Jozef Chovan

ORCID: 0000-0003-3445-7538
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Photonic and Optical Devices
  • Semiconductor Lasers and Optical Devices
  • Optical Network Technologies
  • Advanced Photonic Communication Systems
  • Advanced Fiber Optic Sensors
  • graph theory and CDMA systems
  • Advanced Fiber Laser Technologies
  • Coding theory and cryptography
  • Semiconductor Quantum Structures and Devices
  • Photonic Crystals and Applications
  • Photonic Crystal and Fiber Optics
  • Optical Coatings and Gratings
  • Plasmonic and Surface Plasmon Research
  • Gold and Silver Nanoparticles Synthesis and Applications
  • GaN-based semiconductor devices and materials
  • Advanced Semiconductor Detectors and Materials
  • Underwater Acoustics Research
  • Glass properties and applications
  • Nanowire Synthesis and Applications
  • Advancements in Semiconductor Devices and Circuit Design
  • Flow Measurement and Analysis
  • Advanced Optical Sensing Technologies
  • Advanced Optical Network Technologies
  • Analytical Chemistry and Sensors
  • Quantum and electron transport phenomena

Slovak Centre of Scientific and Technical Information
2023-2024

International Laser Center
2011-2022

Vorarlberg University of Applied Sciences
2019-2020

Slovak University of Technology in Bratislava
2002-2020

Sylex (Slovakia)
2020

General Electric (United States)
1970-1976

Photonic Integrated Circuits allow to meet the increasing demand of communication systems for internet which is growing at about 40% per year.This growth driven mainly by video traffic in network.This now further accelerated mobile access, with clients shipping on all smart phones and tablets, enabling be consumed more conveniently via network connections anywhere anytime.This paper reviews several material platform photonic integrated circuits compares their performance.This also describes...

10.13164/re.2018.0357 article EN cc-by Radioengineering 2018-06-14

In this paper we report on the experimental test set-up for temperature characterization of optical multiplexers/demultiplexers in C - telecommunication band . Particularly change transmission parameters like polarization dependent loss and insertion are investigated. The measurements were performed range under ambient air-conditions equal to installation passive elements external outdoor non–climatic environment.

10.15598/aeee.v9i3.512 article EN cc-by Advances in Electrical and Electronic Engineering 2011-10-13

We present the design, simulation, evaluation, and technological verification of various low-index optical demultiplexers based on arrayed waveguide gratings (AWGs). When designing such demultiplexers, a set input geometrical parameters must be first calculated. They are essential to create AWG layout that will then simulated using commercial photonics tools. However, these tools do not support or only partially fundamental calculation. Therefore, new stand-alone tool called AWG-Parameters...

10.1117/1.oe.53.7.071803 article EN Optical Engineering 2014-01-21

In this paper, a 256-channel, 10-GHz arrayed waveguide gratings demultiplexer for ultra-dense wavelength division multiplexing was designed using an in-house developed tool called AWG-Parameters. The AWG central of 1550 nm and the structure simulated in PHASAR from Optiwave. Two different designs were influence design parameters on performance studied.

10.1109/icton59386.2023.10207508 article EN 2023-07-02

We present the design, simulation and evaluation of low-index 8-channel, 100 GHz optical demultiplexer based on arrayed waveguide gratings (AWG). The AWG structure was designed using AWG-Parameters tool layout created simulated three commercial photonic tools: Optiwave, Apollo Photonics R-Soft. design also technologically verified. output simulated/measured transmission characteristics were evaluated by AWG-Analyzer tool. parameters, calculated from characteristics, show very similar results...

10.1109/asdam.2012.6418537 article EN 2012-11-01

In this paper we present the position method to correct channel spacing between transmitted channels of an AWG. The developed was applied 20-ch 200 GHz AWG and achieved results confirm very good correlation required (200 GHz) spacings calculated from simulated transmission characteristics.

10.1109/asdam.2014.6998685 article EN 2014-10-01

Photonics is one of the most important technologies 21st century. It fundament today's optical communications, all-optical signal processing, biomedical diagnostics, sensing, display systems and energy efficient smart lighting. Photonic sensors as a basic part many photonic are under huge development. represented by really multidisciplinary research. Small, smart, sensitive, selective, fast, robust, inexpensive remotely controllable ultimate goal. The potential to achieve these capabilities...

10.1109/radioelek.2014.6828404 article EN 2014-04-01

We present the design and simulation of low loss 1 × 64 Y-branch optical splitter having symmetric splitting ratio small footprint. This was reached by optimizing used waveguide structure that eliminates presence first mode, causing asymmetric split power over all output waveguides. way we were able to reduce length nearly one third its original designed value.

10.1109/asdam.2014.6998686 article EN 2014-10-01

Material properties are described by some physical parameters such as temperature or pressure. Optical of materials very important for applications where is light electromagnetic wave dominant. Behavior the in interaction with depends on refractive indices. These indices same various sizes materials, but nanoscale dimensions, they depend phenomena. Herein, we present study silver (Ag) nanoparticle (NP) monolayer film and its dielectric properties. The aim to explain phenomenon why it...

10.1117/12.2033646 article EN Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE 2013-10-11

New approach for reducing of the dimensions Y-branch optical power splitter by using a two-dimensional photonic crystal (PhC) is reported in this paper. Two-dimensional with band gap was designed and simulated plane wave expansion algorithm (PWE). This 1.31 μm wavelength range it based on AlxGax-1As/GaAs material platform. Optical RSoft's Photonic Component Design Suite 3D simulations were performed beam propagation method (BPM). The PhC implementation suitable pattern to leads spread signal...

10.1117/12.2007288 article EN Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE 2012-12-18

SiON is a suitable material for the implementation of photonic integrated circuits with middle refractive index contrast visible and near infrared region. The paper presents design, fabrication characterization SiON/SiO2/Si structures passive optical waveguides realization designed 0.13. This allows strip SiOx/SiON/SiO2/Si waveguide band losses bellow 0.01dB/cm at 150um radius. SiOx layers were fabricated by plasma-enhanced chemical vapor deposition techniques. technological parameters tuned...

10.1117/12.2295305 article EN 2017-12-01

We present the modification of a decoder for 2D wavelength/time (W/T) optical code division multiple access (O-CDMA) system by hard-limiters. The performance improvement using proposed is shown numerical simulation bit error probability as function active user number and weight codeword different topologies. influence non-ideal properties hard-limiters used on in studied. evaluation shows that dependence versus has local minimum, which allows an optimum to be chosen achieving minimum W/T...

10.1109/icton.2004.1360280 article EN 2005-01-20

We present the design and simulation of 1×8 Y-branch optical splitter based on silicon nitride waveguide platform. The simulations were performed for operating wavelength λ = 850nm applying RSoft photonics tool. designed was optimized according to properties length, simulated results show strong improvement performance parameters.

10.1109/asdam.2018.8544615 article EN 2018-10-01

This paper presents design, simulation and optimization of 1×8 Y-branch power splitters based on Si/SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /SiN/SiO xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> material platform. For the designs, two different waveguide structures were used, i.e. ridge rib waveguides. The designed for 850 nm spectral optical window simulations performed applying FEM BPM methods in RSoft photonic tool....

10.1109/icton.2019.8840394 article EN 2019-07-01

We have investigated the deposition and etching process of silicon oxynitride (SiON) films for optical waveguides on wafer. SiON were deposited using plasma-enhanced chemical vapor (PECVD) system. Thickness, uniformity refractive index was measured by micro-spot spectroscopic reflectometry confirmed ellipsometry. Aluminum (Al) mask fabricated purpose lift-off process. etched in low pressure inductively coupled plasma - reactive ion (ICP-RIE) chamber CF <sub...

10.1109/radioelektronika49387.2020.9092431 article EN 2020-04-01

We report design and investigation of PECVD SiO2:N/SiO2 slab waveguide grating with a width modulation for sensing application at 1550 nm spectral range. The fundamental parameters reflected spectrum by is simulated investigated as function temperature, cover refractive index strain. apodization designed possible to be realized in one technological step.

10.1109/radioelek.2014.6828488 article EN 2014-04-01

Polymeric slot waveguide for photonics sensing was designed, simulated and studied in this work. The polymeric designed on commercial Ormocer polymer platform operates at visible 632.8 nm wavelength. Designed detects the refractive index change of ambient material by evanescent field label-free techniques. motivation reported work to design a low-cost arms integrated Mach-Zehnder interferometer optical sensor with reduced temperature dependency. minimal dimensions advanced structure were...

10.1117/12.2263094 article EN Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE 2016-12-24
Coming Soon ...