Lightpath Reconfiguration in Regional IP-over-WDM Networks by a Centralized Control System
LCN '07 Proceedings of the 32nd IEEE Conference on Local Computer Networks
Service level agreement and provisioning in optical networks
IEEE Communications Magazine
IPTV and video networks in the 2015 timeframe: The evolution to medianets
IEEE Communications Magazine
Key building blocks for high-capacity WDM photonic transport networks
IEEE Journal on Selected Areas in Communications
WDM optical communication networks: progress and challenges
IEEE Journal on Selected Areas in Communications
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Bidirectional stackable ROADMs (BS-ROADMs) with 3-port optical add/drop multiplexers (OADMs) have been presented for minimizing the lightpath interference during reconfiguration of the ROADMs. The BS-ROADM is constructed by connecting some modules with different wavelengths, and it is reconfigured by adding new modules required in it. The reconfigurations of the BS-ROADMs are done for upgrading the in-service networks to support newly appeared traffic demand. The experimental results presented in this paper clarify that the BS-ROADM can multiplex and demultiplex the wavelengths successfully without limiting the pass-through wavelengths, providing the wavelength transparent networks. The reconfiguration of an in-service BS-ROADM can be made without influencing any lightpath in the network, and this type of BS-ROADMs is used for premium users. However, while adding a new module in comparatively low-cost BS-ROADMs in-service, the transmission break of some lightpaths might be taken place. The investigated transmission break time was limited within recovery time specified in the service level agreement for best-effort transmission, which has strong cost-effectiveness rather than high QoS. This upgradability of the BS-ROADMs adds more flexibility in coarse wavelength division multiplexing networks in terms of scalability and reconfigurability.