Technical Program

PL-G-MON

Plenary 1

9:00 to 12:40 / Room 1 (Live)

Daniel Pataca, Vanderlei Bagnato, Mônica Rocha

1

PL-G-MON-01

Opening Cerimony

Alexandre Pohl

9:00 to 9:05  ·  Room 1 (Live)

2

PL-G-MON-02

Opening Cerimony

Vanderlei Salvador Bagnato

9:05 to 9:10  ·  Room 1 (Live)

3

PL-G-MON-03

Initiatives of Ministry of Science, Technology and Innovation (MCTI) in Photonics

Paulo Cesar Rezende de Carvalho Alvim

9:10 to 9:30  ·  Room 1 (Live)

This presentation aims to present the Photonics initiatives carried out within the scope of the Ministry of Science, Technology and Innovation – MCTI. Inside the Ministry, the Secretariat of Entrepreneurship and Innovation (SEMPI-MCTI) has been responsible for Public Policies in Photonics since 2017. The General Coordination of Enabling Technologies (CGTH-DETAP-SEMPI-MCTI) is the technical area responsible for carrying out Programs in the fields of Photonics. In order to assist the MCTI in technical discussions, the MCTI implemented, through the Presidential Ordinance no. 10,137/2019, an Advisory Committee of Photonics (CCFOTO), designed to formulate, and evaluate proposals related to photonics. In addition, MCTI has been working with structuring Public...

4

PL-G-MON-04

Intraoperative 5‑ALA photodynamic therapy for newly diagnosed glioblastoma patients: a preliminary analysis of the INDYGO clinical trial (NCT03048240)

Serge Mordon

9:30 to 10:15  ·  Room 1 (Live)

Glioblastoma (GBM) is the most aggressive malignant primary brain tumor. The unfavorable prognosis despite maximal therapy relates to high propensity for recurrence. Thus, overall survival (OS) is quite limited and local failure remains the fundamental problem. <br><br> A safety and feasibility trial after treating GBM intraoperatively by photodynamic therapy (PDT) after 5-aminolevulinic acid (5-ALA) administration and maximal resection was performed at The Lille University Hospital, France. <br><br> Ten patients with newly diagnosed GBM were enrolled and treated between May 2017 and June 2018. The standardized therapeutic approach included maximal resection (near total or gross total tumor resection (GTR)) guided by 5-ALA...

5

PL-G-MON-05

Advancing photonic systems through machine learning

Francesco Da Ros

10:15 to 11:00  ·  Room 1 (Live)

As our current society is highly dependent on our ability to share information, optical communication systems, i.e. the backbone of our communication infrastructure need to continuously evolve. The machine learning (ML) toolbox provides an effective and necessary set of tools to enable such technological advancements, as ML excels at: 1) learning complex input-output mappings allowing for simple system optimization, 2) extracting optimal decision rules for highly nonlinear classification problems 3) performing ultra-sensitive signal detection, 4) solving inverse system design problems. These strengths of ML make it applicable from the characterization of photonic devices to the optical subsystem design and full end-to-end system optimization....

BREAK

11:00 to 11:10

Break

6

PL-G-MON-06

Brian Wilson

11:10 to 11:55  ·  Room 1 (Live)

7

PL-G-MON-07

‪Nicolas Fontaine

11:55 to 12:40  ·  Room 1 (Live)

Lunch Break

Technical Session 1

14:30 to 17:40 / Room 1 (Live)

Biophotonics 1

Luciano

14:30 to 15:40 / Room 1 (Live)

8

OS-B-MON-01-01

Fourier-Transform Infrared spectroscopy versus antibodies chemiluminescent immunoassay for COVID-19 diagnosis

Invited Paper

Herculano da Silva Martinho (UFABC); José Angelo Lauletta Lindoso (USP); Paulo Henrique Braz da Silva (USP); Carla Carolina Bandeira (UFABC)

14:30 to 15:00  ·  Room 1 (Live)

COVID-19 is a World sanitary emergency. The tragedy related to this epidemic disease evolves actually more than 100 million confirmed cases and at least 2 million deaths. In this work we investigate whether FTIR operating under blood serum samples is viable option for COVID-19 diagnosis and fatality prediction. The performance of FTIR was compared to chemiluminescence immunoassay for anti-SARS-CoV-2 IgM and IgG antibodies in order to discuss vantages and advantages and viability for point-of-care applications

9

OS-B-MON-01-02

Spectral optimization for RGB skin oxygenation measurements

Antonio de Sousa Dias (USP); Murilo S. Sampaio (USP); Raquel Pantojo de Souza (USP); George C. Cardoso (USP)

15:00 to 15:20  ·  Room 1 (Live)

In this article we investigate the spectral properties of light and RGB systems that optimize precision for spectral quantification of chromophores melanin, oxyhemoglobin, and deoxyhemoglobin in skin images. The methodology uses the Beer-Lambert law, and the stability of the resultant system of equations is studied regarding spectral properties of the RGB channels plus illuminant. We found that a well-posed problem depends on the choice of the spectral properties of the illuminant and the RGB. Poor spectral choices lead to losses of up to three significant digits beyond in system noise. We also show the desirable spectral ranges.

10

OS-B-MON-01-03

Evaluation of curcumin incubation time in Staphylococcus aureus and Pseudomonas aeruginosa Photodynamic Inactivation

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

15:20 to 15:40  ·  Room 1 (Live)

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.

15:40 to 16:00

Break

Biophotonics 2

Cristina

16:00 to 17:40 / Room 1 (Live)

11

OS-B-MON-02-01

Invited Paper

Vladislav V. Yakovlev (Texas AM&U)

16:00 to 16:30  ·  Room 1 (Live)

12

OS-B-MON-02-02

Invited Paper

Robinson Sabino da Silva (UFU)

16:30 to 17:00  ·  Room 1 (Live)

13

OS-B-MON-02-03

Hyperspectral Imaging System for Tissue Classification in H&E-Stained Histological Slides

Mateus Souza (USP); Felipe Carvalho (USP); Enzo Sverzut (USP); Michelle Barreto Raquena (USP); Marlon Rodrigues Garcia (USP); Sebastião Pratavieira (USP)

17:00 to 17:20  ·  Room 1 (Live)

This paper presents the development of a hyperspectral imaging system for the classification of H&E-stained histological slides. The system was developed to be coupled to a conventional microscope, with software dedicated to control the instrumentation, to show a colorful life image from an RGB camera, and to acquire the hyperspectral imaging using a liquid crystal tunable filter (LCTF). Hyperspectral images of rats undergoing photodynamic therapy were classified with four different machine learning algorithms to find damaged tissues (crust). The classification results were presented, and show that this technique is promising to classify rats tissue regions.

14

OS-B-MON-02-04

Healing status of burn wound healing: ATR-FTIR study

Pedro Castro (IPEN); Telma Zorn (USP); Denise M. Zezell (IPEN)

17:20 to 17:40  ·  Room 1 (Live)

The purpose of this study is to use infrared spectroscopy (FTIR) for monitoring biological changes in burned skin. Wistar rats dorsum samples were compared to healthy group samples at 7, 14, 21 days after burn. Proteins changes of burn wounds were monitored by area under the curve (AUC) of bands at 1630cm-1, 1543cm-1 and 1743cm-1. Kruskal-Wallis normality tests, unpaired t test with Welch's correction were used to evaluate the differences between AUC. These bands suggest association between collagen activity during wound healing stages. Our result indicates progressive recovery of 7,14 and 21 days tissues when compared with the healthy group.

Technical Session 2

14:30 to 17:10 / Room 2 (Live)

Optical Communication 1

Rafael

14:30 to 15:40 / Room 2 (Live)

15

OS-C-MON-01-01

Recent advances in machine learning-enabled inverse system design

Invited Paper

Uiara Celine de Moura (DTU Fotonik)

14:30 to 15:00  ·  Room 2 (Live)

The traditional procedure to design optical devices consists of starting with an initial set of parameters (normally based on the designer's previous knowledge) and performing some parameter sweep around the initial condition to improve the device performance. This human-controlled design approach has two key drawbacks: it is time-consuming/work-intensive and tends to ignore solutions that could have better performance but are far from the initial guess. Based on the idea that the underlying features in a given data set can be automatically learned through specific algorithms, machine learning techniques have been successfully applied in optical communication systems and integrated photonics. They are employed to learn complex functions and perform the...

16

OS-C-MON-01-02

Front-End Specifications Impact on Kramers-Kronig Self-Coherent Systems

André Souza (Infinera); José Hélio da Cruz Jr (CPqD); Tiago Sutili (CPqD); Rafael C. Figueiredo (CPqD)

15:00 to 15:20  ·  Room 2 (Live)

This work evaluates the requirements in terms of resolution and bandwidth of digital-to-analog and analog-to-digital converters and linewidth of lasers in a system with Kramers-Kronig receiver with receive-side laser and polarization multiplexing. The results indicate that spectral efficiency and lasers' linewidth requirements are close to those of coherent systems, but demanding twice the bandwidth of the analog-to-digital converter. Therefore, employing KK to replace coherent reception will require a careful analysis of energy consumption, performance and complexity trade-off, taking into account that KK demands a front-end with more complex specifications to achieve the desired performance.

17

OS-C-MON-01-03

Intensity Modulated Optical Systems for Next Generation of Data Center Interconnects

Tiago Sutili (CPqD); Sandro Marcelo Rossi (CPqD); Andre Souza (Infinera); José Hélio da Cruz Jr (CPqD); Rafael C. Figueiredo (CPqD)

15:20 to 15:40  ·  Room 2 (Live)

This work investigates the performance of intensity modulated point-to-point optical links considering limitations from the electro-optical modulator bandwidth. All simulated scenarios considered a net transmission rate of 1 Tb/s, aiming to evaluate the feasibility of intensity modulated solutions for the next generation of short range optical links. Results indicate that, even considering a state-of-the-art electro-optical modulator, a 1-Tb/s transmission is viable only by using several wavelength-multiplexed optical subcarriers. The increase in the cost of this approach, when compared to coherent or self-coherent solutions, indicates the tendency to employ more spectrally efficient solutions on next-generation Data Center interconnects.

15:40 to 16:00

Break

Optical Communication 2

Mônica

16:00 to 17:10 / Room 2 (Live)

18

OS-C-MON-02-01

FEC-assisted Nonlinearity Compensation for Coherent Optical Receivers

Invited Paper

Edson Porto da Silva (UFCG)

16:00 to 16:30  ·  Room 2 (Live)

An overview of the FEC-assisted digital signal processing (DSP) techniques for fiber nonlinearity compensation (NLC) in coherent optical receivers is presented, with focus on DSP schemes that are able to improve the performance of NLC by using hard or soft information feedback from FEC-decoders. Challenges and new research directions are discussed.

19

OS-C-MON-02-02

32-GBd 16QAM Optical Signals Wavelength Conversion based on Four-Wave Mixing Phenomena in Semiconductor Optical Amplifiers

Peterson Rocha (Unicamp); Tiago Sutili (CPqD) (CPqD); Sandro Marcelo Rossi (CPqD); Cristiano M. Gallep (Unicamp); Rafael C. Figueiredo (CPqD); Evandro Conforti (Unicamp)

16:30 to 16:50  ·  Room 2 (Live)

A scheme based on the four-wave mixing (FWM) phenomena in semiconductor optical amplifiers (SOA) is optimized and characterized for low-penalty wavelength conversion of 16-ary quadrature amplitude modulated (16QAM) signals with symbol rates equal to 20 GBd, 28 GBd, and 32 GBd. Through an experimental optimization process, the SOA operational conditions were adjusted to avoid severe degradation of the converted signal due to nonlinear phenomena and noise insertion, while maximizing the conversion efficiency avoiding spurious FWM products. The obtained results indicate the feasibility of employing ultra-nonlinear SOAs to perform low-penalty wavelength conversion in coherent optical systems.

20

OS-C-MON-02-03

Nonlinear phase noise compensation in single-span digital coherent optical systems employing artificial neural networks

Lucas Marim (UNESP); Rômulo de Paula (UNESP); José de Oliveira (UNESP); Miriam Santos (UNESP); Rafael Abrantes Penchel (UNESP); Gretell Perez (UNESP); Marcelo Abbade (UNESP); Ivan A , Aldaya (UNESP)

16:50 to 17:10  ·  Room 2 (Live)

As digital coherent technology gets mature and its cost reduces, it is becoming a competitive solution for future implementations of high-capacity long-reach passive optical networks (LR-PON). In the case of single-channel LR-PONs, the system performance is ultimately limited by the combined effect of the receiver additive noise and the nonlinear phase noise, which in turn is a consequence of the interplay between dispersion and Kerr-induced self-phase modulation. In this paper, we show that by employing a three-layer artificial neural network (ANN) to mitigate the effect of nonlinear phase noise, the bit error rate is reduced from 7·10-4 to 5·10-4.

Tutorial Session 1

14:30 to 16:55 / Room 3 (Live)

Lasers

Daniel

14:30 to 16:55 / Room 3 (Live)

21

TS-L-MON-01-01

High Intensity ultrashort laser pulses and their development at IPEN

Ricardo Samad (IPEN); Nilson Vieira (USP)

14:30 to 15:15  ·  Room 3 (Live)

In this work recent developments on high-intensity ultrashort laser pulses will be presented.

BREAK

15:15 to 15:20

Break

22

TS-L-MON-01-02

An Overview on Laser Shock Peening Process: From Science to Industrial Applications

Alexandre Cunha (SENAI)

15:20 to 16:05  ·  Room 3 (Live)

The surface of a material plays an important role in the behavior of engineered components. Surfaces are subjected to treatments in order to enhance the material performance by modifying and controlling its physical properties. In particular, modification of mechanical properties affects the wear and corrosion resistances, fatigue strength and, therefore, the component’s service lifetime. In this scenario, peening processes are employed on different industrial sectors. The term “peening” originates from the act of hitting a metallic surface with the ball-peen end of a hammer. In history, blacksmiths have used this procedure to forge weapons and tools. In the modern industry, the technique has evolved to shoot metal or ceramic particles on the metal surface....

BREAK

16:05 to 16:10

Break

23

TS-L-MON-01-03

Electron beam properties in self-modulated laser wakefield acceleration using TW and sub-TW pulses

Edison Puig Maldonado (ITA); Ricardo Samad (IPEN); Alexandre Bonatto (UFCSPA); Roger Pizzato Nunes (UFRGS); Sudeep Banerjee (Arizona State University); Nilson Vieira (IPEN)

16:10 to 16:55  ·  Room 3 (Live)

We review the fundamentals of electron beam generation in the self-modulated laser wakefield acceleration for the case of laser pulses with peak powers on the TW and sub-TW scale. The results of particle-in-cell simulations for λ = 0.8 μm and a thin H2 gas target are shown. By scanning the peak gas density values and the peak power of the incident laser, we discuss the resulting acceleration processes, as well as the characteristics of the electron beams generated for different conditions. Our approach provides a method to optimize these beams with lasers that operate at kHz repetition rates.

Tutorial Session 2

14:30 to 16:55 / Room 4 (Live)

Optics and Instrumentation

Cleber

14:30 to 16:55 / Room 4 (Live)

24

TS-O-MON-01-01

Femtosecond pulses for nonlinear optics: Temporal, spectral and polarization dependence studies

Lino Misoguti (USP)

14:30 to 15:15  ·  Room 4 (Live)

Due to their unique properties, femtosecond laser pulses have many applications in several areas of applied optics. In nonlinear optics, for instance, the broad bandwidth, high intensity and short pulse duration are explored by several experimental techniques to improve the understanding of nonlinear optical effects. Nowadays, thanks to the tunable laser pulses, it is possible to determine the spectral response of several materials’ nonlinear effects. Moreover, among the study of response time of ultrafast phenomena, we can use these pulses with appropriate experimental method and laser polarization state to discriminate the origin of nonlinear effects. As it is known, an effective nonlinear optical signal can arise from different origins such as nearly...

BREAK

15:15 to 15:20

Break

25

TS-O-MON-01-02

Rodrigo Vicentini (to be confirmed)

15:20 to 16:05  ·  Room 4 (Live)

BREAK

16:05 to 16:10

Break

26

TS-O-MON-01-03

Hand-held photoacoustic imaging systems for biomedical applications

Theo Zeferino Pavan (USP)

16:10 to 16:55  ·  Room 4 (Live)

Photoacoustic imaging (PAI) can provide physiological and anatomical information by combining optical absorption contrast with ultrasound spatial resolution and can be obtained up to a depth of a few centimeters. In PAI, short pulses of light are absorbed by the tissue, causing a local thermal expansion and subsequent acoustic wave emission. Hand-held PAI systems usually operate in reflection mode, where optical illumination and acoustic detection are arranged on the same side. In this talk, I will give an overview of different strategies for both optical illumination and acoustic detection reported for hand-held devices. A more detailed description will be provided for strategies involving linear-array transducers, which are commonly used in clinical...

Poster Session 1

8:00 to 17:15 / Conference Website (On Demand)

27

PS-MON-01-01

Analytical Formulation of an Yb-doped Tandem-Pumping Fiber Amplifier

Pedro Bernardo Melo (USP); Ricardo E. Damad (IPEN); Claudio Motta (USP)

8:00 to 17:15  ·  Conference Website (On Demand)

An analytical formulation of a multi-kilowatt ytterbium-doped double-cladding tandem-pumped fiber amplifier was developed and is reported in this paper. The model consists of a system including the laser rate, pumping and seed power equations. The model was validated by describing a fiber amplifier behavior with a 5.986kW, 1018nm pumping and a signal seed of 75W, 1080nm, yielding a maximum power output of 5.448kW, with an efficiency of 91.1%. The thermal equations are solved for the temperature distribution along the fiber with a maximum temperature of 43.24°C, when the convective coefficient of 4000W . m -2 . K -1 is used.

28

PS-MON-01-02

New double line architecture produced by fs laser irradiation in Nd3+ doped TeO2-ZnO glass for photonic applications

Evellyn Magalhães (USP); Niklays Wetter (IPEN); Luciana Kassab (FATEC-SP); Wagner de Rossi (IPEN)

8:00 to 17:15  ·  Conference Website (On Demand)

We report fabrication and passive characterization of Nd3+ doped TeO2-ZnO glass with a new configuration of double waveguides, written with fs laser. The two written lines that form the double waveguide are formed by several overlapping lines. Results of output mode profile, beam quality factor M2 (My of 24 and Mx of 14 at 632nm) and refractive index change are presented and laser writing parameters. Writing speed of 0.5mm/s and pulse energy of 15µJ demonstrated to be adequate parameters. Refractive index changes of 1x10-5 and 1x10-4 at 632nm for double waveguides written with 4/8 overlapping lines, respectively are shown.

29

PS-MON-01-03

Numerical Simulations of Gain and Power of a Multi-Quantum Well Laser

Wender Gonçalves Daniel (Idea! Electronic Systems)

8:00 to 17:15  ·  Conference Website (On Demand)

This paper presents the results and procedures of simulations of our Multi-Quantum Well (MQW) laser in a model constructed in the commercial solvers of the Ansys/Lumerical® software. Usually, the design and fabrication of lasers MQW are challenging and expensive, thus simulations can hasten the development and give insights about design parameters. In this work, simulated power curves are compared to the measured curves, and a good agreement is obtained when the parameters are adjusted. Nonradiative recombinations and self-heating are the main effects that influence the performance of the simulated laser.

30

PS-MON-01-04

Refractive Index Change Analysis in a High-Power Yb-doped Double-Clad Fiber Laser

Elbis Cardoso (USP); Ricardo E. Samad (IPEN); Claudio Motta (USP)

8:00 to 17:15  ·  Conference Website (On Demand)

An analytical investigation of the refractive index behavior of an ytterbium-doped optical fiber silica glass as a function of the core-clad temperature, upper-level population laser density and pumping signal intensity is presented in this paper. For the substantiation of the investigation, three fundamental expressions were used, which describe the changes in the refractive index due to these physical phenomena in the laser medium. The model was evaluated considering a 500 W steady state fiber laser, operating in a two-end pumped configuration.

31

PS-MON-01-05

Record Optical Efficiency for a Diode-Side-Pumped Nd: YFL4 Laser Operating at 1053 nm

Felipe M. Prado (USP); Niklaus Wetter (IPEN)

8:00 to 17:15  ·  Conference Website (On Demand)

Here we compare the efficiency and beam parameters of different single-bounce Nd: YLF4 resonators. A total of five cavities were made by changing both, the folding mirror and the output coupler of the resonator. The best configuration resulted in a cavity that generated a record slope efficiency of 67% and 63% of optical-to-optical efficiency with a peak output power of 64.5 W for a pumping power of 101.8 W at 797 nm.

32

PS-MON-01-06

Theoretical and experimental study of supersonic gas jet targets for laser wakefield acceleration

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

8:00 to 17:15  ·  Conference Website (On Demand)

This work reports a theoretical and experimental study of supersonic gas jet flows that work as a renewable target laser wakefield particle acceleration. A comparison between theoretical and experimental results is made in order to estimate previously the results of a real De Laval nozzle manufactured in our laboratory. The comparison between the results shows that the CFD simulations describes the phenomena of the supersonic gas jet flow for N2.

33

PS-MON-01-07

Diamond-based optical vector magnetometer to study current densities in 2D materials

Charlie O. Oncebay Segura (Universidad Nacional De Ingeniería, Peru); Sergio R. Muniz (USP)

8:00 to 17:15  ·  Conference Website (On Demand)

We describe the construction and characterization of a high-resolution optical magnetometer to measure the full vector magnetic field on a plane just a few nanometers thick, near the surface of the device. It is a solid-state device based on atom-like quantum sensors created by an engineered layer of NV centers located less than 20 nm from the surface of an ultrapure diamond. The ensemble of quantum nanosensors provides a vector magnetometer capable of mapping magnetic fields and current densities with a submicrometer resolution, suitable to study 2D materials. Here, we show a custom-built prototype to demonstrate the principle.

34

PS-MON-01-08

Dynamically controlled double-well optical potential for colloidal particles

Thalyta T. Martins (USP); Sergio R. Muniz (USP)

8:00 to 17:15  ·  Conference Website (On Demand)

Here, we present a simple modulation scheme to create and dynamically control a double-well optical trap, using digital square waveforms. This simple, but effective, scheme allows to study the behavior of colloidal particles under dynamical controlled conditions.

35

PS-MON-01-09

Surface Oxidation of AISI 304 stainless steel using a 445 nm diode laser

Rudimar Riva (UNIFESP); Nathalia Jesus (UNIFESP); Millena Contente (UNIFESP); Romario Pinheiro (INPE); Evaldo Corat (INPE); Aline Capella (UNIFESP); Walter Miyakawa (IEAv)

8:00 to 17:15  ·  Conference Website (On Demand)

In this work, we investigate surface oxidation on AISI 304 stainless steel using a low-cost engraving system based on a low power 445 nm diode laser. The treated samples were analyzed by optical microscopy as well as by Raman spectroscopy. The oxides formed on the steel surface were identified, and the results show the influence of the operating parameters on the oxidation formation process.

36

PS-MON-01-10

Highly Efficient Fermi Level Tunning in EO Waveguide Based on Double Layer Graphene Capacitor

Hilton H. Shimabuko (Mackenzie); Ary V. R. Portes (UFMG); Lúcia Akemi Miyazato Saito (Mackenzie); Jhonattan Cordoba Ramirez (UFMG)

8:00 to 17:15  ·  Conference Website (On Demand)

The implementation of low-loss electrooptical devices in multiple areas of knowledge has been a recurring need in the scientific community since most conductive materials have high optical absorption. The graphene has been presented as a possible solution, due to its extraordinary electrical and mechanical properties and bands distribution without a bandgap, which provides the optimal conditions to tune the optical absorption of the material, varying its Fermi energy. In this work, the design of strongly confined optical mode embedded double-layer graphene capacitor, based on Fermi level control is presented.

37

PS-MON-01-11

Modeling of Fiber Bragg Gratings with Different Lengths for the Reflectivity Control for Fiber Lasers

Davu Bacarattu (USP); Ricardo E. Samad (IPEN); Claudio Motta (USP)

8:00 to 17:15  ·  Conference Website (On Demand)

An analytical formulation and modeling of an optical fiber Bragg grating has been developed and is reported in this paper. Supported by the coupled-mode theory and considering that the mode fields of the unperturbed waveguide remain unchanged in the presence of weak perturbations, it is possible to obtain first-order differential equations which have solutions for some types of periodic perturbations. Finally, the model is applied to analyze the influence of structural parameters of fiber gratings, such as length, period and refractive index modulation on its reflectivity and bandwidth.

38

PS-MON-01-12

Photonic Chip Characterization System With Layout Navigation

Claudecir Ricardo Biazoli (CTI); Roberto R. Panepucci (CTI)

8:00 to 17:15  ·  Conference Website (On Demand)

We developed an automated system for navigating photonic chips through layout for automatic testing as well as assisted troubleshooting. The system was built to allow, in addition to standard grating-coupling measurements, top-scattering measurement along the waveguide structures for characterization of the devices/materials for each platform layout and estimate the optical loss per unit of length, making it possible to improve the next generation of devices. Micrometer resolution mapping along the digitized path of the waveguide was achieved, enabling video monitoring of scattering events and changes in the intensity map.

Poster Session 1 Q&A

17:15 to 18:15 / Room 1 (Live)

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

Lino

17:15 to 18:15 / Room 1 (Live)

Organizer

Sponsors

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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.

To contact SBFoton and take active part in this movement, send an email to conference@sbfoton.org.br.

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