scholarly journals SURVIVABILITY IN METRO RING NETWORK USING OXADM

2017 ◽  
Vol 24 (4) ◽  
pp. 427-435
Author(s):  
Mohammad Syuhaimi Ab-Rahman ◽  
Sahbudin Shaari
Keyword(s):  
Optical Network ◽  
Data Communication ◽  
Prototype System ◽  
Ring Configuration ◽  
Optical Layer ◽  
Optical Domain ◽  
Ring Protection ◽  
Capacity Flexibility ◽  
Efficiency And Reliability ◽  
Conventional Device

The optical cross add and drop multiplexing (OXADM) node described in this paper increases the capacity, flexibility and reliability of the trunk-line optical network used for data communication. It features two different bandwidths which operate in working and protection line in a ring configuration. The OXADM has the same features of the conventional OADM node but with more efficiency and reliability. The OXADM prototype system focuses on providing survivability through restoration against failures, such as cable/fiber cut in optical layer with ring topology. Two types of restoration scheme have been proposed to ensure data flow continuously by means of linear/ multiplex protection and ring protection. Comparison between OXADM and OADM restoration schemes is also described. The BER characteristics were measured at 2.5 Gbps (OC-48) and small degradation was observed, as confirmed by a comparison of these simulation results with those obtained from systems without restoration element. Restoration schemes in OXADM node are more reliable and efficient compare to conventional device due to internally routing mechanisms and no ‘drop and re-add function’ is needed to route the signal to alternative path or processed the signals in both electronic and optical domain as practice in conventional nodes today.   

scholarly journals Emulating Software-Defined Disaggregated Optical Networks in a Containerized Framework

2021 ◽  
Vol 11 (5) ◽  
pp. 2081
Author(s):  
Francisco-Javier Moreno-Muro ◽  
Miquel Garrich ◽  
Ignacio Iglesias-Castreño ◽  
Safaa Zahir ◽  
Pablo Pavón-Mariño
Keyword(s):  
Optical Networks ◽  
Transport Infrastructure ◽  
Optical Systems ◽  
Traffic Demand ◽  
Novel Approach ◽  
Infrastructure Project ◽  
Optical Layer ◽  
Optical Domain ◽  
Control And Management ◽  
Remote Communications

Telecom operators’ infrastructure is undergoing high pressure to keep the pace with the traffic demand generated by the societal need of remote communications, bandwidth-hungry applications, and the fulfilment of 5G requirements. Software-defined networking (SDN) entered in scene decoupling the data-plane forwarding actions from the control-plane decisions, hence boosting network programmability and innovation. Optical networks are also capitalizing on SDN benefits jointly with a disaggregation trend that holds the promise of overcoming traditional vendor-locked island limitations. In this work, we present our framework for disaggregated optical networks that leverages on SDN and container-based management for a realistic emulation of deployment scenarios. Our proposal relies on Kubernetes for the containers’ control and management, while employing the NETCONF protocol for the interaction with the light-weight software entities, i.e., agents, which govern the emulated optical devices. Remarkably, our agents’ structure relies on components that offer high versatility for accommodating the wide variety of components and systems in the optical domain. We showcase our proposal with the emulation of an 18-node European topology employing Cassini-compliant optical models, i.e., a state-of-the-art optical transponder proposed in the Telecom Infrastructure Project. The combination of our versatile framework based on containerized entities, the automatic creation of agents and the optical-layer characteristics represents a novel approach suitable for operationally complex carrier-grade transport infrastructure with SDN-based disaggregated optical systems.

OXADM dalam Sistem Keselamatan Rangkaian Cincin Metropolitan

2012 ◽  
Author(s):  
Mohammad Syuhaimi Ab–Rahman ◽  
Seri Mastura Mustaza ◽  
Mohd Saiful Dzulkefly Zan ◽  
Aida Baharudin
Keyword(s):  
Optical Network ◽  
Ring Network ◽  
Protection Scheme ◽  
Safe Area ◽  
Pass Through ◽  
Ring Protection ◽  
Ring Architecture ◽  
Cross Connect ◽  
Optical Ring ◽  
Add And Drop Multiplexer

Pemultipleks Tambah Gugur Silang Optik (OXADM) merupakan satu peranti optik hibrid baru yang dihasilkan melalui gabungan dua peranti asal, iaitu Pemultipleks Tambah Gugur Optik (OADM) dan Sambung Silang Optik (OXC). Ianya telah dibangunkan berdasarkan kajian terhadap kelemahan peranti sedia ada dengan beberapa ciri baru dan menarik telah dimasukkan. OXADM diperkenalkan untuk meningkatkan tahap keselamatan dalam rangkaian cincin. Dengan adanya ciri ‘Pengumpulan’ membolehkan perlindungan multipleks diaktifkan di mana kesemua isyarat yang melalui nod optik akan dikumpulkan di atas satu talian perlindungan/persediaan sekiranya berlaku kerosakan pada talian bekerja dalam rangkaian optik cincin. Antara skema perlindungan lain yang diperkenalkan oleh OXADM ini adalah perlindungan linear dan perlindungan cincin. OXADM membenarkan isyarat membuat pusingan secara ‘U’ secara dalaman untuk mengkuarantinkan kawasan kerosakan daripada kawasan yang selamat. Kedua–dua ciri inilah yang membezakan OXADM dengan peranti–peranti sebelumnya. Dengan adanya peranti OXADM ini membolehkan sebarang kerosakan yang berlaku dalam rangkaian optik dapat dipulihkan segera dengan mengaktifkan skema perlindungan yang sesuai berdasarkan jenis dan lokasi kerosakan yang berlaku. OXADM ini merupakan peranti pertama yang mengintegrasikan ketiga–tiga jenis mekanisme keselamatan rangkaian di dalam satu peranti. Kata kunci: OXADM; skema keselamatan; rangkaian cincin; simulasi, perkakasan The Optical Cross Add & Drop Multiplexer (OXADM) is a new hybrid optical device which has the combination of the original Optical Add And Drop Multiplexer (OADM) and Optical Cross Connect (OXC) devices. OXADM is developed based on the study on the demerits of the existing devices and new features are added to the device. OXADM is introduced to increase the survivability in ring architecture network. With its ‘Accumulation’ feature enable the multiplexing protection scheme can be activated where all the signals pass through an optical node are multiplexed onto a single path as a protection/preparation in case breakdown happens at the working line in an optical ring network. Other protection schemes provided by OXADM are the Linear Protection and Ring Protection. OXADM enable the signal to route internally as U turn to segment the breakdown area from the safe area. Both features have differentiated the OXADM with the previous existing device. With this new OXADM device, any breakdown happens in an optical network can be quickly fixed by activating the appropriate protection scheme based on the type and the location of the breakdown. OXADM device is known as the first device that integrates all three network safety mechanisms onto a single device. Key words: OXADM; protection scheme; ring network; simulation; hardware

Collaborative demonstration of optical‐layer service‐differentiation and load‐balancing in intelligent optical network

2014 ◽  
Vol 50 (9) ◽  
pp. 685-686 ◽  
Author(s):  
Junhu Guo ◽  
Chongfeng Xu ◽  
Hui Li ◽  
Yuefeng Ji ◽  
Yongli Zhao ◽  
...  
Keyword(s):  
Load Balancing ◽  
Optical Network ◽  
Service Differentiation ◽  
Optical Layer ◽  
Intelligent Optical Network

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.

Research on the Capability of Survivability in Optical Network

2011 ◽  
Vol 204-210 ◽  
pp. 2176-2179
Author(s):  
Ning Zhang
Keyword(s):  
Optical Network ◽  
Data Communication ◽  
Wdm Networks ◽  
Light Path ◽  
Core Network ◽  
Link Failures ◽  
The Core ◽  
Single Link ◽  
Static Mechanism ◽  
Set Up

Survivability is the capability of a network to maintain service continuity in the presence of faults within the network. In this paper, we presented the new survivability method and discussed the capability of survivability in optical network. The survivability in WDM networks is implemented using protectionand restorationtechniques. Protection is a static mechanism to protect against failure, where the resource for both the primary and the backup light-paths are reserved prior to the data communication. Restoration on the other hand, is a dynamic mechanism where the backup light-path is not set up until the failure occurs. Survivability using these techniques is usually provided to handle single link failures in the core network.

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