An integrated survey in Optical Networks: Concepts, Components and Problems Delivered by Erna Sri Sugesti, Ir., MSc. 1 May 2013 Ali Norouzi †, A.Halim.

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Presentation transcript:

An integrated survey in Optical Networks: Concepts, Components and Problems Delivered by Erna Sri Sugesti, Ir., MSc. 1 May 2013 Ali Norouzi †, A.Halim Zaim ††, Berk Burak Ustundag, IJCSNS International Journal of Computer Science and Network Security, VOL.11 No.1, January 2011

1. INTRODUCTION

Point-to-point link apparatus: Overview O E O E TxRx Optical Sources: LED LASER Optical Detector: p-i-n photodiode Avalanche photodiode (APD) Optical fiber Transmission medium Types: Single Mode Step Index Multimode Graded Index Multimode Characteristics: Attenuation Dispersion Characteristics: Responsitivity Quantum Efficiency Sensivity Characteristics: Optical output power Wavelength Linewidth splices connectors

Optical fiber system advantages: Wider bandwidth Low transmission loss Dielectric waveguide Small size and weight

Main parts of optical fiber networks: 1.Optical technologies 2.Components that provide routing and grooming 3.Restoration at wavelength level as well as wavelength-based services

2. MATERIAL AND METHODS

2. 1 Optical network properties 3 properties for next generation access networks: 1.Point-to-point topologies 2.Passive optical networks 3.Optical wireless technologies Fig. 2 Structure of a point-to-point WDM transmission system. Fig. 1 Different technologies for fiber-to-the- home (FTTH).

Cont’: Optical wireless technology Optical networks development goal: to move toward dynamic all-optical networks O E O E TxRx Free space medium

2.2 Optical network components Transmitter: DFB, DBR Multiplexer and Demultiplexer Fiber Properties: SM Optical Amplifiers: SOA, EDFA, EDWA Optical Switches: WRS Receivers: p-i-n, APD

Fig. 9 Structure of a MEMS wavelength routing switch. Micromirrors are used to guide input beam to different outputs. Fig. 8 The general structure of an optical switch

TDM WDM, CWDM, DWDM 2.3 Multiplexing techniques

2.4 Optical WDM Networks Network with optical fiber transmission links and architecture designed to exploit the unique features of fibers and WDM

2.5 Problems of Designing Wavelength Routing General problems: Fiber (network) topology Traffic requirements (traffic matrix)

2.6 Network design and fiber topology problems Light Topology Design (LTD) Routing and Wavelength Assignment (RWA) Wavelength continuity constraint Distinct wavelength constraint

2.7 Grooming the higher-layer traffic SDH (synchronous digital hierarchy) SONET (synchronous optical network)

3. RESULTS & DISCUSSION

3.1 RWA Problems in Optical Networks Finding a path and a free wavelength for a source destination pair

3.2 Classifying RWA based on Routing 1.Static routing algorithms 2.Adaptive routing algorithms 3.Dynamic routing algorithms

3.2.1 Static routing algorithms Fixed Path Routing Fixed Alternate Routing

3.2.2 Adaptive routing algorithms Adaptive Routing Traditional Adaptive RWA Physically Aware Adaptive RWA

3.2.3 Dynamic routing algorithms Connection requests are initiated randomly. Steps: Compute a number of candidate physical paths for each source-destination edge node pair and arrange the min a path list. Order all wavelengths in a wavelength list. Starting with the path and wavelength at the top of the corresponding list, search for a feasible path and wavelength for the requested lightpath.

3.3 Classifying RWA based on Propagation Centralized architecture Distributed architecture Centralized architecture Distributed architecture

3.4 Wavelength Assignment (WA) Problem Constraints: Distinct Channel Assignment (DCA) Wavelength Continuity WA-algorithm: Random-fit First-fit Most-used

3.5 Physical Impairment Linear effects Nonlinear effects

3.6 Linear Impairment Fiber attenuation Components insertion loss Amplifier spontaneous emission (ASE) Chromatic dispersion (CD) or group velocity dispersion (GVD) Polarization dispersion mode (PMD) Polarization dependent losses (PDL) Crosstalk (XT) (both inter- and intra-channel) Filter concatenation (FC)

Self Phase Modulation (SPM) Cross Phase Modulation (XPM) Four-wave Mixing (FWM) Stimulated Brillouin Scattering (SBS) Stimulated Raman Scattering (SRS)

3.8 Future works