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Equalization of a 10 Gbps IMDD signal by a small silicon photonics time delayed neural network

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Photonics Research 2023年第5期11卷 878-886页

作者： EMILIANO STAFFOLI MATTIA MANCINELLI PAOLO BETTOTTI lorenzo pavesi Nanoscience Laboratory Department of PhysicsUniversity of Trento38123 TrentoItaly

A small 4-channel time-delayed complex perceptron is used as a silicon photonic neural network(PNN)device to compensate for chromatic dispersion in optical fiber *** PNN device is experimentally tested with nonreturn-to-zero optical signals at 10 Gbps after propagation through up to 125 km optical fiber *** the learning phase,a separation-loss function is optimized in order to maximally separate the transmitted levels of 0s from the 1s,which implies an optimization of the *** of the PNN device shows that the excess losses introduced by the PNN device are compensated by the gain in the transmitted signal equalization for a link longer than 100 *** measured data are reproduced by a model that accounts for the optical link and the PNN *** allows simulating the network performances for higher data rates,where the device shows improvement with respect to the benchmark both in terms of performance and ease of use.

关键词： network signal neural

Silicon nanocrystals to enable silicon photonics

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Chinese Optics Letters 2009年第4期7卷 319-324页

作者： lorenzo pavesi Nanoscience Laboratory Department of PhysicsUniversity of Trento

Low dimensional silicon, where quantum size effects play significant roles, enables silicon with new photonic functionalities. In this short review, we discuss the way that silicon nanocrystals are produced, their optoelectronic properties and a few device applications. We demonstrate that low dimensional silicon is an optimum material for developing silicon photonics.

关键词： Nanocrystals Photonic devices

Do different kinds of photon-pair sources have the same indistinguishability in quantum silicon photonics?

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Photonics Research 2023年第11期11卷 1820-1837页

作者： JONG-MOO LEE ALESSIO BALDAZZI MATTEO SANNA STEFANO AZZINI JOON TAE AHN MYUNG-LAE LEE YOUNGIK SOHN lorenzo pavesi Electronics and Telecommunications Research Institute(ETRI) Daejeon 34129Republic of Korea Department of Physics University of Trento38123 TrentoItaly Korea Advanced Institute of Science and Technology(KAIST) Daejeon 34141Republic of Korea

In the same silicon photonic integrated circuit,we compare two types of integrated degenerate photon-pair sources(microring resonators and waveguides)using Hong–Ou–Mandel(HOM)interference *** nominally identical microring resonators are coupled to two nominally identical waveguides,which form the arms of a Mach–Zehnder *** is pumped by two lasers at two different wavelengths to generate,by spontaneous four-wave mixing,degenerate photon *** particular,the microring resonators can be thermally tuned in or out of resonance with the pump wavelengths,thus choosing either the microring resonators or the waveguides as photon-pair sources,*** this way,an on-chip HOM visibility of 94%with microring resonators and 99%with straight waveguides is measured upon *** compare our experimental results with theoretical simulations of the joint spectral intensity and the purity of the degenerate photon *** verify that the visibility is connected to the sources’indistinguishability,which can be quantified by the overlap between the joint spectral amplitudes(JSA)of the photon pairs generated by the two *** estimate a JSA overlap of 98%with waveguides and 89%with microring resonators.

关键词： interferometer pumped pump

Generation of quantum-certified random numbers using on-chip path-entangled single photons from an LED

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Photonics Research 2023年第9期11卷 1484-1499页

作者： NICOLÒ LEONE STEFANO AZZINI SONIA MAZZUCCHI VALTER MORETTI MATTEO SANNA MASSIMO BORGHI GIOELE PICCOLI MARTINO BERNARD MHER GHULINYAN lorenzo pavesi Department of Physics University of Trento38122 TrentoItaly Department of Mathematics and TIFPA University of Trento38122 TrentoItaly Department of Physics University of Pavia27100 PaviaItaly Centre for Sensors and Devices Fondazione Bruno Kessler38123 PovoItaly

Single-photon entanglement is a peculiar type of entanglement in which two or more degrees of freedom of a single photon are correlated quantum-mechanically. Here, we demonstrate a photonic integrated chip able to generate and manipulate single-photon path-entangled states, using a commercial red LED as light source.A Bell test, in the Clauser, Horne, Shimony, and Holt(CHSH) form, is performed to confirm the presence of entanglement, resulting in a maximum value of the CHSH correlation parameter equal to 2.605 ± *** allows us to use it as an integrated semi-device independent quantum random number generator able to produce certified random numbers. The certification scheme is based on a Bell’s inequality violation and on a partial characterization of the experimental setup, without the need of introducing any further assumptions either on the input state or on the particular form of the measurement observables. In the end a min-entropy of 33% is demonstrated.

关键词： quantum random inequality

Complete crossing of Fano resonances in an optical microcavity via nonlinear tuning

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Photonics Research 2017年第3期5卷 168-175页

作者： MARTINO BERNARD FERNANDO RAMIRO MANZANO lorenzo pavesi GEORG PUCKER IACOPO CARUSOTTO MHER GHULINYAN Centre for Materials and Microsystems Fondazione Bruno Kessler Department of Physics Nanoscience LaboratoryUniversity of Trento INO-CNR BEC Center and Department of Physics University of Trento

We report on the modeling, simulation, and experimental demonstration of complete mode crossings of Fano resonances within chip-integrated microresonators. The continuous reshaping of resonant line shapes is achieved via nonlinear thermo-optical tuning when the cavity-coupled optical pump is partially absorbed by the *** locally generated heat then produces a thermal field, which influences the spatially overlapping optical modes, allowing us to alter the relative spectral separation of resonances. Furthermore, we exploit such tunability to continuously probe the coupling between different families of quasi-degenerate modes that exhibit asymmetric Fano interactions. As a particular case, we demonstrate a complete disappearance of one of the modal features in the transmission spectrum as predicted by Fano [Phys. Rev. 124, 1866(1961)]. The phenomenon is modeled as a third-order nonlinearity with a spatial distribution that depends on the stored optical field and thermal diffusion within the resonator. The performed nonlinear numerical simulations are in excellent agreement with the experimental results, which confirm the validity of the developed theory.

关键词： in on of Complete crossing of Fano resonances in an optical microcavity via nonlinear tuning mode been that is

Intermodal four-wave mixing in silicon waveguides

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Photonics Research 2018年第8期6卷 805-814页

作者： STEFANO SIGNORINI MATTIA MANCINELLI MASSIMO BORGHI MARTINO BERNARD MHER GHULINYAN GEORG PUCKER lorenzo pavesi Department of Physics University of Trento SM Optics s.r.l. Research Programs Department of Information Engineering University of Brescia Centre for Materials and Microsystems Fondazione Bruno Kessler

In this work, we report the modeling and the experimental demonstration of intermodal spontaneous as well as stimulated four-wave mixing(FWM) in silicon waveguides. In intermodal FWM, the phase-matching condition is achieved by exploiting the different dispersion profiles of the optical modes in a multimode waveguide. Since both the energy and the wave vectors have to be conserved in the FWM process, this leads to a wide tunability of the generated photon wavelength, allowing us to achieve a large spectral conversion. We measured several waveguides that differ by their widths and demonstrate large signal generation spanning from the pump wavelength(1550 nm) down to 1202 nm. A suited setup evidences that the different waves propagated indeed on different order modes, which supports the modeling. Despite observing a reduced efficiency with respect to intramodal FWM due to the decreased modal overlap, we were able to show a maximum spectral distance between the signal and idler of 979.6 nm with a 1550 nm pump. Our measurements suggest the intermodal FWM is a viable means for large wavelength conversion and heralded photon sources.

关键词：四波混频通讯技术发展现状技术创新