wavelength shift depends on the geometry of the periodic structure and it also depends on the intensity of the visible light beam.

Published
2014

22. An introduction to InP-based generic integration technology

Author

Smit, Meint, primary, Leijtens, Xaveer, additional, Ambrosius, Huub, additional, Bente, Erwin, additional, van der Tol, Jos, additional, Smalbrugge, Barry, additional, de Vries, Tjibbe, additional, Geluk, Erik-Jan, additional, Bolk, Jeroen, additional, van Veldhoven, Rene, additional, Augustin, Luc, additional, Thijs, Peter, additional, D’Agostino, Domenico, additional, Rabbani, Hadi, additional, Lawniczuk, Katarzyna, additional, Stopinski, Stanislaw, additional, Tahvili, Saeed, additional, Corradi, Antonio, additional, Kleijn, Emil, additional, Dzibrou, Dzmitry, additional, Felicetti, Manuela, additional, Bitincka, Elton, additional, Moskalenko, Valentina, additional, Zhao, Jing, additional, Santos, Rui, additional, Gilardi, Giovanni, additional, Yao, Weiming, additional, Williams, Kevin, additional, Stabile, Patty, additional, Kuindersma, Piet, additional, Pello, Josselin, additional, Bhat, Srivathsa, additional, Jiao, Yuqing, additional, Heiss, Dominik, additional, Roelkens, Gunther, additional, Wale, Mike, additional, Firth, Paul, additional, Soares, Francisco, additional, Grote, Norbert, additional, Schell, Martin, additional, Debregeas, Helene, additional, Achouche, Mohand, additional, Gentner, Jean-Louis, additional, Bakker, Arjen, additional, Korthorst, Twan, additional, Gallagher, Dominic, additional, Dabbs, Andrew, additional, Melloni, Andrea, additional, Morichetti, Francesco, additional, Melati, Daniele, additional, Wonfor, Adrian, additional, Penty, Richard, additional, Broeke, Ronald, additional, Musk, Bob, additional, and Robbins, Dave, additional

Published
2014
Full Text
View/download PDF

25. Tunable integrated optical filters based on sapphire microspheres and liquid crystals

Author

Sennaroğlu, Alphan (ORCID 0000-0003-4391-0189 & YÖK ID 23851), Gilardi, Giovanni; Yılmaz, Hasan; Sharif, Murib Mohammed; Asquini, Rita; D'Alessandro, Antonio; Beccherelli, Romeo, College of Sciences, Department of Physics, Sennaroğlu, Alphan (ORCID 0000-0003-4391-0189 & YÖK ID 23851), Gilardi, Giovanni; Yılmaz, Hasan; Sharif, Murib Mohammed; Asquini, Rita; D'Alessandro, Antonio; Beccherelli, Romeo, College of Sciences, and Department of Physics

Abstract

We present an integrated optical narrowband electrically tunable filter based on the whispering gallery modes of sapphire microspheres and double ion-exchanged channel BK7 glass waveguides. Tuning is provided by a liquid crystal infiltrated between the spheres and the glass substrate. By suitably choosing the radii of the spheres and of the circular apertures, upon which the spheres are positioned, arrays of different filters can be realized on the same substrate with a low cost industrial process. We evaluate the performance in terms of quality factor, mode spacing, and tuning range by comparing the numerical results obtained by the numerical finite element modeling approach and with the analytical approach of the Generalized Lorenz-Mie Theory for various design parameters. By reorienting the LC in an external electrical field, we demonstrate the tuning of the spectral response of the sapphire microsphere based filter. We find that the value of the mode spacing remains nearly unchanged for the different values of the applied electric field. An increase of the applied electric field strength, changes the refractive index of the liquid crystal, so that for a fixed geometry the mode spacing remains unchanged., NA

Published
2010

33. Experimental and Numerical Study of Electrical Crosstalk in Photonic-Integrated Circuits.

Author

Weiming Yao, Gilardi, Giovanni, Calabretta, Nicola, Smit, Meint K., and Wale, Michael J.

Abstract

This paper presents measurement results on electrical crosstalk between interconnect lines and electro-optical phaseshifters in photonic-integrated circuits. The results indicate that overall crosstalk originates from radiative and substrate coupling between lines and from shared ground connections. The latter is the main noise source in the structures measured in this paper and keeps crosstalk above -25 dB for interconnects and above -20 dB for phase-shifters independent of coupling distance. Measurements on the effect of electrical crosstalk on optical modulation show that -20 dB of coupling degrades modulation performance significantly, leading to at least 2-dB power penalty. A simulation approach is presented that reproduces the experimental results and gives insight into crosstalk mechanisms. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

34. Deep Trenches for Thermal Crosstalk Reduction in InP-Based Photonic Integrated Circuits.

Author

Gilardi, Giovanni, Weiming Yao, Rabbani Haghighi, Hadi, Leijtens, Xaveer J. M., Smit, Meint K., and Wale, M. J.

Abstract

We numerically and experimentally investigate an on-chip solution to reduce the thermal crosstalk in indium phosphide-based photonic integrated circuits. We introduce deep trenches, fabricated through wet etch, between active and passive components. The current injected in active components and the geometry of the trenches are the parameters considered in our analysis. The trenches thermally isolate the passive components from the heat generated by active components. The thermal crosstalk is quantified by measuring the effects on the electro-optical response of an MZ modulator considered as a test structure. The heat sources are represented by semiconductor optical amplifiers placed at different distances with respect to the position of the MZ. Our experiments show how both the geometry and the position of the trenches, play a role in the reduction of the thermal crosstalk. [ABSTRACT FROM PUBLISHER]

Published
2014
Full Text
View/download PDF

37. Carriage of group B Streptococcus in pregnant women and newborns: a 2-year study at Perugia General Hospital

Author

Sensini, Alessandra, primary, Tissi, Luciana, additional, Verducci, Nadia, additional, Orofino, Maristella, additional, Hunolstein, Christina von, additional, Brunelli, Bruno, additional, Malà, Gian Luca, additional, Perocchi, Fausto, additional, Brunelli, Roberta, additional, Lauro, Vincenzo, additional, Ferrarese, Remo, additional, and Gilardi, Giovanni, additional

Published
1997
Full Text
View/download PDF

39. Carriage of group B Streptococcusin pregnant women and newborns: a 2-year study at Perugia General Hospital

Author

Sensini, Alessandra, Tissi, Luciana, Verducci, Nadia, Orofino, Maristella, Hunolstein, Christina von, Brunelli, Bruno, Malà, Gian Luca, Perocchi, Fausto, Brunelli, Roberta, Lauro, Vincenzo, Ferrarese, Remo, and Gilardi, Giovanni

Abstract

Objective:To study the prevalence of group B Streptococcus(GBS) colonization in pregnant women and their newborns at Perugia General Hospital.

Published
1997
Full Text
View/download PDF

42. Integrated Bragg reflectors in low-index media: enabling strategies for wavelength tunability in electro-optic liquid crystals.

Author

Asquini, Rita, Gilardi, Giovanni, d'Alessandro, Antonio, and Assanto, Gaetano

Subjects
*BRAGG gratings, *LIQUID crystals, *OPTOELECTRONIC devices, *ELECTRODES, *REFRACTIVE index, *SPECTRUM analysis
Abstract

This paper reports two configurations of Bragg reflectors based on liquid crystals confined between two small glass plates. Both approaches employ the efficient electro-optic effect in liquid crystals, which allows tunability of the reflectors by using low voltages. The molecular reorientation induced by an applied electric field implies a refractive index modulation seen by polarized light propagating into the liquid crystal. We show design criteria and profile optimization of the electrodes to induce a liquid crystal refractive index periodic modulation, providing a wavelength selective propagation of confined light in the liquid crystal. The two proposed device configurations differ for the top-bottom electrode configuration in one case and coplanar electrodes in the other case. Modeling of both configurations has been carried by calculating the applied electric field distribution and its interaction with the liquid crystal elastic properties taking into account the boundary conditions due to the alignment layer on the inner faces of the glass substrates. The calculated performance in terms of high wavelength selectivity and ultrawide spectral tuning range indicate that the two designed structures can be proposed for both optical filtering and to produce novel low power integrated distributed feedback resonators in dense wavelength division multiplexed fiber optic systems. [ABSTRACT FROM AUTHOR]

Published
2011
Full Text
View/download PDF

43. Integrated Bragg reflectors in low-index media: enabling strategies for wavelength tunability in electro-optic liquid crystals

Author

Antonio d'Alessandro, Gaetano Assanto, Rita Asquini, Giovanni Gilardi, Asquini, Rita, Gilardi, Giovanni, D'Alessandro, Antonio, and Assanto, Gaetano

Subjects
liquid crystals, electro-optics, integrated optics, waveguides, tunable filters, bragg gratings, Materials science, Optical fiber, business.industry, General Engineering, Physics::Optics, Polarization (waves), Electro-optics, Atomic and Molecular Physics, and Optics, law.invention, Wavelength, Resonator, Optics, Liquid crystal, law, Electric field, Optoelectronics, business, Refractive index
Abstract

This paper reports two configurations of Bragg reflectors based on liquid crystals confined between two small glass plates. Both approaches employ the efficient electro-optic effect in liquid crystals, which allows tunability of the reflectors by using low voltages. The molecular reorientation induced by an applied electric field implies a refractive index modulation seen by polarized light propagating into the liquid crystal. We show design criteria and profile optimization of the electrodes to induce a liquid crystal refractive index periodic modulation, providing a wavelength selective propagation of confined light in the liquid crystal. The two proposed device configurations differ for the top-bottom electrode configuration in one case and coplanar electrodes in the other case. Modeling of both configurations has been carried by calculating the applied electric field distribution and its interaction with the liquid crystal elastic properties taking into account the boundary conditions due to the alignment layer on the inner faces of the glass substrates. The calculated performance in terms of high wavelength selectivity and ultrawide spectral tuning range indicate that the two designed structures can be proposed for both optical filtering and to produce novel low power integrated distributed feedback resonators in dense wavelength division multiplexed fiber optic systems.

Published
2011

44. Widely tunable electro-optic distributed Bragg reflector in liquid crystal waveguide

Author

Giovanni Gilardi, Gaetano Assanto, Antonio d'Alessandro, Rita Asquini, Gilardi, Giovanni, Asquini, Rita, D'Alessandro, Antonio, and Assanto, Gaetano

Subjects
Materials science, business.industry, Physics::Optics, Equipment Design, Grating, Distributed Bragg reflector, Coupled mode theory, Atomic and Molecular Physics, and Optics, Liquid Crystals, Equipment Failure Analysis, Photometry, Condensed Matter::Soft Condensed Matter, Refractometry, Optics, Fiber Bragg grating, Liquid crystal, Wavelength-division multiplexing, Electrode, Computer-Aided Design, Optoelectronics, Electronics, business, Refractive index
Abstract

We propose and numerically investigate a versatile and easy-to-realize configuration for a guided-wave voltage-tunable distributed feedback grating based on reorientation in nematic liquid crystal and coplanar comb electrodes. The device has a wide tuning range exceeding 100 nm and covers C and L bands for wavelength division multiplexing. (C) 2010 Optical Society of America

Published
2010

Catalog

Books, media, physical & digital resources
See catalog results