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    Wyświetlanie 1-14 z 14
    Tytuł:
    Relay-assisted WDM-FSO System: A Better Solution for Communication under Rain and Haze Weather Conditions
    Autorzy:
    Dayal, N.
    Singh, P.
    Kaur, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/958123.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    Free Space Optics
    Wavelength Division Multiplexing
    Opis:
    Among various conventional wireless communication systems, Free Space Optics (FSO) may be distinguished as well, which provides a good level security, high data rates, an enormous bandwidth and negligible susceptibility to electromagnetic interference. The main problem arises with unfavorable weather conditions, which affect the system’s parameters and require an aversion to other paths. The weather conditions discussed are rain and haze. Elimination of their adverse effects is essential for establishing a better communication system. The routing path is a major issue, as its decreased parameters lead to the diversion of the transmitted signal or to its total loss. In this article, increased system path length and proficiency levels are demonstrated by using relays, which are assisted by Wavelength Division Multiplexing (WDM).
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 4; 54-59
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Overview of Free Space Optics with Quantum Cascade Lasers
    Autorzy:
    Mikołajczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226628.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quantum cascade laser
    free space optics
    laser communications
    Opis:
    The article presents an overview of the work on quantum cascade lasers application in free space optical systems (Free Space Optics - FSO). There are discussed the main issues of the open-space laser communications and their practical construction. Comparative analyses of each FSO technology were performed. Brief description of quantum cascade (QC) lasers and some developments related to the use of these lasers in optical data link are also presented. In summary, the constructed models of FSO links with QC lasers are characterized.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 3; 259-264
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compact QCL driver for free-space transmitter
    Autorzy:
    Mikołajczyk, J.
    Garlińska, M.
    Wesołowski, M.
    Wojtas, J.
    Bielecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/201659.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    free space optics
    laser communication
    quantum cascade lasers
    laser driver
    Opis:
    The paper presents investigations of a free space optical transmitter operating with quantum cascade lasers. The main goal of the research was to determine influence of lasers driver parameters on an optical data link performance. Using some commercial driving devices, the laser pulse limitations of power, repetition rate and time duration have been observed. In the paper, the preliminary results of the designed laser driver are described. The driver was developed at the Institute of Optoelectronics, MUT in cooperation with scientists from the Faculty Electrical Engineering, WUT. It is characterized by high current efficiency, high pulse repetition rate, and compact construction. Additionally, the driver also includes a controller of Peltier modules
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 763-768
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Analysis of WDM-FSO Link under Turbulence Channel
    Autorzy:
    Mazin, Ali A. Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/1192036.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    free space optics
    BER
    Atmospheric Turbulence
    NRZ format
    RZ technique
    Opis:
    In this paper, the performance analysis of FSO communication link in various atmospheric turbulence has been analysis for different bit rate using NRZ and RZ technique. The effect of turbulence on the link performance has been investigated by varying bit rate, turbulence strength and modulation format. FSO performance carried out for BER, Q. factor, received power under maximum link. Simulation results show that RZ format is best for strong turbulence. Where NRZ technique is used for low and medium turbulence.
    Źródło:
    World Scientific News; 2016, 50; 160-173
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Wireless Communications Operated at Long-Wave Infrared Radiation
    Autorzy:
    Mikolajczyk, Janusz
    Szabra, Dariusz
    Prokopiuk, Artur
    Achtenberg, Krzysztof
    Wojtas, Jacek
    Bielecki, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/226104.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical wireless communication
    free space optics
    quantum cascade lasers
    optoelectronics
    telecommunications
    Opis:
    This paper presents some construction analysis and test results of a Free Space Optics system operating at the wavelength of 9.35 μm. In the system, a quantum cascade laser and a photoreceiver with mercury cadmium telluride photodetectors were used. The main parameters of these elements were discussed taking into account a data link operation. It also provides to determine a data range for various weather conditions related to scattering and scintillation. The results of numerical analyses defined the properties of currently available FSO technologies working in the near infrared or in the short infrared range of spectrum versus the performances of the developed system. The operation of this system was verified in three different test environments. The obtained results may also contain important issues related to the practical application of any FSO system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 2; 383-387
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza możliwości transmisji danych z wykorzystaniem laserów impulsowych
    Analysis of possibility of data transmission with use of pulsed lasers
    Autorzy:
    Drozd, T.
    Zygmunt, M.
    Knysak, P.
    Wojtanowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/210004.pdf
    Data publikacji:
    2011
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    transmisja danych
    lasery impulsowe
    łącze optoelektroniczne
    data transmission
    pulsed lasers
    free space optics
    Opis:
    W systemach transmisji danych wykorzystywane są lasery o pracy ciągłej. W artykule przedstawiono koncepcje transmisji danych z wykorzystaniem laserów impulsowych. Jest to szczególnie istotne dla urządzeń, w których laser impulsowy już jest wbudowany i realizuje inne funkcje (np. dalmierz). Przedstawione zostały zalety oraz ograniczenia takiego sposobu kodowania. Dokonana została analiza szybkości transmisji danych wraz z przedstawieniem wpływu poszczególnych elementów kanału transmisyjnego na wynikową szybkość transmisji danych.
    Pulsed lasers are used mainly in lidar systems, which generate laser pulses and detect and analyze reflected signals. In data transmission systems, continuous work lasers are used. It is also possible to use pulsed lasers in such systems. These features would be especially important for devices in which pulsed laser is already embedded and execute another function. This article shows data transmission system conception with the use of pulsed laser. Advantages and limits of this transmission method were described. Analysis of speed of data transmission was performed and influence of individual channel transmission elements on the data transmission speed was shown.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 2; 63-73
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Free-Space Optics Development
    Autorzy:
    Mikołajczyk, J.
    Bielecki, Z.
    Bugajski, M.
    Piotrowski, J.
    Wojtas, J.
    Gawron, W.
    Szabra, D.
    Prokopiuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/221245.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical communications
    open path laser communications
    line of sight communications
    free space optics
    Opis:
    The article presents state of work in technology of free-space optical communications (Free Space Optics - FSO). Both commercially available optical data links and their further development are described. The main elements and operation limiting factors of FSO systems have been identified. Additionally, analyses of FSO/RF hybrid systems application are included. The main aspects of LasBITer project related to such hybrid technology for security and defence applications are presented.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 4; 653-674
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative BER Analysis of Free Space Optical System Using Wavelength Diversity over Exponentiated Weibull Channel
    Autorzy:
    Shah, Dhaval
    Joshi, Hardik
    Kothari, Dilipkumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2055211.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bit error rate
    exponentiated weibull distribution
    free space optics
    FSO
    wavelingth diversity
    optimal combining
    Opis:
    Atmospheric turbulence is considered as major threat to Free Space Optical (FSO) communication as it causes irradiance and phase fluctuations of the transmitted signal which degrade the performance of FSO system. Wavelength diversity is one of the techniques to mitigate these effects. In this paper, the wavelength diversity technique is applied to FSO system to improve the performance under different turbulence conditions which are modeled using Exponentiated Weibull (EW) channel. In this technique, the data was communicated through 1.55 µm, 1.31 µm, and 0.85 µm carrier wavelengths. Optimal Combining (OC) scheme has been considered to receive the signals at receiver. Mathematical equation for average BER is derived for wavelength diversity based FSO system. Results are obtained for the different link length under different turbulence conditions. The obtained average BER results for different turbulence conditions characterized by EW channel is compared with the published result of average BER for different turbulence which is presented by classical channel model. A comparative BER analysis shows that maximum advantage of wavelength diversity technique is obtained when different turbulence conditions are modeled by EW channel.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 665--672
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FSO system performance analysis based on novel Gamma–Chi-square irradiance PDF model
    Autorzy:
    Todorović, Jelena
    Spalević, Petar
    Panić, Stefan
    Milosavljević, Bojana
    Gligorijević, Milan
    Powiązania:
    https://bibliotekanauki.pl/articles/2033970.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    free space optics
    FSO
    Gamma-Chi-square distribution
    atmospheric turbulence
    pointing error
    on-off keying
    OOK
    Opis:
    In order to provide a novel analytically traceable free space optics (FSO) channel model for describing turbulence based irradiance fluctuations, following basic scintillation theory principles, we have derived closed-form expression for probability density function (PDF) of a new statistical Gamma–Chi-square model. Further, capitalizing on provided model, error performances of FSO system over on-off keying (OOK) transmission scheme both in the presence of atmospheric turbulence and misalignment fading (pointing error) is investigated. For both cases, the average bit error rate (ABER) at the receiving side of the system is determined in an analytically closed form. The results are graphically presented in order to analyze the impact of different levels of turbulence, as well as other relevant parameters, on the quality of the received signal in the OOK modulated FSO system.
    Źródło:
    Optica Applicata; 2021, 51, 3; 335-348
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dwufalowe łącze optyczne
    Dual wavelength optical link
    Autorzy:
    Rajba, S.
    Lipiński-Kempys, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/155870.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    FSO (Free Space Optics)
    bezprzewodowe łącza w podczerwieni
    transmisja optyczna
    optolinia
    wireless infrared links
    optical transmission
    optolink
    Opis:
    Przedmiotem pracy jest analiza warunków pracy łączy optycznych w otwartej przestrzeni. Przedstawiono podstawowe uwarunkowania poprawnej pracy takich łączy. W oparciu o pewne doświadczenia eksploatacyjne z tego zakresu i na podstawie przedstawionej analizy zaproponowano koncepcję łącza dwufalowego, wskazując na wybrane długości fal do pracy łącza. W podsumowaniu wskazano na właściwości tego typu rozwiązań komunikacyjnych i na pola ich zastosowań w technice przesyłania informacji.
    The demand for implementation of digital data transmission lines in various topographies and field conditions is increasing. Such diversity requires many original solutions. Certainly one of the solutions are links that use free space to transmit information on optical wavelengths. The idea is not new, but the new optical and electronic technologies make this possible. The subject of investigations is to analyze the working conditions of optical links in open spaces. The issue is known in the literature as Free Space Optics Communication (FSO). In this paper there are presented the basic conditions for correct work of such links. On a basis of certain operating experience in this field and the presented analysis there was proposed the concept of a dual wavelength link with indicating the selected length waves for the link work . In the summary there are described the properties of such solutions in the fields of communications and their applications to information transmission technology.
    Źródło:
    Pomiary Automatyka Kontrola; 2012, R. 58, nr 12, 12; 1105-1109
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Peak detection unit for Free-Space-Optics receiver
    Autorzy:
    Achtenberg, Krzysztof
    Mikołajczyk, Janusz
    Szabra, Dariusz
    Prokopiuk, Artur
    Bielecki, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/221334.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    peak detection
    infrared receiver module for optical communications
    open path laser communications
    free space optics
    quantum cascade laser
    Opis:
    The paper presents verification of a peak detection method cooperating with infrared radiation detector module applications. The work has been divided into parts including SPICE simulations and presentation of results obtained with the constructed prototype. The design of the peak detector dedicated to applications with very short pulses requires a different approach than that for standard solutions. It is mainly caused due to the ratio of pulse width and time period. In the described application this ratio is less than 10%. The paper shows testing of an analogue circuit which is capable to be inserted in these applications.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 377-385
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Finite-Sized Aperture on the Performance of Differential Multihop DF-FSO Network
    Autorzy:
    Agarwal, Deepti
    Yadav, Poonam
    Powiązania:
    https://bibliotekanauki.pl/articles/2200711.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    differencial modulation
    K-distribution
    Free space optics (FSO)
    Average bit error rate (BER)
    Decode and forward relaying
    pointing error
    Opis:
    This paper investigates the differential binary modulation for decode-and-forward (DF) based relay-assisted free space optical (FSO) network under the effect of strong atmospheric turbulence together with misalignment error (ME). The atmospheric fading links experience K-distributed turbulence. First we derive novel closed form expression for average bit error rate (BER) and outage probability (OP) in terms of Meijer’s G function. Further, the OP of differential DF-FSO system with multiple relays is derived. We also analyze the asymptotic performance for the sake of getting the order of diversity and the coding gain. The power allotment term is utilized to examine the effect of different power allotment techniques on BER and OP. The simulation results have been used to validate the derived analytical results.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 807--813
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of peak signal detection methods in nanosecond pulses monitoring
    Autorzy:
    Achtenberg, Krzysztof
    Mikołajczyk, Janusz
    Szabra, Dariusz
    Prokopiuk, Artur
    Bielecki, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/221035.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    peak detection
    pulse amplitude
    free space optics
    constant fraction discriminator
    leading edge discriminator
    sample and hold
    ADC
    fast acquisition
    Opis:
    The paper is a review of analog and digital electronics dedicated to monitor nanosecond pulses. Choosing the optimal peak detector construction depends on many factors for example precision, complexity, or costs. The work shows some virtues and limitations of selected peak detection methods, for example standard peak detector with rectifier, sample and hold circuit with triggering units and ADC fast acquisition. However, the main attention is paid to problems of results from effective triggering signal for sample and hold operation. The obtained results allow for designing a peak detector construction as an alternative for costly and very complex fast acquisition systems based on ADC and FPGA technologies.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 2; 203-218
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of MPPM FSO transmission over Gamma–Chi-square strong atmospheric turbulence
    Autorzy:
    Todorovic, Jelena
    Spalevic, Petar
    Panic, Stefan
    Abdullah, Majid Hamid
    Pantelic, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/2202766.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    FSO
    free space optics
    ABER
    average bit error rate
    MPPM
    multi-pulse pulse-position
    novel Gamma-Chi-square distribution
    channel model
    strong atmospheric turbulence
    Opis:
    In this paper, performance analysis of free space optical (FSO) system operating in conditions of strong atmospheric turbulence over Gamma–Chi-square turbulence model, has been carried out. We have observed reception over multi-pulse pulse-position (MPPM) modulation format for the case of strong atmospheric turbulence conditions modeled with Gamma–Chi-square turbulence model and have compared it with turbulence modeling distributions such are: Gamma–Gamma distribution, K-distribution, negative exponential distribution, log–normal distribution. First, we have provided closed-form analytical expressions for average bit error rate (ABER) at the reception for each observed case and then based on them, we have obtained numerical and Monte Carlo simulation results in order to observe turbulence level impact on system performance.
    Źródło:
    Optica Applicata; 2023, 53, 1; 111--126
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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