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Design of new 4-channel FTTH Mux/Demux based on cascaded wavelength selective coupler

Journal of Optical Communications 2009年第2期30卷 80-85页

作者： Ab-Rahman, Mohammad Syuhaimi Computer and Network Security Research Group Department of Electrical Electronic and System Faculty of Engineering and Bulit Environmnet 43600 UKM Bangi Selangor Malaysia

The purpose of this paper is to design and characterize the Multiplexer/Demultiplexer (Mux/Demux) which uses the concept of coupled mode theory. The design is based on cascading the wavelength selective coupler (WSC) devices utilizing commercial specification. The device is designed on silica substrate with compliance of FTTH wavelength such as wavelengths 1310 nm (upstream data/voice), 1480 nm (downstream data/voice), 1550 nm (video) and 1625 nm (testing). The proposal of designed Mux/Demux is used as a router for specific wavelength in order to detect any optical line failure in FTTH network application in which the OTDR launched wavelength (1625 nm) is used as troubleshooting signal. The performance of the devices was modeled using the beam propagation method (BPM-Cad) product from the Optiwave Inc. The device then is characterized in term of output power, insertion loss and true loss measurement.

关键词： Silica

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The proposal of OXADM application in FTTH network

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Journal of Optical Communications 2009年第2期30卷 99-103页

作者： Ab-Rahman, Mohammad Syuhaimi Jumari, Kasmiran Computer and Network Security Research Group Department of Electrical Electronic and System Faculty of Engineering and Bulit Environmnet 43600 UKM Bangi Selangor Malaysia

With the drastically growth in optical communication technology, a lossless, low-crosstalk and multifunction optical switch is most desirable for large-scale photonic network. To realize such a switch, we have introduced the new architecture of optical switch that embedded many functions on single device. The asymmetrical architecture of OXADM consists of 3 parts;selective port, add/drop operation, and path routing. The unique features offered by OXADM has extended its application to Fiber to-the Home Technology (FTTH), here the OXADM is used as a wavelength management element in Optical Line Terminal (OLT). Each port is assigned specifically with the operating wavelengths and with the dynamic routing management to ensure no traffic combustion occurs in OLT. Protection and restoration mechanisms have been applied in backbone networks, but access networks are not considered significantly in the scope of survivability. Towards that, this paper describes our recent approach toward advanced customer access network through the development of an access control system (ACS). The ACS focuses on providing survivability through the OXADM restoration scheme against failure by means of dedicated and shared protection that is applied in FTTH-EPON. A next feature is the high speed restoration achieved by automatic re-routing using fiber status monitoring. Each OXADM has a node controller which receives reports on the status periodically from access control system (ACS). When a failure is detected, The ACS will send a command to the related OXADM to be activated. The proposed restoration system is the first in its kind which covers the survivability in the drop section of FTTH access network.

关键词： Restoration

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OSNR analysis on optical cross add and drop multiplexer (OXADM) in ring metropolitan (CWDM) network: The analytical approach

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Journal of Optical Communications 2009年第4期30卷 195-199页

作者： Ab-Rahman, Mohammad Syuhaimi Ling, Tan Sue Ee, Amy Teng Sing Zaharah, Lina Jaafar, Faridah Universiti Kebangsaan Malaysia Department of Electrical Electronic and System Engineering Computer and Network Security Research Group 43600 UKM Bangi Selangor Malaysia

The optical device model named Optical Cross Add and Drop Multiplexer (OXADM) uses the combined concepts of optical add/drop multiplexing and optical cross connect between two main transmission lines in order to implement the wavelength routing operation. The device can operate in point-to-point, ring or mesh network topology. In a ring metropolitan network, the OXADMs are located in the nodes, which provide functionalities such as transport, multiplexing, routing, supervision and survivability of client signals processed predominantly in optical domain. The objective of this paper is to analyze the OSNR for OXADM ring network with assumptions to determine the connections between each component in the network and the OSNR using Matlab. The analysis results can help in determining a better configuration of OXADM devices in a ring metropolitan network.

关键词： Drops

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The faulty optical fiber mechanism and fault localization techniques in TDM-PON network

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Journal of Optical Communications 2009年第1期30卷 37-43页

作者： Ab-Rahman, Mohammad Syuhaimi Ng, Boonchuan Jumari, Kasmiran Universiti Kebangsaan Malaysia Department of Electrical Electronics and Systems Engineering Computer and Network Security Research Croup 43600 UKM SanglSelangor Malaysia

In this paper, the mechanism of failure (breakdown) detection in an optical fiber line will be studied. The objectives of this paper are to understand in detail the mechanism of faulty fiber and previous recommended fault localization techniques for fiber-to-the-home (FTTH) access network. The detail failure analysis results, failure mechanism, and eliminating solution will be studied and presented. It was reported that any failure in FTTH is affected the triple-play services transmission. Conventionally, a fiber fault in FTTH can be located using optical time domain reflectometer (OTDR) upwardly from customer premises toward central office (CO). Technician is sent to the optical network terminal (ONT) or optical network unit (ONU) side to inject an OTDR pulse into the faulty fiber. This approach would require much time and effort. Moreover, OTDR can only display a measurement result of a line in a time. Therefore, it becomes a hindrance to detect failure of optical line with a large number of customer premises and large coverage area in the fiber plant by using an OTDR. Besides, it is difficult to detect a failure in optical line equipped with passive optical splitter by using a conventional OTDR in the CO downwardly from CO towards the customer premises, because the Rayleigh back-scattered (RBS) light from different branches overlap with each other in the OTDR trace and cannot be distinguished. To overcome these problems to achieve desired network survivability, we introduced a MATLAB-based graphical user interface (GUI) named Centralized Failure Detection System (CFDS), which is potentially used to increase efficiency and flexibility of FTTH, particularly in monitoring the optical signal flow and locating a fiber break downwardly from CO. To perform all the mentioned tasks, interfacing between the developed program with OTDR is required.

关键词： Fiber to the x

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network management software tool for FTTH-PON: SANTAD

Network management software tool for FTTH-PON: SANTAD

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IEEE Conference on Innovative Technologies in Intelligent Systems and Industrial Applications (CITISIA)

作者： Ng Boon Chuan Mohammad Syuhaimi Ab-Rahman Aswir Premadi Kasmiran Jumari Division Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Malaysia

This paper proposed a network management software tool named smart access network _ testing, analyzing and database (SANTAD) that associated with remotely controlling, optical monitoring, system analyzing, fault detection, protection switching, and automatic recovery apparatus for fiber-to-the-home passive optical network (FTTH-PON) based on Visual Basic programming. The developed program is able to prevent and detect any occurrence of fault in the network system through centralized monitoring and remote operating from central office (CO) via Ethernet connection. SANTAD enable the status of each transmission link to be displayed on a single computer screen with capability to configure the drastic drop of optical signal level and detect the failure simultaneously. The analysis results will then stored in database with certain attributes such as date and time, network failure rate, failure location, etc. The database system enable the history of network scanning process be analyzed and studied by the engineers.

关键词： Software tools Passive optical networks Optical fiber testing Optical control Optical fiber networks computerized monitoring Remote monitoring Fault detection Automatic testing Software testing

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Vanets: Case Study of a Peer-to-Peer Video Conferencing System

Vanets: Case Study of a Peer-to-Peer Video Conferencing Syst...

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Consumer Communications and networking Conference, CCNC IEEE

作者： Tareq Hossain Yi Cui Yuan Xue Vanderbilt Advanced Network Systems Laboratory Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

Peer-to-peer (P2P) is a powerful platform for a variety of multimedia streaming applications over the Internet such as video-on-demand, video conferencing, live broadcasting, etc. A P2P system is extremely cost-effective since it utilizes the resources (CPU cycles, storage space, and uplink bandwidth) of peer *** decentralized and shared bandwidth nature of a P2P network, therefore, makes it an effective choice for implementing video conferencing applications. In this work, Vanets is presented , a P2P based video conferencing system that takes advantage of transcoding to optimally allocate streaming rates for all participating peers. The solution presented in this paper distinguishes between active and passive participants and enhances the video quality of the active participant.

关键词： Peer to peer computing Videoconference Video sharing Streaming media Bandwidth High definition video Costs Displays Laboratories Digital multimedia broadcasting

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Dispatch of Mobile Resources in Wireless Sensor networks

Dispatch of Mobile Resources in Wireless Sensor Networks

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IEEE International Conference on Computational Science and engineering, CSE

作者： Tzung-Shi Chen Hua-Wen Tsai Chih-Wei Wei Department of Computer Science and Information Engineering National University of Tainan Tainan Taiwan Department of Computer Information and Network Engineering Lunghwa University of Science and Technology Taiwan Department of Information and Learning Technology National University of Tainan Tainan Taiwan

This paper discusses how to dispatch mobile resources to provide services for users in wireless sensor networks. The sensor nodes are able to dispatch these mobile resources by themselves, when they detect events and need the special services of mobile resources. This paper presents four mobile resource dispatch mechanisms according to two objective functions, where one centralized mechanism and three distributed mechanisms. From the results of simulation, the distributed dispatch mechanisms reduce the more dispatch packet flows than the centralized dispatch mechanism.

关键词： Wireless sensor networks Event detection Hardware Mechanical sensors Mobile robots Infrared sensors Sensor phenomena and characterization computer networks Mobile computing Discrete event simulation

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Distributed Load Balancing over Directed network Topologies

Distributed Load Balancing over Directed Network Topologies

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2009 American Control Conference (ACC 2009)

作者： Alejandro Gonzalez-Ruiz Yasamin Mostofi Cooperative Network Lab Department of Electrical and Computer Engineering University of New Mexico Albuquerque New Mexico 87131 USA

ISBN: (纸本)9781424445233

In this paper we consider the problem of distributed load balancing over a directed graph that is not fully connected. We study the impact of network topology on the stability and balance of distributed computing. We furthermore propose Informed Load Balancing (I-LB), an approach in which the nodes first reach an agreement over the balanced state, through using a consensus-seeking protocol, before proceeding to redistribute their tasks. We compare the performance of I-LB with that of the Original Load Balancing (O-LB) approach in terms of speed of convergence and bandwidth usage. We prove that the O-LB approach can guarantee convergence to a balanced state as long as the underlying graph is strongly connected while I-LB may not converge. However, I-LB can increase the speed of convergence and/or reduce the bandwidth usage especially for low-connectivity graphs.

关键词： Load management network topology Distributed computing Convergence Bandwidth Stability Wireless networks Downlink Protocols High performance computing

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Minimizing Rate Distortion in Peer-to-Peer Video Streaming

Minimizing Rate Distortion in Peer-to-Peer Video Streaming

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Consumer Communications and networking Conference, CCNC IEEE

作者： Tareq Hossain Yi Cui Yuan Xue Vanderbilt Advanced Network Systems Laboratory Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

This paper addresses the problem of optimal rate allocation for video stream in peer-to-peer networks. We present a distributed rate allocation algorithm with the goal of minimizing the total video distortion among peers receiving the same video. The scheme assumes that video streams can be transcoded/re- quantized at intermediate peers. We deploy a double pricing solution that simultaneously incorporates the network and the relay constraints in the peer-to-peer network and compare it with a single pricing solution where the relay constraint is applied only after all the communicating peers converge to optimality. We combine our solution with two video adaptation techniques: transcoding using times 264 and scalable coding using H.264 SVC (scalable video coding) extension. Our experiment shows that the double pricing solution consistently achieves a smaller aggregate distortion for all peers over the single pricing solution.

关键词： Rate-distortion Peer to peer computing Streaming media Relays Pricing Transcoding Aggregates Static VAr compensators Resource management Bandwidth

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Rate Distortion Optimization for Mesh-Based P2P Video Streaming

Rate Distortion Optimization for Mesh-Based P2P Video Stream...

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IEEE International Conference on Communications (ICC)

作者： T. Hossain Y. Cui Y. Xue Vanderbilt Advanced NETwork Systems Laboratory Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

This paper addresses the problem of optimal rate allocation for video streaming in a multi-path peer-to-peer mesh network. We present a distributed rate allocation algorithm that minimizes the total rate distortion among receiving peers. The scheme assumes that video streams can be transcoded/re-quantized at intermediate peers. We deploy a double pricing solution that simultaneously incorporates both the network and the relay constraints. We compare it with a single pricing solution where the relay constraint is applied only after all the communicating peers have converged. Our simulation shows that the double pricing solution consistently achieves a smaller aggregate distortion for all peers in comparison to the single pricing solution and thus achieves higher video quality.

关键词： Rate-distortion Streaming media Pricing Relays Aggregates Peer to peer computing Videoconference Internet Bandwidth Multicast algorithms

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