Impulsive Noise Mitigation in Integrated System of Visible Free Space Optic and Broadband Powerline Communication

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A noisyless integrated system of visible free space optic (VFSO) and broadband powerline communication (BPLC) that uses already installed powerline cables and white LEDs as a communication channel for indoor computer network infrastructure is proposed.This system has the advantage of low cost and easy implementation for data transmission. The impulsive noise exist on powerline disturbs the system performance considerably, so in order to address such a problem a signal clipping scheme has been proposed.The performance of proposed system is evaluated and compared in terms of bit error rate (BER) with the existing system. Results confirmed that the proposed system has better performance than existing one.

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Impulsive Noise Mitigation in Integrated System of Visible Free Space Optic and
Broadband Powerline Communication
S. E. Alavi*1
, I. S. Amiri2
, A. S. M. Supa’at1
, S. M. Idrus1
, M.Ridwanto1
1
Lightwave Communication Research Group, Faculty of Electrical Engineering, Universiti Teknologi
Malaysia, 81310 UTM Skudai, Johor, Malaysia
2
Photonics Research Centre, University of Malaya ,50603 Kuala Lumpur, Malaysia,
*E-mail: isafiz@yahoo.com
* Email Address: ehsan.alavi@fkegraduate.utm.my
Keywords: Broadband Powerline Communication (BPLC), Visible Free Space Optic (VFSO),
White LED, Indoor networking, Impulsive Noise Reduction
Abstract. A noisyless integrated system of visible free space optic (VFSO) and broadband powerline
communication (BPLC) that uses already installed powerline cables and white LEDs as a
communication channel for indoor computer network infrastructure is proposed.This system has the
advantage of low cost and easy implementation for data transmission. The impulsive noise exist on
powerline disturbs the system performance considerably, so in order to address such a problem a
signal clipping scheme has been proposed.The performance of proposed system is evaluated and
compared in terms of bit error rate (BER) with the existing system. Results confirmed that the
proposed system has better performance than existing one.
1. INTRODUCTION
VFSO is a kind of optical wireless communication system which utilizes the fast switching of
white LEDs (WLED) to modulate the visible-light wave for free space optic communications [1].
Apart from wireless systems for indoor applications, there is increasing interests to use ubiquitous
wired system for home networking so called power line communication (PLC). Using the powerline
as a communication medium could be a cost effective way compared to other systems because it uses
an existing cabling infrastructure.
The idea of integrating these two systems for indoor networking was pioneered by Komine
et.al [2] which was based on narrowband PLC and single carrier modulation. Our team in recent
works, have proposed new broadband (1MHz up to 30 MHz) integrated system in which by
considering all types of noises and multipath effects in the hostile PLC medium, discrete multi-tone
(DMT) modulation was selected to overcome channel impairments and blue filter was used to
increase the bandwidth of commercially available phosphor-based white LED at receiver from 2 to
~20 MHz [3]. In this work, besides using DMT modulation we have also applied clipping scheme to
overcome impulsive noise effects. Clipping is cutting off amplitude of the signal over threshold level
[4]. The main components of integrated system are shown in Fig.1. It consists of:

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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.

Dark-Bright Solitons Conversion System for Secured and Long Distance Optical ...

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.

Secured Transportation of Quantum Codes Using Integrated PANDA-Add/drop and T...

University of Malaya (UM)

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.

Determination Of Fwhm For Solition Trapping

University of Malaya (UM)

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 Study oF Dynamic Optical Tweezers Generation For Communication Networks

University of Malaya (UM)

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.

University of Malaya (UM)

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.

Controlling Nonlinear Behavior of a SMRR for Network System Engineering

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.

Long Distance Communication Using Localized Optical Soliton via Entangled Ph...

University of Malaya (UM)

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.

Optical Wired/Wireless Communication Using Soliton Optical Tweezers

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.

Ultra-short Multi Soliton Generation for Application in Long Distance Commun...

University 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.

Single Soliton Bandwidth Generation and Manipulation by Microring Resonator

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.

NEW SYSTEM OF CHAOTIC SIGNAL GENERATION BASED ON COUPLING COEFFICIENTS APPLI...

University of Malaya (UM)

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