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    Wyświetlanie 1-10 z 10
    Tytuł:
    Simulating the effects of refractive index difference on the coupling efficiency of periodically segmented waveguide mode converter
    Autorzy:
    Zheng, Yu
    He, Hao
    Jiang, Lianqiong
    Duan, Ji'an
    Tematy:
    coupling efficiency
    silica waveguide
    planar lightwave circuit
    micro-optical waveguide
    nano-optical waveguide
    Pokaż więcej
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Powiązania:
    https://bibliotekanauki.pl/articles/2033880.pdf  Link otwiera się w nowym oknie
    Opis:
    Efficient coupling of micro/nano-optical waveguides with single-mode fibers is the premise for the efficient operation of the integrated photonic chip, which directly determines its optical performance. In this paper, the design principles of periodically segmented waveguide (PSW) structure used for high-efficiency fiber-chip coupling are proposed, and the effects of refractive index difference Δ on coupling efficiency and structural parameters are studied by simulation. It is found that as the Δ of the PSW increases, the period of the PSW tends to be smaller, and the coupling efficiency decreases continuously, reduced by around 0.673 dB in the range of Δ = 3% to Δ = 7%. Through the analysis of PSW optical mechanisms, it demonstrates that the main reason for the decrease of coupling efficiency is that the transmission loss of the tapered section increases sharply with the increase of Δ. High-Δ PSW is difficult to apply to highly integrated silica optical chips due to the unignorably insertion loss.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent advances in mode converters for a mode division multiplex transmission system
    Autorzy:
    Memon, A. K.
    Chen, K. X.
    Tematy:
    integrated optical device
    mode converters
    mode division multiplex
    optical waveguide
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Powiązania:
    https://bibliotekanauki.pl/articles/1818205.pdf  Link otwiera się w nowym oknie
    Opis:
    Adopting mode division multiplex (MDM) technology as the next frontier for optical fiber communication and on-chip optical interconnection systems is becoming very promising because of those remarkable experimental results based on MDM technology to enhance capacity of optical transmission and, hence, making MDM technology an attractive research field. Consequently, in recent years the large number of new optical devices used to control modes, for example, mode converters, mode filters, mode (de)multiplexers, and mode-selective switches, have been developed for MDM applications. This paper presents a review on the recent advances on mode converters, a key component usually used to convert a fundamental mode into a selected high-order mode, and vice versa, at the transmitting and receiving ends in the MDM transmission system. This review focuses on the mode converters based on planar light wave circuit (PLC) technology and various PLC-based mode converters applied to the above two systems and realized with different materials, structures, and technologies. The basic principles and performances of these mode converters are summarized.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission of Ultrasonic Waves Via Optical Silica Glass Fiber Doped by 7.5% of TiO2 with the Use of Power Sandwich Transducer
    Autorzy:
    Muc, S.
    Gudra, T.
    Tematy:
    ultrasounds
    transmission of acoustic wave in an optical waveguide
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/177364.pdf  Link otwiera się w nowym oknie
    Opis:
    The possibility of acoustic wave propagation in optical waveguides creates new prospects for simultaneous transmission of laser beams and ultrasonic waves. Combined laser-ultrasonic technology could be useful in e.g. surgical treatment. The article presents the results of experimental studies of transmission of ultrasonic wave in optical fibres, the core of which is doped by 7.5% of TiO2, using a sandwichtype transducer. It also presents amplitude characteristics of an ultrasonic signal propagated in the optical fibre. Authors studied the effect which the length of the fibre has on the achieved output signal amplitudes. They presented the relation of the output signal amplitude from a capacitive sensor to the power applied to the sandwich-type transducer. The obtained results were compared with the results produced when using an optical fibre with a core doped by 3% of GeO2, in order to select optical fibre suitable for simultaneous transmission of ultrasonic waves and laser rays.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of planar multimode optical sensor with active nanolayer
    Autorzy:
    Błahut, Marek
    Tematy:
    multimode interference
    optical sensor
    planar waveguide
    Pokaż więcej
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Powiązania:
    https://bibliotekanauki.pl/articles/1835808.pdf  Link otwiera się w nowym oknie
    Opis:
    In the paper, numerical studies of the model of an optical sensor, based on interference of modes in a planar one-dimensional step-index configuration, are presented. Calculations are performed using the method of mode field analysis. The structure consists of the single-mode input waveguide, the multimode waveguide that guides only a few modes and the single-mode output waveguide.The structure is covered by a nanometer active sensor layer of a high refractive index, which changes its optical properties in contact with the measured external surrounding. The refractive index variation of an active sensor layer affects the modal properties of the multimode waveguide and the output optical field distribution. By the proper selection of the active layer, the considered configuration can be used for gas detection.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crosstalk Noise Aware System For WDM-Based Optical Network on Chip
    Autorzy:
    Jedidi, Ahmed
    Tematy:
    optical network on chip
    wavelength division multiplexing
    crosstalk noise
    detection crosstalk
    waveguide
    optical router
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/225975.pdf  Link otwiera się w nowym oknie
    Opis:
    Network on chip (NoC) is presented as a promising solution to face off the growing up of the data exchange in the multiprocessor system-on-chip (MPSoC). However, the traditional NoC faces two main problems: the bandwidth and the energy consumption. To face off these problems, a new technology in MPSoC, namely, optical network-on-chip (ONoC) has been introduced which it uses the optical communication to guaranty a high performance in communication between cores. In addition, wavelength division multiplexing (WDM) is exploited in ONoC to reach a high rate of bandwidth. Nevertheless, the transparency nature of the ONoC components induce crosstalk noise to the optical signals, which it has a direct effect to the signal-to-noise ratio (SNR) then decrease the performance of the ONoC. In this paper, we proposed a new system to control these impairments in the network in order to detect and monitor crosstalk noise in WDM-based ONoC. Furthermore, the crosstalk monitoring system is a distributed hardware system designed and test with the different optical components according the various network topology used in ONoC. The register-transfer level (RTL) hardware design and implementation of this system can result in high reliability, scalability and efficiency with running time less than 20 ms.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of coupling effect between a unidirectional air waveguide and two cavities with one-way rotating state
    Autorzy:
    Gao, Yongfeng
    He, Liu
    Jiang, Zhen
    Zhou, Jun
    Shi, Yuejia
    Bai, Wenfang
    Tematy:
    waveguide-cavity coupling
    magneto-optical photonic crystal
    unidirectional air waveguide
    one-way rotating state
    finite element method
    Pokaż więcej
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Powiązania:
    https://bibliotekanauki.pl/articles/174202.pdf  Link otwiera się w nowym oknie
    Opis:
    In the paper we present an implementation of resonance coupling between a unidirectional air waveguide and two cavities with one-way rotating state in a two-dimensional dielectric photonic crystal and a magneto-optical photonic crystal. We theoretically calculate the dispersion curves of the line defect waveguide and the dispersion curves of waveguide-cavity interaction, respectively. Numerical simulations show that, via waveguide-cavity coupling, a series of interesting resonance phenomena can be generated in the system. By modifying direction of the applied external magnetic field, storing and discharging of photonic energy can be realized. Our work may provide a practical and useful guidance for optical communications.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photorefractive multiple quantum wells planar waveguide
    Światłowód planarny z warstwą fotorefrakcyjnych studni kwantowych
    Autorzy:
    Weinert-Rączka, E.
    Gajda, J.
    Wichtowski, M.
    Ziółkowski, A.
    Tematy:
    nieliniowe światłowody
    fotorefrakcyjne studnie kwantowe
    całkowicie optyczne przełączanie
    nonlinear waveguide
    photorefractive multiple quantum wells
    all-optical switching
    Pokaż więcej
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Powiązania:
    https://bibliotekanauki.pl/articles/156988.pdf  Link otwiera się w nowym oknie
    Opis:
    New type of planar optical waveguide with a guiding layer consisting of photorefractive multiple quantum well structure is investigated. Results of optical and electro-optical measurements and possible applications for all-optical switching of guided signals are presented.
    Opisano nowy rodzaj światłowodu planarnego o warstwie prowadzącej zawierającej fotorefrakcjne studnie kwantowe. Przedstawione są wyniki pomiarów własności optycznych i elektro-optycznych układu oraz pokazane możliwości zastosowania do całkowicie optycznego przełączania sygnałów propagujących się w światłowodzie.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compact Transverse Electric Silicon-on-Insulator Mode Converter for Mode-Division Multiplexer
    Autorzy:
    Sharaf, Mohamed H.
    El-Mashade, Mohamed B.
    Emran, Ahmed A.
    Tematy:
    integrated optics
    silicon-on-insulator waveguide
    WDM & MDM systems
    perturbation theory
    integrated optical
    devices
    hybrid modes
    guided waves
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/2055263.pdf  Link otwiera się w nowym oknie
    Opis:
    On-chip optical-interconnect technology emerges as an attractive approach due to its ultra-large bandwidth and ultra-low power consumption. Silicon-on-insulator (SOI) wire waveguides, on the other hand, have been identified to potentially replace copper wires for intra-chip communication. To take advantage of the wide bandwidth of SOI waveguides, wavelengthdivision multiplexing (WDM) has been implemented. However, WDM have inherent drawbacks. Mode-division multiplexing (MDM) is a viable alternative to WDM in MIMO photonic circuits on SOI as it requires only one carrier wavelength to operate. In this vein, mode converters are key components in on-chip MDM systems. The goal of this paper is to introduce a transverse electric mode converter. The suggested device can convert fundamental transverse electric modes to first-order transverse electric ones and vice versa. It is based on small material perturbation which introduces gradual coupling between different modes. This device is very simple and highly compact; the size of which is 3 μm². Mathematical expressions for both the insertion loss and crosstalk are derived and optimized for best performance. In addition, three-dimensional finite-difference time-domain (3D-FDTD) simulations are performed in order to verify the mathematical model of the device. Our numerical results reveal that the proposed device has an insertion loss of 1.2 dB and a crosstalk of 10.1 dB. The device’s insertion loss can be decreased to 0.95 dB by adding tapers to its material perturbation.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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