Technical Program


Plenary 2

9:00 to 12:40 / Auditorium

Cleber, Thiago Alegre



From Nonlinear Optics to High-Intensity Laser Physics

Donna Strickland

9:00 to 9:45  ·  Auditorium

The laser increased the intensity of light that can be generated by orders of magnitude and thus brought about nonlinear optical interactions with matter. Chirped pulse amplification, also known as CPA, changed the intensity level by a few more orders of magnitude and helped usher in a new type of laser-matter interaction that is referred to as high-intensity laser physics. In this talk, I will discuss the differences between nonlinear optics and high-intensity laser physics. The development of CPA and why short, intense laser pulses can cut transparent material will also be included. I will also discuss future applications.



Photonic Glass ceramics

Maurizio Ferrari

9:45 to 10:30  ·  Auditorium

Looking at the literature of the last years is evident that glass-based rare-earth-activated optical structures represent the technological pillar of a huge of photonic applications covering Health and Biology, Structural Engineering, Environment Monitoring Systems and Quantum Technologies. Since the pioneering work of Tick, Borrelli, Cornelius, and Newhouse on transparent glass ceramics performed in 1995, the research regarding photonic glass-ceramics is growing fast, covering a broad spectrum of applications. In the last years, we demonstrated that SiO2-SnO2 glass ceramics, presenting a strong absorption cross section in the UV range due to the SnO2 nanocrystal, are effective rare earth ions sensitizers. Another interesting property of the SiO2-SnO2...



Advances in Photonic Aperiodic Arrays and Circulators

Hugo Enrique Hernández Figueroa

10:30 to 11:15  ·  Auditorium

Due to their much lower losses photonic dielectric antennas are preferred, in several applications, instead of the metallic ones. However, their sizes are typically in the order of one wavelength, consequently, if single beamforming is needed, the use of aperiodic phased arrays capable of suppressing grating lobes is mandatory. On the other hand, the recent development of nonreciprocal materials without external magnetization may enable the design of compact integrated circulators. Such devices among other applications, allow the antennas to operate in the transceiver mode. In this talk, the research advances of these two key topics will be addressed in detail.


11:15 to 11:25




Photonics and the contribution to control microorganisms

Vanderlei Salvador Bagnato

11:25 to 11:55  ·  Auditorium

Using light as the main element, and photo-reactions as actions, it is possible to develop several techniques that allow microbiological control. From the treatment of infections external to the body, through internal infections to the preparation of organs for transplantation, these are realities within photonics today. In this presentation, we will review the work carried out by the Center for Optics and Photonics at IFSC – University of São Paulo



Extreme Light Scattering

Donald Umstadter

11:55 to 12:40  ·  Auditorium

We discuss the physics and applications of nonlinear Thomson scattering. When high intensity laser light (~1018 W/cm2) scattered with electrons, the degree of polarization of the scattered light was found to depend on its intensity level. This has implications for recent tests of cosmological theories based on the polarization of the cosmic microwave background. At higher intensity (~1021 W/cm2), a novel x-ray generation mechanism was demonstrated, namely high-order multiphoton Thomson scattering (n > 500).1 Nonlinear Thomson scattering was also predicted theoretically to measure the pulse duration of attosecond electron bunches.2 A compact all-laser-driven x-ray source with synchrotron quality and gamma-ray energy was developed, based on Thomson...

Lunch Break

Technical Session 1

14:30 to 17:10 / Hall A

Lasers 1

Edison Maldonado (ITA)

14:30 to 15:40 / Hall A



Laser wakefield electron accelerator: possible use for radioisotope production

Invited Paper

Nilson Dias Vieira Junior (IPEN); Edison Puig Maldonado (ITA); Alexandre Bonatto (UFCSPA); Roger Pizzato Nunes (UFRGS); Sudeep Banerjee (Arizona State University); Frederico Antonio Genezini (IPEN); Mauricio Moralles (IPEN); Armando V. F. Zuffi (IPEN); Ricardo E. Samad (IPEN)

14:30 to 15:00  ·  Hall A

Recently, lasers with peak power on the TW level operating at 1 kHz have been used to produce quasimonoenergetic electron beams with good quality and energy in the 15 MeV range, by laser wakefield acceleration (LWFA). Due to the fast growth of the repetition rates of this class of lasers, practical applications such as the production of gamma rays to initiate photofission nuclear reactions, in order to produce medical systems, capable of matching the resonant acceleration conditions (few-fs, several-mJ pulses), are now available.



Development of a modified Mach-Zehnder interferometer for time and space density measurements for laser wakefield acceleration

Armando V. F. Zuffi (IPEN); Edison P. Maldonado (ITA); Nilson Vieira (IPEN); Ricardo E. Samad (IPEN)

15:00 to 15:20  ·  Hall A

This work reports the development of a modified Michelson interferometer aimed at determining the density of gas targets and laser generated plasmas, in time and space. This interferometer will compose our laboratory implementations for laser wakefield acceleration, allowing the characterizations of gas jet profiles generated by submillimeter nozzles. The technique also allows us to estimate the temporal evolution of the plasma density.



Development of dielectric de Laval nozzles for laser electron acceleration by ultrashort pulses micromachining

Bruno Britto Chiomento (IPEN); Ricardo E. Samad (IPEN); Fabio Tabacow (IPEN); Armando V. F. Zuffi (IPEN); Edison P. Maldonado (ITA); Nilson Vieira (IPEN)

15:20 to 15:40  ·  Hall A

This work reports the development and experimental implementation of a methodology for manufacturing sub millimetric de Laval nozzles by ultrashort laser pulses micromachining by trepanning. The use of a ceramic substrate resulted in the fabrication of nozzles with high circularity and low roughness, which should generate high-quality gas targets for accelerating electrons with ultrashort laser pulses.

15:40 to 16:00


Lasers 2

Ricardo Samad (IPEN)

16:00 to 17:10 / Hall A



Synchrotron infrared nanospectroscopy as a game changer in nanophotonics

Invited Paper

Raul de Oliveira Freitas (National Synchrotron Light Laboratory (LNLS), Br)

16:00 to 16:30  ·  Hall A

Modern technological applications share a variety of common demands, especially the need for smaller functional devices operating with unprecedented data processing power. Hence, nanoscale devices for light traffic are promising candidates for that end. Therefore, a set of advances are required to drive research into real-world applications in this area, including disruptive advances in the available characterization tools. This work presents an overview of how synchrotron infrared nanospectroscopy has contributed to the progress of nanophotonics. Technique description, data processing, and recent studies highlight the uniqueness of the technique for accessing nano-optical phenomena in novel quantum materials.



Measurements of spin-coherence in NV centers for diamond-based quantum sensors

Lucas N. S. de Andrade (USP); Charlie O. Oncebay Segura (Universidad Nacional de INgeniería, Peru); Sergio R. Muniz (USP)

16:30 to 17:00  ·  Hall A

One of the biggest challenges to implement quantum protocols and quantum information processing (QIP) is achieving long coherence times, usually requiring systems ultra low temperatures. The nitrogen-vacancy (NV) center in diamond is a promising alternative to this general problem. Due to its spin properties, easy manipulation, and the possibility to do optical state initialization and readout, it quickly became one of the best solid-state spin system for QIP at room temperature. Here, we present the characterization of the spin-coherence of an ensemble of NV centers in engineered sample of ultrapure diamond, as a testbed for quantum protocols for quantum metrology.



Generating arbitrary laser beam shapes through phase-mapped designed beam splitting

Pedro Silva (USP); Sergio R. Muniz (USP)

17:00 to 17:20  ·  Hall A

This paper describes a method to generate high-definition arbitrary laser beam shapes and optical potentials. The phase contrast between a binary diffraction grating and the target intensity distribution is encoded on a spatial light modulator to control the splitting of light, enabling to produce very sharp, speckles-free and smooth images at the target plane. Besides its simplicity, not requiring any additional phase-plates, this technique provides a straightforward way to encode images onto phase-only masks, through direct pixel mapping, allowing for simpler feedback schemes to correct and control light distributions and optical potentials in real-time.

Technical Session 2

14:30 to 17:10 / Hall B

Integrated Photonics and Optoelectronics 1

Gustavo Wiederhecker (Unicamp)

14:20 to 15:40 / Hall B



New Opportunities with Old Materials

Invited Paper

Marko Loncar (Harvard College)

14:20 to 15:00  ·  Hall B

Lithium niobate (LN) is an “old” material with many applications in optical and microwave technologies, owing to its strong electro-optic (EO) coefficient, second order nonlinearity, and piezoelectricity. Conventional – discrete – LN components, the workhorse of the optoelectronic industry for many decades, are reaching their limits, however. I will discuss the development of integrated LN photonic platform aimed at applications in optical communications (classical and quantum) and microwave photonics. Examples include high-performance (EO) modulators, EO and Kerr frequency combs, ad frequency converters.

Diamond is another “old” material with remarkable properties! It is transparent from the ultra-violet to infrared, has a high refractive index,...



Optical Grating Coupling on Silicon Photonics based on Metallized Angle-Polished Fibers

Luis Gustavo Riveros (CPqD/Unicamp); Felipe Lorenzo Della Lucia (CPqD); Yesica Rumaldo Bustamante (CPqD); Hening Andrade (Unicamp); Tiago Sutili ((CPqD); Rafael C. Figueiredo (CPqD)

15:00 to 15:20  ·  Hall B

This paper describes an optical coupling method based on angle polished fiber for grating couplers on silicon photonics. Compared with classic coupling methods, this approach minimizes the difficulty of alignment accuracy and facilitates the packaging between devices and waveguides. The procedures to obtain the polishing angle to improve coupling, metallization of the fiber surface to increase reflectivity, and experimental measurement of insertion loss are described. The results show that the polished fiber coupling method increases insertion loss by only 0.8 dB when compared to the standard grating coupler vertical coupling.



Study of mechanically exfoliated monolayer, bilayer, trilayer and multilayer graphene as saturable absorber for passive Erbium-doped fiber laser mode-locking

Filipe de Freitas (Mackenzie); David Steiberg (Mackenzie); Thoroh de Souza (Mackenzie)

15:20 to 15:40  ·  Hall B

Using different samples of mechanically exfoliated graphene as saturable absorber in Erbium-doped fiber laser, we identified a transition in the mode-locking starting mechanism from non-self-starting (with monolayer or bilayer graphene) to self-starting (with trilayer or multilayer graphene) which is a strong indicative of fast-to-slow saturable-absorption response dependence on the number of graphene layers.

15:40 to 16:00


Integrated Photonics and Optoelectronics 2

Thiago Alegre (Unicamp)

16:00 to 17:10 / Hall B



Optical properties of 2D materials and potential applications for integrated photonics

Invited Paper

Christiano José Santiago de Matos (Mackgraphe)

16:00 to 16:30  ·  Hall B

In this talk, I will review our recent work on the optical characterization of various 2D materials, with emphasis on the nonlinear optical characterization, and discuss their potential to add functionality to integrated photonic devices.



Solar harvesting with nanofluids of Ag-Nanocubes

Glauciyevenn Guimarães (UFRPE); Caio V. P. Vital (UFPE); Francisco Eroni (UFPI); Antonio Melo (IFPI); Diego Rativa (UPE)

16:30 to 16:50  ·  Hall B

Metallic nanoparticles have shown great potential to efficiently convert solar radiation into thermal energy; therefore, there is a relationship between the normal oscillation mode of the free electrons of these nanoparticles and the frequency of an incident electric field. We explored the feasibility of using a nanofluid containing silver nanoparticles, through computer simulations, using the comsol software and to corroborate this, we also made experimental analyzes using a solar simulator. Therefore, we realized that the nanofluid has the potential to be applied in solar collectors, as it has the characteristics of a solar radiation absorber.



Compact grating coupler array for multicore fiber fabricated with DUV lithography

Lucas G. Rocha (Unicamp); Julian Pita (Unicamp); Lucas H. Gabrielli (Unicamp)

16:50 to 17:10  ·  Hall B

Using Space-Division Multiplexing (SDM) through multicore optical fibers (MCFs) can significantly increase the transmission capacity. However, compatibility with silicon photonics, a promising technology for compact, low-cost and power-efficient devices, requires integration between the two platforms. Using uniform grating couplers combined with compact tapers, two arrays -for vertical and 10°- were designed, fabricated and experimentally characterized. Simulations indicate coupling efficiencies of −4,64dB and −3,64dB for the 0° and 10° couplers, respectively, with bandwidths of 66,5nm and 127,3nm. Experimental results yielded efficiencies of −6,8dB for both designs, and corresponding bandwidths of 46,8nm and 90nm.

Tutorial Session 1

14:30 to 16:55 / Hall C

Sensors, Image and Illumination

Daniel Varela (USP)

14:30 to 16:55 / Hall C



Sensors based on plasmonic devices and nanostructures, Part 1

Isabel C. S. Carvalho (PUC-Rio)

14:30 to 15:15  ·  Hall C

Plasmonic devices and nanoparticles have been widely used in the last decades for the development of optical sensors with application in different scientific areas, spanning from biology to material science. In this tutorial, we will show the state of art of plasmonic sensors based on both Localized Surface Plasmon Resonance (LSPR) ( Part1) and Surface Plasmon Polariton (SPP) (Part 2) applied to (bio-)molecular interactions, radiation sensing and characterization of organic and nanoparticle thin films


15:15 to 15:20




Sensors based on plasmonic devices and nanostructures, Part 2

Tommaso Del Rosso (PUC-Rio)

15:20 to 16:05  ·  Hall C

Plasmonic devices and nanoparticles have been widely used in the last decades for the development of optical sensors with application in different scientific areas, spanning from biology to material science. In this tutorial, we will show the state of art of plasmonic sensors based on both Localized Surface Plasmon Resonance (LSPR) ( Part1) and Surface Plasmon Polariton (SPP) (Part 2) applied to (bio-)molecular interactions, radiation sensing and characterization of organic and nanoparticle thin films.


16:05 to 16:10




Nanofluids for Direct Absorption Solar Collector and Solar Desalination

Diego Rativa (UPE)

16:10 to 16:55  ·  Hall C

The amount of energy radiated by the sun in one hour is much higher than the energy used by all human beings in a year. The average annual horizontal radiation in the Brazilian semi-arid region is more than 2,000 kWh/m2, which, together with low precipitations, convert the region into the most populous dry region of the earth, where making the threat to water a constant factor due to droughts' repeated occurrence. Solar collectors are simple devices that usually employ a fluid circulating in a network of tubes working as heat receptors. One way to enhance the energy transfer efficiency is to use a working fluid with optical properties to directly absorb the solar radiation, usually called Direct Solar Absorption Collector (DSAC). In the last decade,...

Tutorial Session 2

14:30 to 16:55 / Hall D

Optical Communication

Darli A.A. Mello (Unicamp)

14:30 to 16:55 / Hall D



Advanced Forward Error Correction for Optical Fiber Communications

Vahid Aref (Nokia Bell Labs)

14:30 to 15:15  ·  Hall D

Forward Error Correction is an essential element of today’s digital communication systems to guarantee reliable data transmission. Modern high-speed optical communication systems require high-performing FEC engines with low power consumption that support throughput of multiples of 100 Gbit/s, achieving Net Coding Gains (NCGs) close to the theoretical Shannon limits at a target Bit Error Rate (BER) of 1e-15.

In this tutorial, we overview the state-of-the-art FEC schemes for fiber-optic communications, namely spatially coupled LDPC codes, oFEC and the staircase codes. The last two FEC schemes are already standardized for OpenZR+ and OIF 400G-ZR. We explain that these elaborate FEC schemes have a common feature leading to their high NCGs. They are...


15:15 to 15:20




Elastic Optical Networks

Helio Waldman (Unicamp)

15:20 to 16:05  ·  Hall D

In elastic optical networks (EON’s), the old fixed wavelength grid is replaced by a flexible grid of contiguous 12.5 GHz frequency slots. Each connection is assigned a tight integer number of such slots that is customized according to the requested bitrate and distance. A spectrally efficient modulation format is then chosen to provide connectivity with zero margin. <br><br> The motivation behind EON’s is the efficient use of optical spectrum. However, heterogeneity of the (bitrate, distance) demands over translucent networks means that rectangular objects with different shapes must now be dynamically assigned on a mesh of routes made from 320-slot links. Spectral fragmentation losses may then frustrate a large part of the gains awarded by...


16:05 to 16:10




Security in Optical Communication Systems: Data Encryption and Beyond

Marcelo L. F. Abbade (UNESP)

16:10 to 16:55  ·  Hall D

Opical communication systems (OCSs) are prone to a myriad of security threats, such as fiber cutting, tapping, and jamming. However, OCSs also provide appropriate conditions for the exchange of encryption keys by quantum-based approaches and for the emergence of signal encryption. Both these strategies may lead to unprecedented levels of security. In this paper, we present a brief review on the security menaces and opportunities related to OCSs. Encryption-based solutions receive special attention.

Poster Session 2

8:00 to 17:15 / Poster Session 2



Beam diameter evaluation of clinical equipments and its implication in therapeutic procedures

Carlos Eduardo Girasol (USP); Luciano Bachmann (USP); Rinaldo Guirro (USP)

8:00 to 17:15  ·  Poster Session 2

The objective was to evaluate and describe the diameter of the laser beam in different devices. Thus, nine different devices were recruited. The laser emitter diameters were collected using a detector sensitive to visible or infrared radiation. A Gaussian function was fitted after gauging, followed by non-linear regression to obtain beam radius, area, and diameter. This showed significant differences between the measured values and those indicated in the manufacturer's manual (45 to 595%). Thus, we conclude the need for frequent therapeutic laser equipment evaluations and a precise specification on beam parameters and data accuracy with the manufacturing companies.



Chemical composition depth profile of CO2 laser irradiated enamel

Carla Regina Albino (USP); Luismar B. Cruz Jr (USP); Juliana Jendiroba Faraoni (USP); Regina Palma-Dibb (USP); Luciano Bachmann (USP)

8:00 to 17:15  ·  Poster Session 2

The objective is to determine depth of modification of bovine dental enamel after irradiation with a CO2 laser with, emission at 10,600 nm and pulse width of 1 ms. The chemical composition was evaluated with an Infrared spectrometer. We measure the infrared absorption spectra of enamel at the surface and after progressive enamel wearing. Irradiating with 0.0089 J/cm2 observe a carbonate lost up to 1.25 microns, with 0.144 J/cm2 observe up to 1.75 microns and with 0.362 J/cm2 we observe a loss up to 2.25 microns depth. Microscopic images of irradiated enamel show a typical profile of a melted surface.



Optical properties in dental enamel: comparison of whitening agents with or without calcium

Denise M. Zezell (IPEN); Ludmila Mendonça (UFU); Carlos Soares (UFU); Augusto Fernandes (UFU); Adamo Monte (UFU); Luis Silva (UNIFESP)

8:00 to 17:15  ·  Poster Session 2

We emphasize the growth of interest in teeth whitening agents that are leading to a paradigm shift through continuous monitoring of their optical properties. The characteristics of commercial agents were investigated by monitoring the light absorption and scattering on bovine enamel fragments. The optical properties were provided by an integrating sphere. An increase of optical scattering in enamel after bleaching was observed in all analyzed samples. The use of calcium in the whitening gel did not reduce the scattering (p<0.05), calculated by fitting the spectra by the scattering equation model.



Effects of nanosecond high-intensity IR and UV lasers on dentin erosion/abrasion progression: a pilot-study

Elizabete Ferreia (UFABC); Patricia da Ana (UFABC)

8:00 to 17:15  ·  Poster Session 2

The irradiation of dental hard tissues with high-intensity lasers can make them more resistant to demineralization. Although many wavelengths have been studied, there are no research that evaluate the potential of short-pulsed Nd: YAG laser emitted in the infrared (1064nm) or ultraviolet (355nm) wavelength to prevent the progression of erosion lesions. This in vitro study evaluated the morphological and optical changes in eroded dentin promoted by such lasers. It was concluded that Nd: YAG lasers are effective in preventing the progression of dentin erosion/abrasion lesions in dentin; however, these effects are restricted to the first days of erosive/abrasive challenge.



Compositional changes promoted by Er, Cr: YSGG laser when used to inhibit dentin erosion

Denise M. Zezell (IPEN); Fabrizio Rodrigues (UFABC); Patricia da Ana (UFABC)

8:00 to 17:15  ·  Poster Session 2

Lasers are used for preventing demineralization, but there are no studies that report the compositional changes on root dentin irradiated with ErCrYSGG (2.78µm) laser in an erosive process. In this in vitro study, fifty dentin slabs were distributed in 5 groups to be treated with ErCrYSGG laser associated or not with application of acidulated phosphate fluoride gel (APF-gel); then, an erosion regime was conducted for 10 days and the composition changes were monitored by Fourier transform infrared spectroscopy. The data suggest a synergistic effect between laser irradiation and APF-gel, with a greater preventive effect when APF-gel was applied after irradiation.



Evaluation of the anti-caries effect beyond the critical enamel pH of preventive treatment of fluoride associated with Nd: YAG laser irradiation

Amanda Caramel-Juvino (IPEN); Thais Rabelo (IPEN); Nathalia Zanini (IPEN); Claudia Zamataro (IPEN); Denise M. Zezell (IPEN)

8:00 to 17:15  ·  Poster Session 2

This study aimed to evaluate the anti-caries effect of fluoride associated with Nd-YAG laser irradiation in the treatment of enamel. Eight groups (n = 5) were analyzed: Negative Control pH 4.5; Negative control pH 4; Fluoride pH 4.5; Fluoride pH 4; Nd-YAG pH 4.5; Nd-YAG pH 4; (Fluoride + Nd-YAG) pH 4.5 and (Fluoride + Nd-YAG) pH 4. All samples were analyzed by Scanning Electron Microscopy (SEM) before and after the cycle. Quantification of phosphorus in the cycling solutions was carried out using the colorimetric method, as an indication of enamel demineralization. The critical pH increases after Nd-YAG irradiation.



Backpropagation Neural Network for Analysis and Classification of Fluorescence Spectroscopy of Squamous Cell Carcinoma in Animal Model

João Marcelo Nogueira (USP); Marlon Rodrigues Garcia (USP); Michelle Barreto Requena (USP); Lilian Tan Moriyama (USP); Sebastião Pratavieira (USP); Daniel V> Magalhães (USP)

8:00 to 17:15  ·  Poster Session 2

The present study aims to evaluate the performance of a backpropagation neural network (BPNN) using the principal component analysis (PCA) of fluorescence spectra for discrimination between normal skin and skin tumor on mice. The fluorescence spectra were acquired from nude mice with induced squamous cell carcinoma (SCC). The artificial neural network (ANN) used in this study is a classical multiplayer feed-forward type with a back-propagation algorithm. The classification results show this technique as promising for healthy and unhealthy tissue classification. During the validation, the network classified 100% of the training set spectra and 90% of the test set.



Evaluation of machine learning models for the classification of breast cancer hormone receptors using micro-FTIR images

Moisés Oliveira Santos (IPEN); Matheus del Valle (IPEN); Sofia dos Santos (IPEN); Emerson Bernardes (IPEN); Denise Zezell (IPEN)

8:00 to 17:15  ·  Poster Session 2

The breast cancer is the most incident cancer in women. Evaluation of hormone receptors expression plays an important role to outline treatment strategies. FTIR spectroscopy imaging may be employed as an additional technique, providing extra information to help physicians. In this work, estrogen and progesterone receptors expression were evaluated using tumors biopsies from human cell lines inoculated in mice. FTIR images were collect from histological sections, and six machine learning models were applied and assessed. Xtreme gradient boost and Linear Discriminant Analysis presented the best accuracies results, indicating to be potential models for breast cancer classification tasks.



Associating vascular imaging with hypoxia and cell survival in vivo for Biophotonics applications

M. Atif (King Saud University)

8:00 to 17:15  ·  Poster Session 2

As oncological treatments aim to move towards personalize medicine, increase tissue response monitoring has become the focus of research. In particular, spatially resolved in vivo information of hypoxia and its relationship to cell survival is required to maximize the patient's benefit. At the same time, several preclinical imaging approaches were developed in the past years, including Photoacoustic, Bioluminescence, shown to predict blood flow/volume. Here Photoacoustic Imaging is used to study tumor hypoxia imaging and cell survival for Photodynamic Therapy monitoring. Here, the Photoaoustic and Bioluminescence signal's temporal dynamic to detect vascular changes during and post-PDT are evaluated.



A Methodology for Performance Prediction of Uncompensated Submarine Optical Systems

José Hélio da Cruz Jr (CPqD); Tiago Sutili (CPqD); Júlia Aline Sousa Maciel (CPqD); Rafael C. Figueiredo (CPqD)

8:00 to 17:15  ·  Poster Session 2

We emphasize the growth of interest in teeth whitening agents that are leading to a paradigm shift through continuous monitoring of their optical properties. The characteristics of commercial agents were investigated by monitoring the light absorption and scattering on bovine enamel fragments. The optical properties were provided by an integrating sphere. An increase of optical scattering in enamel after bleaching was observed in all analyzed samples. The use of calcium in the whitening gel did not reduce the scattering (p<0.05), calculated by fitting the spectra by the scattering equation model.



The LoRa-Modulation Technique Applied to Outdoor Visible Light Communication Links

Rafael Gadens (UTFPR); Alexandre Pohl (UTFPR); Paulo de Tarso Neves Jr. (UTFPR)

8:00 to 17:15  ·  Poster Session 2

In this work we employ the LoRa-based modulation technique to simulate a VLC outdoor link under different atmospheric conditions. Results show that distances longer than 15 meters can be reached under a moderate fog condition, making it possible to cover the required range within a local area network, where internet access points are attached to street poles.



RoF/FSO System Based on a Monolithically Integrated Multi-wavelength Transmitter

Matheus Sêda (INATEL); Eduardo Sala (INATEL); Nicola Andriolli (National Research Council of Italy); Danilo Spadoti (UNIFEI); Juliano Oliveira (Idea Electronic Systems); Giampiero Contestabile (Scuola Superiore Sant'Anna); Arismar Cerqueira Jr. (INATEL)

8:00 to 17:15  ·  Poster Session 2

We propose and report the implementation of a hybrid radio-over-fiber (RoF)/ free-space optics (FSO) system employing a monolithically integrated multi-wavelength transmitter. In such system, a 20-MHz bandwidth M-QAM signal is transmitted over 12.5-km optical fiber fronthaul, followed by a 1.5-m FSO access. The overall system performance is estimated by means of root mean square error vector magnitude (EVMRMS), as a function of optical power and modulation indexes. Experimental results indicate a 180 Mbit/s throughput, accomplishing the 3GPP requirements with plenty of margins, demonstrating the hybrid system applicability for fifth and sixth generation of mobile networks (5G and 6G).



Peaceful Coexistence Between 5G NR an LTE-A Over a RoF-Based Fronthaul

Celso Henrique (INATEL); Eduardo Sala (INATEL); Luiz Augusto Melo Pereira (INATEL); Arismar Cerqueira S. Jr. (INATEL)

8:00 to 17:15  ·  Poster Session 2

This work presents the implementation and peaceful coexistence analysis between a 5G New Radio (5G NR) and Long Term Evolution-Advanced (LTE-A) signals over radio over fiber (RoF) based 25-km fronthaul, operating in the non-standalone (NSA) mode. Three signals are investigated, namely: 10-MHz bandwidth Filtered Orthogonal Frequency Division Multiplexing (F-OFDM) at 778 MHz; five 20-MHz LTE-A subbands at 2.24 GHz; 100-MHz bandwidth 5G NR signal at 2.35 GHz. The system performance is estimated measuring the root mean square error vector magnitude (EVMRMS), as a function of the optical power and the 5G NR and LTE-A frequency offset, achieving 1.4 Gbps throughput.

Poster Session 2 Q&A

17:15 to 18:20 / Auditorium

All presenters of Monday's posters must participate in this Q&A session

Sebastião Pratavieira (USP)

17:15 to 18:15 / Auditorium




The Brazilian Photonics Society has begun its activities on May 24th, 2017 with the main objective to work for increasing the importance and awareness of optics and photonics in Brazil and South America.

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