Wyniki wyszukiwania - BazTech

1

Research on the X-ray wavelength division multiplexing technology for blackout region communication

Li Yao, Su Tong, Sheng Lizhi, Xu Neng, Zhao Baosheng

Optica Applicata

|

2020

|

Vol. 50, nr 4

619--632

EN

After the concept of X-ray communication was proposed, its application in complex electromagnetic environment has received more attention, such as data transmission in re-enter special electro-magnetic condition. In this article, a new type of X-ray source was introduced firstly, which was expected to generate multiple characteristic lines and achieve wavelength division multiplexing technology in X-ray band. Then an experimental platform was built for analyzing transmission characteristics of X-ray photon in various plasma media. Finally, the calculation model for a link power equation was given. Experiment results show that transmittance of 8–18 keV X-ray signal is relatively stable, atomic numbers from 29 to 42 are the most suitable materials for wavelength division multiplexing, the X-ray communication system is expected to realize about 200 kbps data transmission rate in adjacent space.

2

Simulation platform for analyzing environmental effects in multi-wavelength transmission systems in matlab simulink

Róka Rastislav, Mokráň Martin

Przegląd Elektrotechniczny

|

2019

|

R. 95, nr 6

9--14

EN

For reliable communication of multi-wavelength transmission systems, significant environmental effects on transmitted information signals must be investigated and analyzed. This paper presents a specific simulation platform that allows analyzing environmental effects due to the optical transmission medium at the multi-wavelength signal transmission. This simulation platform represents the signal transmission in the optical singlemode fiber medium for both CWDM and DWDM systems with four wavelength channels and allows analyzing the impact of optical transmission medium on transmitted multi-wavelength information signals.

PL

Dla niezawodnej komunikacji transmisji o wielu długościach fali powinien być analizowany efekt wpływu środowiska. W artykule zaprezentowano metodę symulacji umożliwiającą analizę z transmisją światłowodową typu CWDM i DWDM z czterema kanałami.

3

Crosstalk Noise Aware System For WDM-Based Optical Network on Chip

Jedidi Ahmed

International Journal of Electronics and Telecommunications

|

2019

|

Vol. 65, No. 3

497--505

EN

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.

4

Performance analysis of two-dimensional photonic crystal octagonal ring resonator based eight channel demultiplexer

Kannaiyan V., Dhamodharan S. K., Savarimuthu R.

Optica Applicata

|

2017

|

Vol. 47, nr 1

7--18

EN

We proposed a high performance eight channel demultiplexer using two-dimensional photonic crystal octagonal ring resonator for wavelength division multiplexing applications. The performance parameters such as transmission efficiency, Q factor, spectral width, resonant wavelength, crosstalk and channel spacing of the proposed demultiplexers are evaluated. The plane wave expansion method manipulates photonic band gap of periodic and non-periodic structure. Finite-difference time-domain method is used to evaluate the performance parameters of designed two-dimensional photonic crystal structure. The proposed demultiplexer provides overall transmission efficiency, Q factor, spectral width of about 98%, 1968 and 0.8 nm, respectively. The ultra-compact eight channel demultiplexer performs better than the reported one. Hence this work can be implemented for real time applications.

5

100G shortwave wavelength division multiplexing solutions for multimode fiber data links

Cimoli B., Estaran Tolosa J. M., Rodes Lopez G. A., Vegas Olmos J. J., Monroy I. T.

Optica Applicata

|

2016

|

Vol. 46, nr 3

409--419

EN

We investigate an alternative 100G solution for optical short-range data center links. The presented solution adopts wavelength division multiplexing technology to transmit four channels of 25G over a multimode fiber. A comparative performance analysis of the wavelength-grid selection for the wavelength division multiplexing data link is reported. The analysis includes transmissions over standard optical multimode fiber (OM): OM2, OM3 and OM4.

6

RoFnet - Reconfigurable Radio over Fiber Network Architecture Overview

Medeiros M., Avó R., Laurencio P., Correia N., Barradas A.

Journal of Telecommunications and Information Technology

|

2009

|

nr 1

38-43

EN

This paper introduces the basic operational concepts of the RoFnet - reconfigurable radio over fiber network, which is a project supported by the Portuguese Foundation forScience and Technology. This project proposes an innovative radio over fiber optical access network architecture, which combines a low cost base station (BS) design, incorporating reflective semiconductor optical amplifiers, with fiber dispersion mitigation provided by optical single sideband modulation techniques. Optical wavelength division multiplexing (WDM) techniques are used to simplify the access network architecture allowing for different BSs to be fed by a common fiber. Different wavelength channels can be allocated to different BSs depending on user requirements. Additionally, in order to improve radio coverage within a cell, it is considered a sectorized antenna interface. The combination of subcarrier multiplexing with WDM, further simplifies the network architecture, by using a specific wavelength channel to feed an individual BS and different subcarriers to drive the individual antenna sectors within the BS.

7

Optical communications research in the Institute of Telecommunication of the Warsaw University of Technology

Siuzdak J., Holejko K., Kowalski A.

Opto-Electronics Review

|

2000

|

Vol. 8, No. 2

189-193

EN

The paper presents research areas in optical telecommunications in which the Microwave and Optoelectronics Systems Division was involved throughout last years. This division is a part of the Institute of Telecommunication of Warsaw University of Technology. The following systems and instruments developed in the division are concisely described: a coherent optical communication system, an optical WDM system, an open space optical CDMA system, a DTS modification, an OTDR, and a visibility meter.