This document describes a proposed system for performing all-optical logic XOR and XNOR operations using dark-bright soliton conversion within an add/drop optical filter system. Dark and bright soliton pulses representing logic 0 and 1 are input into microring resonators and undergo dark-bright soliton conversion, which enables the simultaneous generation of XOR and XNOR outputs. Simulation results show that the system correctly performs XOR and XNOR operations on pseudo-random binary sequence inputs at 100 Gbit/s. The system provides a simple and flexible way to realize advanced optical logic circuits.
Analysis of cyclic prefix length effect on ISI limitation in OFDM system over...IJECEIAES
In this work, the influence of the cyclic prefix on the performance of the OFDM system is studied. We worked out an OFDM transceiver using a 16 QAM modulation scheme, a comparison of the BER for various lengths of the cyclic prefix has been achieved, and the influence of the noise introduced in the channel has been highlighted, for both a Gaussian and Rayleigh noise. The simulation was carried out on MATLAB where the curves of the BER for various lengths of the cyclic prefix are given and compared. We also adopted as a metric the QAM constellation to show the dispersion of the carriers as a consequence of the transmission channel, the mitigation of this effect by the CP is noticeable.
TWO DIMENSIONAL MODELING OF NONUNIFORMLY DOPED MESFET UNDER ILLUMINATIONVLSICS Design
A two dimensional numerical model of an optically gated GaAs MESFET with non uniform channel doping has been developed. This is done to characterize the device as a photo detector. First photo induced voltage (Vop) at the Schottky gate is calculated for estimating the channel profile. Then Poisson’s equation for the device is solved numerically under dark and illumination condition. The paper aims at developing the MESFET 2-D model under illumination using Monte Carlo Finite Difference method. The results discuss about the optical potential developed in the device, variation of channel potential under different biasing and illumination and also about electric fields along X and Y directions. The Cgs under different illumination is also calculated. It has been observed from the results that the characteristics of the device are strongly influenced by the incident optical illumination.
IOSR Journal of Applied Physics (IOSR-JAP) is an open access international journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Analysis of cyclic prefix length effect on ISI limitation in OFDM system over...IJECEIAES
In this work, the influence of the cyclic prefix on the performance of the OFDM system is studied. We worked out an OFDM transceiver using a 16 QAM modulation scheme, a comparison of the BER for various lengths of the cyclic prefix has been achieved, and the influence of the noise introduced in the channel has been highlighted, for both a Gaussian and Rayleigh noise. The simulation was carried out on MATLAB where the curves of the BER for various lengths of the cyclic prefix are given and compared. We also adopted as a metric the QAM constellation to show the dispersion of the carriers as a consequence of the transmission channel, the mitigation of this effect by the CP is noticeable.
TWO DIMENSIONAL MODELING OF NONUNIFORMLY DOPED MESFET UNDER ILLUMINATIONVLSICS Design
A two dimensional numerical model of an optically gated GaAs MESFET with non uniform channel doping has been developed. This is done to characterize the device as a photo detector. First photo induced voltage (Vop) at the Schottky gate is calculated for estimating the channel profile. Then Poisson’s equation for the device is solved numerically under dark and illumination condition. The paper aims at developing the MESFET 2-D model under illumination using Monte Carlo Finite Difference method. The results discuss about the optical potential developed in the device, variation of channel potential under different biasing and illumination and also about electric fields along X and Y directions. The Cgs under different illumination is also calculated. It has been observed from the results that the characteristics of the device are strongly influenced by the incident optical illumination.
IOSR Journal of Applied Physics (IOSR-JAP) is an open access international journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Software PLL for PLI synchronization, design, modeling and simulation , sozopoldpdobrev
Power-line interference is a common disturbing
factor in almost all two-electrode biosignal acquisition
applications. Many filtering procedures for mains
interference elimination are available, but all of them are
maximally effective when the filter notches are positioned
exactly at the power-line harmonics, i. e. when the sampling rate is synchronous with the power-line frequency. Moreover, various lock-in techniques, su ch as automatic common mode input impedance balance, require precise in-phase and quadrature phase references, synchronous with the power-line interference. This paper describes in depth a design procedure of software PLL, generating synchronous reference to the common mode power-line interference, and achieved from its analog prototype using s to z backward difference transformation. The main advantage of th e presented
approach is that the synchronization is done in software, so it has no production cost. The presented PLL is intended for use in ECG signal processing, but it can be used after easy adaptation in various digital si gnal processing applications, where frequency synchronization is needed.
Design and implementation of path planning algorithm for wheeled mobile robot...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Design and implementation of path planning algorithm for wheeled mobile robot...eSAT Journals
Abstract Path planning in mobile robots must ensure optimality of the path. The optimality achieved may be in path, time, energy consumed etc. Path planning in robots also depends on the environment in which it operates like, static or dynamic, known or unknown etc. Global path planning using A* algorithm and genetic algorithm is investigated in this paper. A known dynamic environment, in which a control station will compute the shortest path and communicate to the mobile robot and the mobile robot, will traverse through this path to reach the goal. The control station will keep track of the path traversed by the robot. The mobile robot navigates through the shortest path and if the robot detects any obstacle in the destined path, the mobile robot will update the information about the environment and this information together with the current location will be communicated to the control station. Then the control station, with the updated map of the environment and new starting location and destination recalculates the new shortest path, if any, and will communicate to the mobile robot so that it can reach the destination. The technique has been implemented and tested extensively in real-world experiments and simulation runs. The results demonstrate that the technique effectively calculates the shortest path in known dynamic environment and allows the robot to quickly accomplish the mission.
Design of Linear Array Transducer Using Ultrasound Simulation Program Field-IIinventy
This paper analyze the effect of number of elements of linear array and frequency influence the
image quality in a homogenous medium. Linear arrays are most common for conventional ultrasound imaging,
because of the advantages of electronic focusing and steering. Propagation of ultrasound in biological tissues is
of nonlinear in nature. But linear approximation in far-field is promising solution to model and simulate the
real time ultrasound wave propagation. The simulation of ultrasound imaging using linear acoustics has been
most widely used for understanding focusing, image formation and flow estimation, and it has become a
standard tool in ultrasound research. . In this paper the ultrasound field generated from linear array transducer
and propagation through biological tissues is modeled and simulated using FIELD II program.
Generation of Quantum Photon Information Using Extremely Narrow Optical Tweez...University of Malaya (UM)
A system of microring resonator (MRR) is presented to generate extremely narrow optical tweezers. An add/drop filter system consisting of one centered ring and one smaller ring on the left side can be used to generate extremely narrow pulse of optical tweezers. Optical tweezers generated by the dark-Gaussian behavior propagate via the MRRs system, where the input Gaussian pulse controls the output signal at the drop port of the system. Here the output optical tweezers can be connected to a quantum signal processing system (receiver), where it can be used to generate high capacity quantum codes within series of MRR’s and an add/drop filter. Detection of the encoded signals known as quantum bits can be done by the receiver unit system. Generated entangled photon pair propagates via an optical communication link. Here, the result of optical tweezers with full width at half maximum (FWHM) of 0.3 nm, 0.8 nm and 1.6 nm, 1.3 nm are obtained at the through and drop ports of the system respectively. These results used to be transmitted through a quantum signal processor via an optical computer network communication link.
Decimal Convertor Application for Optical Wireless Communication by Generatin...University of Malaya (UM)
Two systems consist of microring resonators (MRRs) and an add/drop filter are used to generate signals as localized multi wavelengths. Quantum dense encoding
can be performed by output signals of selected wavelengths incorporated to a polarization control system. Therefore dark and bright optical soliton pulses
with different time slot are generated. They can be converted into digital logic quantum codes using a decimal convertor system propagating along a wireless networks. Results show that multi soliton wavelength, ranged from 1.55 m to 1.56 m with FWHM and FSR of 10 pm and 600 pm can be generated respectively. Keywords- Micro Ring Resonator, Quantum Dense Coding (QDC), Wireless network communication system.
Cryptography Scheme of an Optical Switching System Using Pico/Femto Second So...University of Malaya (UM)
We propose a system of microring resonators (MRRs) incorporating with an add/drop filter system. Optical soliton can be simulated and used to generate entangled photon, applicable in single and multiple optical switching. Chaotic signals can be generated via the MRRs system. Therefore continuous spatial and temporal signals are generated spreading over the spectrum. Polarized photons are formed incorporating the
polarization control unit into the MRRs, which allows different time slot entangled photons to be randomly formed. Results show the single soliton pulse of 0.7 ps where the multi soliton pulse with FSR and FWHM of 0.6 ns and 20 ps are generated using the add/drop filter system. Here Ultra-short single soliton pulse with FWHM=42 fs can be simulated. These pulses are providing required communication signals to generate pair of polarization entangled photons among different time frame where the polarization control unit and polarizer beam splitter (PBS) are connected to the ring resonator system.
Secured Transportation of Quantum Codes Using Integrated PANDA-Add/drop and T...University of Malaya (UM)
New system of quantum cryptography for communication networks is proposed. Multi optical Soliton can be generated and propagated via an add/drop interferometer system incorporated with a time division multiple access (TDMA) system. Here the transportation of quantum codes is performed. Chaotic output signals from the PANDA ring resonator are inserted into the add/drop filter system. Using the add/drop filter system multi dark and bright solitons can be obtained and used to generate entangled quantum codes for internet security. In this research soliton pulses with FWHM and FSR of 325 pm and 880 nm are generated, respectively.
Software PLL for PLI synchronization, design, modeling and simulation , sozopoldpdobrev
Power-line interference is a common disturbing
factor in almost all two-electrode biosignal acquisition
applications. Many filtering procedures for mains
interference elimination are available, but all of them are
maximally effective when the filter notches are positioned
exactly at the power-line harmonics, i. e. when the sampling rate is synchronous with the power-line frequency. Moreover, various lock-in techniques, su ch as automatic common mode input impedance balance, require precise in-phase and quadrature phase references, synchronous with the power-line interference. This paper describes in depth a design procedure of software PLL, generating synchronous reference to the common mode power-line interference, and achieved from its analog prototype using s to z backward difference transformation. The main advantage of th e presented
approach is that the synchronization is done in software, so it has no production cost. The presented PLL is intended for use in ECG signal processing, but it can be used after easy adaptation in various digital si gnal processing applications, where frequency synchronization is needed.
Design and implementation of path planning algorithm for wheeled mobile robot...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Design and implementation of path planning algorithm for wheeled mobile robot...eSAT Journals
Abstract Path planning in mobile robots must ensure optimality of the path. The optimality achieved may be in path, time, energy consumed etc. Path planning in robots also depends on the environment in which it operates like, static or dynamic, known or unknown etc. Global path planning using A* algorithm and genetic algorithm is investigated in this paper. A known dynamic environment, in which a control station will compute the shortest path and communicate to the mobile robot and the mobile robot, will traverse through this path to reach the goal. The control station will keep track of the path traversed by the robot. The mobile robot navigates through the shortest path and if the robot detects any obstacle in the destined path, the mobile robot will update the information about the environment and this information together with the current location will be communicated to the control station. Then the control station, with the updated map of the environment and new starting location and destination recalculates the new shortest path, if any, and will communicate to the mobile robot so that it can reach the destination. The technique has been implemented and tested extensively in real-world experiments and simulation runs. The results demonstrate that the technique effectively calculates the shortest path in known dynamic environment and allows the robot to quickly accomplish the mission.
Design of Linear Array Transducer Using Ultrasound Simulation Program Field-IIinventy
This paper analyze the effect of number of elements of linear array and frequency influence the
image quality in a homogenous medium. Linear arrays are most common for conventional ultrasound imaging,
because of the advantages of electronic focusing and steering. Propagation of ultrasound in biological tissues is
of nonlinear in nature. But linear approximation in far-field is promising solution to model and simulate the
real time ultrasound wave propagation. The simulation of ultrasound imaging using linear acoustics has been
most widely used for understanding focusing, image formation and flow estimation, and it has become a
standard tool in ultrasound research. . In this paper the ultrasound field generated from linear array transducer
and propagation through biological tissues is modeled and simulated using FIELD II program.
Generation of Quantum Photon Information Using Extremely Narrow Optical Tweez...University of Malaya (UM)
A system of microring resonator (MRR) is presented to generate extremely narrow optical tweezers. An add/drop filter system consisting of one centered ring and one smaller ring on the left side can be used to generate extremely narrow pulse of optical tweezers. Optical tweezers generated by the dark-Gaussian behavior propagate via the MRRs system, where the input Gaussian pulse controls the output signal at the drop port of the system. Here the output optical tweezers can be connected to a quantum signal processing system (receiver), where it can be used to generate high capacity quantum codes within series of MRR’s and an add/drop filter. Detection of the encoded signals known as quantum bits can be done by the receiver unit system. Generated entangled photon pair propagates via an optical communication link. Here, the result of optical tweezers with full width at half maximum (FWHM) of 0.3 nm, 0.8 nm and 1.6 nm, 1.3 nm are obtained at the through and drop ports of the system respectively. These results used to be transmitted through a quantum signal processor via an optical computer network communication link.
Decimal Convertor Application for Optical Wireless Communication by Generatin...University of Malaya (UM)
Two systems consist of microring resonators (MRRs) and an add/drop filter are used to generate signals as localized multi wavelengths. Quantum dense encoding
can be performed by output signals of selected wavelengths incorporated to a polarization control system. Therefore dark and bright optical soliton pulses
with different time slot are generated. They can be converted into digital logic quantum codes using a decimal convertor system propagating along a wireless networks. Results show that multi soliton wavelength, ranged from 1.55 m to 1.56 m with FWHM and FSR of 10 pm and 600 pm can be generated respectively. Keywords- Micro Ring Resonator, Quantum Dense Coding (QDC), Wireless network communication system.
Cryptography Scheme of an Optical Switching System Using Pico/Femto Second So...University of Malaya (UM)
We propose a system of microring resonators (MRRs) incorporating with an add/drop filter system. Optical soliton can be simulated and used to generate entangled photon, applicable in single and multiple optical switching. Chaotic signals can be generated via the MRRs system. Therefore continuous spatial and temporal signals are generated spreading over the spectrum. Polarized photons are formed incorporating the
polarization control unit into the MRRs, which allows different time slot entangled photons to be randomly formed. Results show the single soliton pulse of 0.7 ps where the multi soliton pulse with FSR and FWHM of 0.6 ns and 20 ps are generated using the add/drop filter system. Here Ultra-short single soliton pulse with FWHM=42 fs can be simulated. These pulses are providing required communication signals to generate pair of polarization entangled photons among different time frame where the polarization control unit and polarizer beam splitter (PBS) are connected to the ring resonator system.
Secured Transportation of Quantum Codes Using Integrated PANDA-Add/drop and T...University of Malaya (UM)
New system of quantum cryptography for communication networks is proposed. Multi optical Soliton can be generated and propagated via an add/drop interferometer system incorporated with a time division multiple access (TDMA) system. Here the transportation of quantum codes is performed. Chaotic output signals from the PANDA ring resonator are inserted into the add/drop filter system. Using the add/drop filter system multi dark and bright solitons can be obtained and used to generate entangled quantum codes for internet security. In this research soliton pulses with FWHM and FSR of 325 pm and 880 nm are generated, respectively.
Dark-Bright Solitons Conversion System for Secured and Long Distance Optical ...University of Malaya (UM)
We suggest a new purpose of a security scheme by employing the nonlinear behaviors of temporal dark and bright solitons amongst a micro-ring resonator system for signal security application. The chaotic signal is generated, where the required bright soliton pulse can be recovered and discovered by an add/drop filtering device. By using the reserve ring parameters, simulation results obtained have demonstrated that the soliton conversion can be performed. In application, the chaotic signal is generated and formed by the dark soliton inside a nonlinear micro-ring device. The different temporal soliton response time can be seen, the response times of 169 and 84 ns are mentioned for temporal dark and bright solitons, respectively, which can also be used to figure the security key. The technique of optical conversion can be use to improve the optical communication network systems.
Long Distance Communication Using Localized Optical Soliton via Entangled Ph...University of Malaya (UM)
A system of microring resonators (MRRs) is presented to generation entangled photon. Different time slot for continuous variable quantum key distribution (CVQKD) use is applicable in optical wireless link. Chaotic behavior of a soliton pulse within the device can be presented respect to the Kerr nonlinear type of light in the MRR devices. Continuous spatial and temporal signals are generated spreading over the spectrum. The CVQKD is formed using the localized spatial soliton pulse. Here localized temporal soliton with FWHM and FSR of 0.2 ps and 0.58 ns is obtained respectively. The spatial soliton pulse has a FWHM of 80 pm. Transmission of soliton pulse with FWHM of 1.5 ps is simulated along the long distance fiber optics where the polarized photons are formed incorporating with the polarization control unit into the MRRs, which allows different time slot entangled photons to be randomly formed.
Integrated ring resonator system analysis to Optimize the soliton transmissionPremier Publishers
The chaotic signals can be generated within the microring resonator (MRR) system when the Gaussian pulse with input power of 120 mW is inserted into the system. Generation of chaotic signals respect to the ring's radius has been studied. The coupling coefficient affects the output power significantly, thus in order to generate signals with higher output power, the smaller coupling coefficient can be used. Here the output power of the system is characterized with respect to the different coupling coefficients of the system.A series of MRRs connected to an add/drop filter system in order to anaylize the soliton signals. The nonlinear refractive index of the MRR is n2=2.2 x 10-17 m2/W. The capacity of the output signals can be increased through generation of peaks with smaller full width at half maximum (FWHM). Here, we generate and characterize the ultra-short optical soliton pulses respect to the ring's radius and coupling coefficients variation of the system. As result, soliton pulses with FWHM and free spectral range (FSR) of 50 pm and 1440 pm are generated.
Characterization Of Switchable And Multilayered FSS Circuits Using The WCIP M...IJERA Editor
In this paper, we use the Wave Concept Iterative Procedure (WCIP) to study the Switchable and multilayered
FSS (Frequency Selective Surface) circuits. The Switchable part is used for the adjustment of the frequency of
the HF Electronics Circuits. This adjustment is applied by the integration of RF-MEMS switches. This system is
based on the use of circuit fabrication processes included. In order to initialize the iterative procedure, an
incident wave is defined in the spectral domain
Soliton comb generation using add-drop ring resonatorsPremier Publishers
Add-drop ring resonator system is the fundamental building block of the optical transmission and communication systems. The microring resonator (MRR) made of semiconductor with a length of 750 μm, K1=k2= 0.02, is used to filter the input spectrum of Gaussian laser beam and generate the comb frequency of soliton pulses, where the transmission characteristics and group delay profile of the through and drop port output signals are presented. The semiconductor material (InGaAsP/InP) is used to generate the add-drop ring resonator. The operating wavelength is 1550 nm andthe iterative method is used to generate the results based on practical parameters of the system.
Multiple inputs all-optical logic gates based on nanoring insulator-metal-in...IJECEIAES
In this paper, we report new nanoscale plasmonic multiple inputs logic gates based on insulator-metal-insulator (IMI) nanoring waveguides. The proposed all-optical gates are numerically analyzed by the finite element method. NOT, AND, NAND, NOR, and EX-NOR all-optical logic gates were suitably designed and investigated based on the linear interface between the propagated waves through the waveguides. The operation wavelength was 1550 nm. The simulation results show that the optical transmission threshold of (0.26) which performs the operation of planned logic gates is accomplished. Moreover, simulation results show that our compact structure of all-optical logic gates may have potential applications in all-optical integrated networks
Outage performance of underlay cognitive radio networks over mix fading envir...IJECEIAES
In this paper, the underlay cognitive radio network over mix fading environment is presented and investigated. A cooperative cognitive system with a secondary source node S, a secondary destination node D, secondary relay node Relay, and a primary node P are considered. In this model system, we consider the mix fading environment in two scenarios as Rayleigh/ Nakagami-m and Nakagami-m/Rayleigh Fading channels. For system performance analysis, the closed-form expression of the system outage probability (OP) and the integral-formed expression of the ergodic capacity (EC) are derived in connection with the system's primary parameters. Finally, we proposed the Monte Carlo simulation for convincing the correctness of the system performance.
Tunable and Storage Potential Wells using Microring Resonator System for Bioc...University of Malaya (UM)
In this work, we propose the technique that can be used to trap/delivery bio-cell by using the concept of dark solitons and potential well, in which the trapping force is formed by using the intense optical vortices generated within the series ring and the PANDA ring resonator, the microscopic bio-cell can be trapped and moved dynamically, in which the valley of the dark soliton is generated and controlled within the PANDA ring resonator by the control port signals.
ASK-to-PSK Generation based on Nonlinear Microring Resonators Coupled to One ...University of Malaya (UM)
We present a new concept of ASK-to-PSK generation based on nonlinear microring resonators coupled to one MZI arm by using OptiWave FDTD method. By microring resonator increase from one to three microring (SR to TR), we found that the amplitude shift keying (ASK) are increase exactly and the phase shift keying (PSK) is equal to π.
All-optical logic XOR/XNOR gate operation using microring and nanoring reson...University of Malaya (UM)
In this paper, a novel system of simultaneous optical logic AND and OR gates using dark -bright soliton conversion within the add/drop optical filter system is proposed. The input logic „0‟ and control logic „0‟ are formed by using the dark soliton pulse (D) trains. By using the dark-bright soliton conversion behavior within the π/2 phase shift device, we found that the simultaneous optical logic AND and OR gates at the drop and through ports can be randomly formed, respectively.
Simulation and Analysis of Multisoliton Generation Using a PANDA Ring Resonat...University of Malaya (UM)
A novel system of multisoliton generation using nonlinear equations of the propagating signals is presented. This system uses a PANDA ring resonator incorporated with an add/drop filter system. Using resonant conditions, the intense optical fields known as multisolitons can be generated and propagated within a Kerr-type nonlinear medium. The present simulation results show that multisolitons can be controlled by using additional Gaussian pulses input into the add port of the PANDA system. For the soliton pulse in the microring device, a balance should be achieved between dispersion and nonlinear lengths. Chaotic output signals from the PANDA ring resonator are input into the add/drop filter system. Chaotic signals can be filtered by using the add/drop filter system, in which multi dark and bright solitons can be generated. In this work multi dark and bright solitons with an FWHM and an FSR of 425pm and 1.145 nm are generated, respectively, where the Gaussian pulse with a central wavelength of 1.55 μm and power of 600 mW is input into the system.
Frequency-Wavelength Trapping by Integrated Ring Resonators For Secured Netwo...University of Malaya (UM)
Optical pulse trapping via a series of microring resonator (MRR) is presented. Large bandwidth of optical soliton is generated by input pulse propagating within the MRRs. Distinguished discrete wavelength or frequency pulses can be generated by using localized spatial pulses via a networks communication system. Quantum codes can be generated by using a polarization control unit and a beam splitter, incorporating to the MRRs. Here frequency band of 10.7 MHz and 16 MHz and wavelengths of 206.9 nm, 1448 nm, 2169 nm and 2489 nm are localized and obtained and used for quantum codes generation applicable for secured networks communication.
In this study an interesting system in which a bright and dark soliton pulse can be stopped inside a nonlinear waveguide is presented. Here, we propose a system consisting of a series of ring resonators for optical trapping within a nonlinear waveguide. The bright and dark solitons can be controlled and slowed down within the waveguide. The FWHM for the output signals are calculated and used as an optical memory. Bright and dark soliton behaviors within a micro and nano ring resonator are also investigated and described. The required pulse is filtered and amplified, can be controlled and localized within the system. The localized bright and dark solitons are stopped by controlling the input power,which means that the photon stopping can be controlled by light in a ring resonator.
We propose a novel system of the dynamic optical tweezers generated by a dark soliton in the fiber optic loop. A dark soliton known as an optical tweezer is amplified and tuned within the microring resonator (MRR) system. The required tunable tweezers with different widthsand powers can be controlled. The analysis of dark-bright soliton conversion using a dark soliton pulse propagating within a MRR is analyzed. The control dark soliton is input into the system via the add port of the add/drop filter. The dynamic behavior of the dark-brightsoliton conversion is observed. The required stable signal is obtained via a drop and throughput ports of the add/drop filter with some suitable parameters. In application, generation of optical tweezers and transportation can be realized by using the proposed system, where the communication network is performed.
A molecular cryptography technique using optical tweezers, is proposed. The optical tweezer transports the molecules in the communication system. The optical tweezer generated by the dark soliton is in the form of a potential well. The dark soliton propagates inside nonlinear microring resonator (NMRR). Transportation of molecules is implemented when the dark soliton is used as input pulse. The input bright soliton control the output signal at the drop port of the system. Output optical tweezers can be connected to the quantum signal processing system consisting of transmitter and the receiver. The transmitter is used to generate the high capacity quantum codes within the series of MRR’s and anadd/drop filter. The receiver will detect the encoded signals known as quantum bits. The transmitter will generate the entangled photon pair which propagates via an optical communication link. Here the smallest optical tweezer with respect to the full width at half maximum FWHM is 17.6 nm in the formof potential well is obtained and transmitted through quantum signal processor via an optical link.
This research is used to control the nonlinear behavior of silicon microring resonators, MRR’s such as chaos and bifurcation. Increasing of nonlinear refractive indices, coupling coefficients and radius of the SMRR leads to descend input power and round trips wherein the bifurcation occurs. As result, bifurcation or chaos behaviors are seen at lower input power of 44 W, where the nonlinear refractive index is n2=3.2×10−20 m2/W. Smallest round trips can be seen for the R=40 µm and 0.1 respectively. Signals from the SMRR are passing through a polarizer beam splitter to generate quantum
binary codes which are used in wireless network communication.
The aim of this study is to generate nano optical tweezers to be connected to an optical quantum signal processing system in order to transmit quantum photon via an optical communication link. A system of microring resonator (MRR) known as Half-Panda is proposed to generate nano optical tweezers. Optical tweezers can be used to transport molecules in a communication link. The dark soliton propagates inside nonlinear MRR. Transportation of molecules or photons is implemented when the dark soliton is used as input pulse. The input Gaussian soliton is used to control the output signal at the through and drop ports of the system. Output nano optical tweezers can be connected to the quantum signal processing system consisting of a receiver and transmitter. The receiver will detect the signals of optical tweezers and transmit them via wired/wireless as quantum bits. The transmitter will generate the entangled photon pair which propagates via an optical communication link. Here the smallest nano optical tweezers signals with width at half maximum (FWHM) of 4.2 nm is obtained where the free spectrum range (FSR) of 50 nm is simulated.
Ultra-short Multi Soliton Generation for Application in Long Distance Commun...University of Malaya (UM)
Generation of picometer optical soliton pulses is investigated using a nonlinear PANDA ring resonator system connecting to an add/drop filter system. The objectives of the research are to employ systems of microring resonator (MRR) to generate binary signals to be carried out along fiber optic communication. Effective parameters such as refractive indices of a silicon waveguide, coupling coefficients (), coupling loss, radius of the ring (R) and the input power can be selected properly to operate the nonlinear behavior. The input Gaussian laser pulses with power of 600 mW are inserted into the system. The central wavelength of the input power has been selected to λ0=1.55 µm where the nonlinear refractive index of the medium is n2=2.6×10−17 m2 W−1. Therefore binary signals generated by the add/drop filter system can be converted to secure codes where the decoding process of the transmitted codes can be obtained at the final step. Here, multi soliton pulses with full width at half maximum (FWHM) of 325 could be generated, converted to secure codes and finally detected over 70 km optical fiber communication link.
Single Soliton Bandwidth Generation and Manipulation by Microring ResonatorUniversity of Malaya (UM)
In this paper, we propose a system for chaotic signal generation using a microring resonator (MRR) fiber optic system. This system uses a regular laserdiode as input power and can be incorporated with an optical add/drop filter system. When light from the laser diode feedbacks to the fiber ring resonator, the actual chaotic signal is produced by using the appropriate fiber ring resonator parameters and also the laser diode input power. The filtering process of the chaotic signals occurs during the round-trip of the pulse within the ring resonators. The single soliton pulses generation and bandwidth manipulation of the pulse can be performed using the add/drop system. Results obtained have established particular possibilities from the application. The obtained results show the effects of coupling coefficients on the bandwidth of the single soliton pulse, where the chaotic behaviors of the input pulses are presented.
NEW SYSTEM OF CHAOTIC SIGNAL GENERATION BASED ON COUPLING COEFFICIENTS APPLI...University of Malaya (UM)
The nonlinear behavior (chaotic) of light traveling in an optical fiber ring resonator such as an add/drop system
is presented. The chaotic behavior is considered to be a beneficial effect that can be used in the communication
system. Such a system can be used to secure the information signals, therefore, the ability of chaotic carriers to synchronize in a communication system is performed. The used optical material is InGaAsP/InP regarding to suitable parameters of the system. The nonlinear refractive index is fixed to n2 = 3.8 × 10−20 m2
/W, and the 20,000 iterations of round-trip within the system is simulated. The input powers are selected at 1 W, where the coupling coefficient of the system varies according to two critical cases, where 0 0.1
and 0.1 1. As a results, larger coupler coefficient corresponds to lower input power for the case of
0 0.1 and smaller coupling coefficient of the system is corresponds to lower input power when
0.1 1. To optimize the microring systems, Lower input power is recommended in many applications in optical optical communication systems.
Chaotic soliton can be generated using a nonlinear PANDA system. The research uses microring resonator
(MRR) to generate and trap chaotic signals along fiber optic communication. The parameters such as refractive
indices of a silicon waveguide, coupling coefficients ( ), coupling loss, radius of the ring (R) and the input power can be selected properly to operate the nonlinear behavior. The input Gaussian laser pulses with power of 0.45 W are inserted into the system. The central wavelength of the input power has been selected to λ0=1.55 µm where the nonlinear refractive index of the medium is n2=1.3×10−17 m2 W−1
. The generated chaotic signals with Full at Half
Maximum of 24 pm can be transmitted along the fiber optic with length of 195 km. The trapping of chaotic signals can be obtained at the end of the transmission link. Here signals with 600 fm bandwidth could be trapped within the system.
Nonlinear behaviors of light such as chaos can be observed during propagation of a Gaussian laser beam inside a single ring resonator system. Chaotic signals can be employed to generate data of logic codes to be transmitted along the fiber optic communication. Controlling of the chaotic signals can be implemented by the parameter of the system such as coupling coefficient, the ring’s radius, coupling loss and input power. The central wavelength of the input Gaussian laser pulse has been selected to λ0=1550 nm where the nonlinear refractive index of the medium is n2=1.4×10−13 m2 W−1. Therefore the data of logic codes generated by the single ring resonator system can be converted to transmitting secured codes where the decoding process of the transmitted codes can be obtained at the end of the transmission link. Here generation of logic code of “101010101011010101011101011110101101010101010110101” is performed, encoded and decoded over 50 km fiber optics. Thus secured transmitting of signals can be obtained along the long distance fiber
communication.
Generation of Nanometer Optical Tweezers Used for Optical Communication Netw...University of Malaya (UM)
A system of Half-Panda microring resonator (MRR) is proposed to generate ultra-short nanometer (nm)
optical tweezers. The dark soliton propagates inside nonlinear MRR. Molecules or photons transport within the system when the dark soliton is used as input pulse. Nano optical tweezers can be generated and used to many applications in optical communication networks. Here the smallest nano optical tweezers signals with full width at half maximum (FWHM) of 9 nm is obtained where the free spectrum range (FSR) of 50 nm is simulated.
Quantum Transmission of Optical Tweezers Via Fiber Optic Using Half-Panda Sys...University of Malaya (UM)
: The aim of this study is to generate nano optical tweezers to be connected to an optical transmission link in order to transmit tweezers via an optical fiber. A system of microring resonator (MRR) known as Half-Panda is proposed to generate nano optical tweezers. Optical tweezers can be used to transport molecules in a communication link. The dark soliton propagates inside nonlinear MRR. The input bright soliton is used to control the output signal at the through and drop ports of the system. Throughput nano optical tweezers can be connected to the fiber optic with a length of 100 km, where transmission of tweezers can be performed. The optical receiver will detect the signals of optical tweezers. A transmitter system can be used to transmit the tweezers via wired/wireless link to the users in a short communication link. Here the nano optical tweezers signals with width at half maximum (FWHM) of 33 nm are obtained and transmitted, where the free spectrum range (FSR) of the pulses is 50 nm.
Nonlinear Chaotic Signals Generation and Transmission within an Optical Fiber...University of Malaya (UM)
The nonlinear behavior of light such as chaos traveling in an optical fiber ring resonator as a single
ring resonator is presented. This phenomenon can be used to generate secret codes or arbitrary digital codes of "0" and "1" applicable in the communication system such as time division multiple access (TDMA) system. Such a system can be used to secure the information signals therefore, the ability of chaotic carriers to synchronize in a communication system is performed. The used optical material is InGaAsP/InP regarding to suitable parameters of the system. The nonlinear refractive index is fixed to n2=3.8 × 10−20 m2
/W. The input power is selected at 1 W, where the coupling coefficient of the system varies as
0 0.1. As a result, train of logic
codes could be generated and transmitted via a fiber communication link using the chaotic signals. To optimize the microring systems, Lower input power is recommended in many applications in optical optical
communication systems.
IEEE 802.15.3c WPAN Standard Using Millimeter Optical Soliton Pulse Generated...University of Malaya (UM)
A system of microring resonators (MRRs) connected to an optical modified add/drop filter system known as a Panda ring resonator is presented. The optical soliton pulse of 60 GHz frequency band can be generated and used for Wireless Personal Area Network (WPAN) applications such as IEEE 802.15.3c. The system uses chaotic signals generated by a Gaussian laser pulse propagating within a nonlinear MRRs system. The chaotic signals can be generated via a series of microring resonators, where the filtering process is performed via the Panda ring resonator system wherein ultrashort single and multiple optical soliton pulses of 60 GHz are generated and seen at the through and drop ports, respectively. The IEEE 802.15.3c standard operates at the 60 GHz frequency band, and it is applicable for a short distance optical communication such as indoor systems, where the higher transmission data rate can be performed using a high frequency band of the output optical soliton pulses. The single and multi-soliton pulses could be generated and converted to logic codes, where the bandwidths of these pulses are 5 and 20 MHz, respectively. Thus, these types of signals can be used in optical indoor systems and transmission link using appropriate components such as transmitter, fiber optics, amplifier, and receiver.