scholarly journals Performance Comparison of Dynamic Elastic Optical Networks with Optical Regeneration

2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Lê Hải Châu ◽  
Đặng Hoài Bắc
Keyword(s):  
Optical Networks ◽  
Network Performance ◽  
Performance Enhancement ◽  
Blocking Probability ◽  
Performance Comparison ◽  
Optical Signals ◽  
Optical Regeneration ◽  
Regeneration Capability ◽  
Optical Paths ◽  
The Impact

We have investigated optical regeneration issues and application in elastic optical networks that are capable of providing dynamically optical paths with flexible bandwidths. We have analyzed the impact of optical regeneration in elastic optical networks and clarified various usage scenarios. We have then evaluated and compared the performance, in terms of the overall blocking probability and the total accommodated traffic volume, of three possible network scenarios with regeneration capability including (i) no regeneration, (ii) 3R regeneration, and (iii) 4R regeneration for practical network topologies. Numerical simulation proved that deployment of optical regeneration devices can exploit elastic optical networking to enhance the network performance for provisioning dynamically bandwidth-flexible lightpath services. It is also demonstrated that using re-modulation function while regenerating optical signals (4R regeneration) can further improve the network performance. However, due to the high cost of optical regeneration devices, especially all-optical ones, and more functional regenerators, the trade-off between the performance enhancement and the necessary number of regenerating devices needs to be carefully considered.

scholarly journals Optimization of Optical Networks Based on CDC-ROADM Technology

2019 ◽  
Vol 9 (3) ◽  
pp. 399 ◽  
Author(s):  
Stanisław Kozdrowski ◽  
Mateusz Żotkiewicz ◽  
Sławomir Sujecki
Keyword(s):  
Optical Networks ◽  
Network Performance ◽  
Optical Network ◽  
Network Services ◽  
Traffic Demand ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
Different Dimensions ◽  
New Generation ◽  
The Impact

New generation of optical nodes in dense wavelength division multiplexed networks enables operators to improve service flexibility and make significant savings, both in operational and capital expenditures. Thus the main objective of the study is to minimize optical node resources, such as transponders, multiplexers and wavelength selective switches, needed to provide and maintain high quality dense wavelength division multiplexed network services using new generation of optical nodes. A model based on integer programming is proposed, which includes a detailed description of an optical network node. The impact on the network performance of conventional reconfigurable optical add drop multiplexer technology is compared with colorless, directionless and contentionless approaches. The main focus of the presented study is the analysis of the network congestion problem arising in the context of both reconfigurable optical add drop multiplexer technologies. The analysis is supported by results of numerical experiments carried out for realistic networks of different dimensions and traffic demand sets.

scholarly journals Statistical Assessment of Open Optical Networks

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 64 ◽  
Author(s):  
Emanuele Virgillito ◽  
Alessio Ferrari ◽  
Andrea D’Amico ◽  
Vittorio Curri
Keyword(s):  
Optical Networks ◽  
Network Performance ◽  
Blocking Probability ◽  
Optical Network ◽  
Network Capacity ◽  
Physical Layer ◽  
Point Of View ◽  
Assessment Process ◽  
Physical Parameters ◽  
High Level

In order to cope with the increase of the final user traffic, operators and vendors are pushing towards physical layer aware networking as a way to maximize the network capacity. To this aim, optical networks are becoming more and more open by exposing physical parameters enabling fast and reliable estimation of the lightpath quality of transmission. This comes in handy not only from the point of view of the planning and managing of the optical paths but also on a more general picture of the whole optical network performance. In this work, the Statistical Network Assessment Process (SNAP) is presented. SNAP is an algorithm allowing for estimating different network metrics such as blocking probability or link saturation, by generating traffic requests on a graph abstraction of the physical layer. Being aware of the physical layer parameters and transceiver technologies enables assessing their impact on high level network figures of merit. Together with a detailed description of the algorithm, we present a comprehensive review of several results on the networking impact of multirate transceivers, flex-grid spectral allocation as a means to finely exploit lightpath capacity and of different Space Division Multiplexing (SDM) solutions.

scholarly journals Physical Encoding in Optical Layer Security

2012 ◽  
Author(s):  
Zhenxing Wang ◽  
Mable P. Fok ◽  
Paul R. Prucnal
Keyword(s):  
Optical Networks ◽  
Data Security ◽  
Optical Transmission ◽  
Optical Network ◽  
Network Capacity ◽  
Research Attention ◽  
Optical Signals ◽  
Considerable Research ◽  
Optical Layer ◽  
The Impact

Data security at the physical layer of optical networks, or optical layer security, has received considerable research attention due to the rapid growth of optical network capacity [1]. Among various optical layer approaches, optical codedivision multiple access (OCDMA) systems are considered to be promising because of the physical encoding and decoding processes comprising these systems. Generally, physical encoding is an important concept in the field of optical layer security, which implements encoding to the transmitted optical signals, and protects the transmitted data from attack. In this paper, we provide an overview of various OCDMA systems, and discuss the impact of different physical encoding methods on OCDMA systems, in terms of security assurance. Furthermore, we introduce the application of physical encoding to optical steganography and optical transmission with wireless CDMA for security improvement.

A Novel Survivability Technique: DHMBC for WDM Optical Networks

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Himanshi Saini ◽  
Amit Kumar Garg
Keyword(s):  
Optical Networks ◽  
High Speed ◽  
Network Performance ◽  
Blocking Probability ◽  
Destination Node ◽  
Wdm Optical Networks ◽  
Network Resource ◽  
High Speed Networks ◽  
Network Protection ◽  
Huge Data

AbstractFailures and malicious attacks in high-speed optical networks lead to huge data as well as revenue loss. In this paper, a survivability technique called Dynamic and Hybrid with Multiple Backup selection Criteria technique for high-speed networks has been proposed with the objective to minimize network resource utilization, blocking probability, End-to-End delay and maximize throughput. The proposed model decides the type of backup provisioning technique based on the location of failure in the network. Protection has been provisioned to selective links near to destination node and other links are restored. The simulation results indicate that proposed survivability technique is efficient as compared to conventional techniques in terms of various network performance measuring parameters. This technique inherits merits of protection as well as restoration. It can be practically implemented to provide resilience in future high-speed networks.

Energy-Efficient Routing and Spectrum Assignment Algorithm with Physical-Layer Impairments Constraint in Flexible Optical Networks

2017 ◽  
Vol 38 (4) ◽  
Author(s):  
Jijun Zhao ◽  
Nawa Zhang ◽  
Danping Ren ◽  
Jinhua Hu
Keyword(s):  
Energy Efficiency ◽  
Optical Networks ◽  
Energy Efficient ◽  
Blocking Probability ◽  
Physical Layer ◽  
Energy Efficient Routing ◽  
Spectrum Assignment ◽  
Physical Layer Impairments ◽  
Routing And Spectrum Assignment ◽  
The Impact

AbstractThe recently proposed flexible optical network can provide more efficient accommodation of multiple data rates than the current wavelength-routed optical networks. Meanwhile, the energy efficiency has also been a hot topic because of the serious energy consumption problem. In this paper, the energy efficiency problem of flexible optical networks with physical-layer impairments constraint is studied. We propose a combined impairment-aware and energy-efficient routing and spectrum assignment (RSA) algorithm based on the link availability, in which the impact of power consumption minimization on signal quality is considered. By applying the proposed algorithm, the connection requests are established on a subset of network topology, reducing the number of transitions from sleep to active state. The simulation results demonstrate that our proposed algorithm can improve the energy efficiency and spectrum resources utilization with the acceptable blocking probability and average delay.

scholarly journals Predeployment of Transponders for Dynamic Lightpath Provisioning in Translucent Spectrally–Spatially Flexible Optical Networks

2020 ◽  
Vol 10 (8) ◽  
pp. 2802
Author(s):  
Krzysztof Walkowiak ◽  
Mirosław Klinkowski ◽  
Adam Włodarczyk ◽  
Andrzej Kasprzak
Keyword(s):  
Optical Networks ◽  
Data Analytics ◽  
Network Performance ◽  
Routing Algorithm ◽  
Dynamic Routing ◽  
Numerical Results ◽  
Network Operator ◽  
Optical Signals ◽  
Signal Regeneration ◽  
Traffic Characteristics

We consider a dynamic lightpath provisioning problem in translucent spectrally–spatially flexible optical networks (SS-FONs) in which flexible signal regeneration is achieved with transponders operating in back-to-back (B2B) configurations. In the analyzed scenario, an important aspect that has a significant impact on the network performance is the decision on placement of transponders that can be used for two purposes: transmitting/receiving (add/drop) of optical signals at the source/destination nodes and regeneration of the signals at some intermediate nodes. We propose a new algorithm called scaled average used regenerators (SAUR). The key idea of the SAUR method is based on a data analytics approach, i.e., the algorithm exploits information on network traffic characteristics and the applied dynamic routing algorithm to obtain additional knowledge for the decision on transponder placement. The numerical results obtained for two representative topologies highlight that the proposed SAUR method outperforms reference algorithms in terms of the amount of traffic that can be accepted in the network. In other words, placement of transponders yielded by the SAUR method allows to increase the SS-FON throughput using only the existing resources, i.e., the network operator does not have to invest in new devices or fibers.

Design and Analysis of Stimulated Raman Scattering-Aware Algorithm in RWA

2017 ◽  
Vol 38 (2) ◽  
Author(s):  
Wai S. Sim ◽  
Saw C. Tan ◽  
Zulfadzli Yusoff
Keyword(s):  
Raman Scattering ◽  
Optical Networks ◽  
National Science Foundation ◽  
Network Performance ◽  
Stimulated Raman Scattering ◽  
Blocking Probability ◽  
Wavelength Assignment ◽  
Ultimate Objective ◽  
Necessary And Sufficient ◽  
Stimulated Raman

AbstractA stimulated Raman scattering (SRS)-aware routing and wavelength assignment (RWA) scheme, called assign minimum interference and shortest algorithm, is proposed to minimize the effect of SRS in network. The design parameter, the number of interference of routes in the proposed algorithm is investigated to analyze its capabilities of influence the network performance. The various setting of the parameter is tested in 15-nodes Mesh and 14-nodes National Science Foundation networks for analysis in order to provide useful guidelines for designing effective SRS-aware RWA scheme. The ultimate objective is to define the necessary and sufficient rules that must be followed in the proposed algorithm by identifying the necessary RWA parameters in order to minimize the effect of SRS in optical networks. The result shows that the smaller the number of interference of routes, the lower the blocking probability in the mentioned topologies.

scholarly journals Wavelength Converter Based Optimized RWA for All Optical Networks

2019 ◽  
Vol 8 (2) ◽  
pp. 111-115
Author(s):  
Shilpa S. Patil ◽  
Bharat S. Chaudhari
Keyword(s):  
Optical Networks ◽  
Network Performance ◽  
Blocking Probability ◽  
Wavelength Assignment ◽  
Wdm Networks ◽  
Optimal Placement ◽  
Wavelength Converters ◽  
Wavelength Converter ◽  
Call Blocking ◽  
Call Blocking Probability

Wavelength converters are used in WDM networks to avoid call blocking and minimizing the blocking probability. Optimal placement of wavelength converters restricts the call blocking probability, the complexity and improves the overall network performance of the network. In this paper, we propose a new weight dependent routing and wavelength assignment algorithm for the optimal placement of the wavelength converters. The wavelength converter placement was considered separately at all the nodes and the partial nodes. Our algorithm outperforms the previously reported studies and requires a lesser number of wavelength converters to achieve the required performance. It reduces the blocking probabilities up to 5.4% and shows that the first four nodes primarily control the blocking performance of the network. The study also reveals that instead of merely increasing the number of converters, their placement at the right location plays a crucial role in improving the performance. Initially, although an increase in the number of the wavelengths also improves the network performance, the further increase does not contribute much to the reduction of the blocking probability.

scholarly journals Placement of Wavelength Converters in Dynamically Routed All Optical Networks in presence of Tunable Transceivers

2016 ◽  
Vol 7 (4) ◽  
pp. 26
Author(s):  
Shilpa S Patil ◽  
Bharat S Chaudhari
Keyword(s):  
Performance Analysis ◽  
Optical Networks ◽  
Network Performance ◽  
Blocking Probability ◽  
Wavelength Converters ◽  
Wavelength Converter ◽  
Challenging Tasks ◽  
All Optical ◽  
Continuity Constraint ◽  
The Cost

Efficient routing with optimal resources is one of the challenging tasks in the design of DWDM networks. Wavelength Converter (WC) is an important resource, as the placement of WCs affects the network performance and the quantity of WCs affects the cost of the network. With the help of WCs the network performance can be maximized by removing the wavelength continuity constraint. As WCs are very expensive, selecting the candidate nodes for the placement of WCs in a network is important. In this paper we have proposed an optimized approach for the placement of WCs in the presence of tunable transceivers (TTRs) and fixed transceivers (FTRs). The performance analysis has been carried out for above approaches. Observation shows that sparse partial wavelength converters with various loads requires only 2.4% converters. When tunable transceivers are used an average reduction of 73% in blocking probability and average saving of 91% in required number of converters. 

Fallacious Node Algorithm for Performance Enhancement in Optical-Burst-Switching Networks

2019 ◽  
Vol 40 (3) ◽  
pp. 239-245
Author(s):  
Hardeep Singh Saini ◽  
Amit Wason
Keyword(s):  
Optical Networks ◽  
Performance Enhancement ◽  
Blocking Probability ◽  
Optical Network ◽  
Optical Burst Switching ◽  
Observational Analysis ◽  
Burst Switching ◽  
Optical Burst Switching Networks ◽  
Key Features ◽  
Optical Burst

Abstract In this paper, fallacious node algorithm is formulated for performance enhancement of an optical-burst-switching (OBS) network. With the procedural and observational analysis, we have demonstrated that the blocking probability is extremely unnoticeable, during a call establishment, while collectively discarding the faulty nodes from the selected paths. There may be distinguishing values of blocking probability because of random value of congestion on each path. The blocking probability is restrained so as not to be more than 10 % on several values on traffic and congestion. The blocking probability diminishes and becomes imperceptible with the incorporation of fallacious node algorithm and subsequently the performance of optical network is highly aggrandized. Thus the fallacious node algorithm manifests incredible prospects for optical networks as the key features such as the accessibility; sustainability and reliability of the network are highly appreciated and upgraded.

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