scholarly journals A Novel Method of Designing an all Optical 3-Bit Asynchronous Counter

2021 ◽  
Author(s):  
Manas Kumar Garai ◽  
Mrinal Kanti Mandal ◽  
SISIR KUMAR GARAI
Keyword(s):  
Communication Network ◽  
Data Communication ◽  
Digital Signal ◽  
Pulse Number ◽  
Binary Counter ◽  
All Optical ◽  
Frequency Encoding ◽  
Novel Method ◽  
Optical Domain ◽  
Switching Characteristics

Abstract In digital signal processing and data communication system in optical domain it is paramount important to count the pulse number of any device or processor and hence optical counter for fast counting. In this letter the authors propose a new method to implement an all-optical 3- bit asynchronous binary counter comprising all-optical T flip flops which works based on the polarization switching characteristics of SOA, and frequency encoded data have been used for communication purpose. Use of Frequency encoding technique in the proposed scheme makes it attractive and effective one in various aspects in wave division multiplexing based communication network. Simulation aided results support the practicability of the proposed scheme.

scholarly journals A 40 Mb/s VLC System Reusing an Existing Large LED Panel in an Indoor Office Environment

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1697
Author(s):  
Xicong Li ◽  
Zabih Ghassemlooy ◽  
Stanislav Zvánovec ◽  
Paul Anthony Haigh
Keyword(s):  
Modulation Depth ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Data Communication ◽  
Experimental System ◽  
Digital Signal ◽  
Visible Light Communication ◽  
Cost Driver ◽  
Limiting Factors ◽  
Light Sources

With advances in solid-state lighting, visible light communication (VLC) has emerged as a promising technology to enhance existing light-emitting diode (LED)-based lighting infrastructure by adding data communication capabilities to the illumination functionality. The last decade has witnessed the evolution of the VLC concept through global standardisation and product launches. Deploying VLC systems typically requires replacing existing light sources with new luminaires that are equipped with data communication functionality. To save the investment, it is clearly desirable to make the most of the existing illumination systems. This paper investigates the feasibility of adding data communication functionality to the existing lighting infrastructure. We do this by designing an experimental system in an indoor environment based on an off-the-shelf LED panel typically used in office environments, with the dimensions of 60 × 60 cm2. With minor modifications, the VLC function is implemented, and all of the modules of the LED panel are fully reused. A data rate of 40 Mb/s is supported at a distance of up to 2 m while using the multi-band carrierless amplitude and phase (CAP) modulation. Two main limiting factors for achieving higher data rates are observed. The first factor is the limited bandwidth of the LED string inside the panel. The second is the flicker due to the residual ripple of the bias current that is generated by the panel’s driver. Flicker is introduced by the low-cost driver, which provides bias currents that fluctuate in the low frequency range (less than several kilohertz). This significantly reduces the transmitter’s modulation depth. Concurrently, the driver can also introduce an effect that is similar to baseline wander at the receiver if the flicker is not completely filtered out. We also proposed a solution based on digital signal processing (DSP) to mitigate the flicker issue at the receiver side and its effectiveness has been confirmed.

All-optical dense WDM wide-area communication network

2002 ◽  
Author(s):  
S.C. Chan ◽  
Minghua Lu ◽  
S.S. Udpa ◽  
L. Udpa ◽  
D.W. Jacobson
Keyword(s):  
Communication Network ◽  
Wide Area ◽  
Dense Wdm ◽  
All Optical

DESIGNING OF ALL-OPTICAL TRI-STATE LOGIC SYSTEM WITH THE HELP OF OPTICAL NONLINEAR MATERIAL

2008 ◽  
Vol 17 (03) ◽  
pp. 315-328 ◽  
Author(s):  
TANAY CHATTOPADHYAY ◽  
GOUTAM KUMAR MAITY ◽  
JITENDRA NATH ROY
Keyword(s):  
High Speed ◽  
Optical Switch ◽  
Digital Signal ◽  
Optical Signal ◽  
Nonlinear Material ◽  
Digital Signals ◽  
Photonic Networks ◽  
Optical Nonlinear Material ◽  
All Optical ◽  
Logic Operations

Nonlinear optics has been of increased interest for all-optical signal, data and image processing in high speed photonic networks. The application of multi-valued (nonbinary) digital signals can provide considerable relief in transmission, storage and processing of a large amount of information in digital signal processing. Here, we propose the design of an all-optical system for some basic tri-state logic operations (trinary OR, trinary AND, trinary XOR, Inverter, Truth detector, False detector) which exploits the polarization properties of light. Nonlinear material based optical switch can play an important role. Tri-state logic can play a significant role towards carry and borrow free arithmetic operations. The principles and possibilities of the design of nonlinear material based tri-state logic circuits are proposed and described.

PARALLEL FFT ALGORITHMS ON NETWORK-ON-CHIPS

2009 ◽  
Vol 18 (02) ◽  
pp. 255-269 ◽  
Author(s):  
JUN HO BAHN ◽  
JUNG SOOK YANG ◽  
WEN-HSIANG HU ◽  
NADER BAGHERZADEH
Keyword(s):  
Data Communication ◽  
Digital Signal ◽  
Variable Number ◽  
Data Locality ◽  
Communication Traffic ◽  
On Chip ◽  
Fft Algorithms ◽  
Signal Processors ◽  
Parallel Fft ◽  
Parallel Fft Algorithm

This paper presents parallel FFT algorithms with different degree of computation and communication overheads for multiprocessors in a Network-on-Chip (NoC) environment. Of the three parallel FFT algorithms presented in this paper, we propose two parallel FFT algorithms for a 2D NoC that can contain a variable number of processing elements (PEs) and one is a reference parallel FFT algorithm for comparison. A parallel FFT algorithm we propose increases performance by assigning well-balanced computation tasks to PEs. The execution times are reduced because the algorithm uses data locality well to avoid unnecessary data exchanges among PEs and removes the overall idle periods by2 a balanced task scheduling. An enhanced version of this algorithm is suggested in which communication traffic is reduced. In this algorithm, returning transformed data to an original PE after one computation stage before sending them to a next PE for the following stage is removed. Instead, we propose a method that enables to keep regularity of the data communication and computations with twiddle factors. According to the simulation result from our cycle-accurate SystemC NoC model with a parametrizable 2-D mesh architecture, and the analysis of the algorithms in time and complexity, our proposed algorithms are shown to outperform the reference parallel FFT algorithm and FFT implementations on TI Digital Signal Processors (DSPs) that have similar specifications to our simulation environment.

Research on Power Communication Network Integrated All-Optical Switching

2014 ◽  
Vol 940 ◽  
pp. 362-365
Author(s):  
Wen Shen ◽  
Hui Deng ◽  
Wei Wang ◽  
Hai Yu
Keyword(s):  
Communication Network ◽  
Optical Switching ◽  
Bandwidth Utilization ◽  
Optical Technology ◽  
Common Features ◽  
Network Availability ◽  
All Optical ◽  
All Optical Technology ◽  
Business Requirements ◽  
All Optical Switching

In this paper, we give an introduction to all-optical switching in power communication network. We apply the all-optical technology into electric power communication network. Edge node is designed to complete the optical packet optical packet generation and split into groups of common features. The core node is designed to forward optical packet to complete way finding functionality. All-optical technology shows advantages in protecting the transmission of real-time business requirements to maximize bandwidth utilization and network availability.

scholarly journals The Wireless Acquisition Data System Simulator Design on Automatic Weather Monitoring Station

2019 ◽  
Vol 1 (3) ◽  
pp. 51-62
Author(s):  
Siti Aminah ◽  
Asep Deni Mulyadi ◽  
Yuliadi Erdani
Keyword(s):  
Data Communication ◽  
Digital Signal ◽  
Data System ◽  
Communication Process ◽  
Monitoring Station ◽  
Long Distance ◽  
Modulation And Demodulation ◽  
Shift Keying ◽  
Simulator Design ◽  
Weather Parameters

The Wireless Acquisition Data System Simulator Design on Automatic Weather Monitoring Station is means of collecting, monitoring, and controlling some long distance subsystems. Automatic weather monitoring station is device for receiving data by a censor in use to gauge some weather parameters. In this Research we develop an automatic weather monitoring station design simulator by creating a subsystem in the form of prototype, using Digital Pin and Analog Pin from the microcontroller. Sensor characteristics are considered to measure several weather parameters. The principles of a system function are it will have to collect data from some subsystems to accommodate in a database, able to control and deliver instructions to the subsystem. The communication system makes the use of radio frequency by means of Frequency Shift Keying (FSK) method through Handy Talky (HT), picked out because advantages of lower power consumptions and long range of transmission. Additional advantages are, although catastrophes, data communication using HT allows to keep fast transmission. The transmission of data using HT media require a signal converter by which HT is operated by analogue signal (sound), while censor and microcontroller by digital signal and, therefore, Modulation and Demodulation techniques are necessary. The Modulation functions to convert digital signal into analogue, and just the opposite to the Demodulation, the Modulation and Demodulation processes  is using IC TCM3105. The results of the trial suggest that system design has proper functions, the communication process in this system is two-ways communication, the process was fast working in either transmitter mode or receiver mode.

scholarly journals Baseband I/Q regeneration Method for Direct Conversion Receiver to nullify effect of I/Q mismatch

2016 ◽  
Vol 5 (3) ◽  
pp. 50 ◽  
Author(s):  
M. Shah ◽  
S. Gupta
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Low Power ◽  
Digital Signal ◽  
Direct Conversion ◽  
Performance Degradation ◽  
Wireless Receiver ◽  
Novel Method ◽  
The One

Direct Conversion Receiver is the choice of the today’s designer for low power compact wireless receiver. DCR is attractive due to low power, small size and highly monolithic integratable structure, but distortions affect its performance.  I/Q mismatch is the one of the major distortion which is responsible for performance degradation.  In this paper, a novel method for Direct Conversion Receiver is suggested, which makes it insensitive to the I/Q mismatch. Here the classical homodyne architecture is modified to nullify effect of I/Q mismatch. The proposed method can be implemented in the Digital Signal Processing (DSP) back-end section also.  This feature makes it acceptable in the already designed/functioning classical homodyne architecture based receiver.

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