Online connection provisioning in metro optical WDM networks using reconfigurable OADMs

Zhu, Hongyue; Mukherjee, Biswanath

doi:10.1109/jlt.2005.856155

Cited by 44 publications

(2 citation statements)

References 10 publications

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“…Quantification of improvement in performance of optical networks, when optical add/drop multiplexers are replaced by ROADMs, is discussed in [10]. Blocking performance of optical networks with limited number of transceivers is investigated in [11] [12]. It was shown that a ROADM node with limited number of transceivers performs near to full number of widely tunable transceivers.…”

Section: Introductionmentioning

confidence: 99%

Computational Modelling of WDM-ROADM Node Implementations

Anchal,

Marom

2024

Preprint

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The value of colorless, directionless, and contentionless (CDC-)ROADM (reconfigurable optical add/drop multiplexer) nodes is strongly contested in the optical networking community. In this work, we compare known ROADM node designs incorporating different switching elements and account for their total nodal switching state support (in consideration of both channel routing and add/drop). This allows us to quantify the impact of directional/contentional accessibility constraints to add/drop transceivers. By considering the network node entity as a permutation network among its ingress/egress ports for all wavelength channels, which covers both through routing and add/drop assignments, we tabulate the node’s switching capacity, or total allowable connection states, per different ROADM architecture, hardware constraints, and finite number of add/drop transceivers. We further introduce the impact of idle wavelength channels on fiber links, as well as bidirectional routing assignments. Our switching capacity enumerations demonstrate that CDC-ROADM outperforms other designs, but parallel contentional aggregation hardware (partially contentional) and directional transceivers (permanently assigned to port directions) offer competitive performance under certain scenarios (at lower and higher number of deployed transceivers, or a combination of both). These findings suggest that design alternatives to the “difficult to implement” CDC-ROADM exist, with nearly equivalent switching capacity, and additional system considerations must be taken into account for ROADM design selection such as hardware availability, cost, impact of traffic churn, and disaster recovery with over-provisioned add/drop transceivers.

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Section: Introductionmentioning

confidence: 99%

Computational Modelling of WDM-ROADM Node Implementations

Anchal,

Marom

2024

Preprint

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“…The ROADMs were investigated and introduced mainly to core backbone networks [3] and metro networks [4] by carriers, where high quality of service (QoS) is required for heavy traffic. For the large‐scale local area networks (LANs) in business buildings, campus networks, factory networks, and regional networks connecting research organizations or offices in local governments, the WDM technologies are also expected to provide broadband services effectively so as to meet the increasing demands.…”

Section: Introductionmentioning

confidence: 99%

Wavelength‐transparent IP‐over‐CWDM network with stackable ROADMs for best effort performance

Nooruzzaman

Kawai

Thủy

et al. 2012

IEEJ Transactions Elec Engng

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Stackable reconfigurable optical add/drop multiplexers (S‐ROADMs) have been proposed for use in IP over coarse wavelength‐division multiplexing (CWDM) networks so as to provide capabilities of remote lightpath reconfiguration and manual ROADM reconfiguration under the best effort transmission specified by the service level agreement. The S‐ROADM can be constructed by connecting modules with different wavelengths required in the node. The experimental results clarify that the S‐ROADM can add/drop or pass through the wavelengths successfully, providing no limit to the passing‐through (PT) wavelengths, that is, ensuring the wavelength transparency in the network. The S‐ROADMs could remove congestions by adding a lightpath remotely within a recovery time with degraded SLA. The transmission break time was also within the recovery time when adding a module manually to the in‐service S‐ROADM to increase bandwidth to be provided to new users. As a result, the S‐ROADMs provide more flexible CWDM networks in terms of scalability and reconfigurability. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Bi‐directional lightpath reconfiguration in regional IP‐over‐WDM networks by a centralized control system

Hashimoto

Koyama

Nooruzzaman

et al. 2009

IEEJ Transactions Elec Engng

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Bi‐directional lightpath reconfiguration performance has been evaluated experimentally for regional IP‐over‐wavelength‐division multiplexing network applications, making the network scalable and stable when traffic changes occur. The reconfiguration performance was examined in an experimental network with reconfigurable optical add/drop multiplexers (ROADMs) to connect four nodes with bi‐directional dual‐fibers. The experiment was conducted by controlling the ROADMs. The control signals were sent by a developed system. The lightpaths were added or deleted by the control system in the experimental network, and IP packets were monitored. The results clarified that lightpaths could be reconfigured by controlling the ROADMs, and IP packets could be routed dynamically by Open Shortest Path First so as to adapt the lightpath changes. The reconfiguration functions of the system together with the ROADMs provide network administrators with easy management of the network in a skill‐less, centralized and remotely controlled way. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Online connection provisioning in metro optical WDM networks using reconfigurable OADMs

Cited by 44 publications

References 10 publications

Computational Modelling of WDM-ROADM Node Implementations

Computational Modelling of WDM-ROADM Node Implementations

Wavelength‐transparent IP‐over‐CWDM network with stackable ROADMs for best effort performance

Bi‐directional lightpath reconfiguration in regional IP‐over‐WDM networks by a centralized control system

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