Realizing the advantages of optical reconfigurability and restoration with integrated optical cross-connects

Strand, John; Chiu, Angela

doi:10.1109/jlt.2003.819539

Cited by 31 publications

(14 citation statements)

References 9 publications

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“…It also provides network operators a way to dynamically drop and add wavelengths at network nodes without having to manually balance optical parameters every time when distances traveled by individual wavelengths are changed. Figure 2 illustrates a state-of-art ROADM architecture with a broadcast-and-select switch fabric [13,14,15,4,16]: splitters send copies of each entering multi-channel signal to each output port. Nx1 wavelength selective switches (WSS's) are used to choose which of the input channels at each frequency to put on the output fiber.…”

Section: Next Generation Core Optical Network Architecturementioning

confidence: 99%

“…In order to provide fast and cost effective restoration, we propose to use shared mesh restoration with standbys extended from our previous work [4,24]. The standbys provide connectivity between switching nodes (nodes with fiber link degree-2 or higher).…”

Section: Wavelength Service Restoration: Shared Mesh Restoration Withmentioning

confidence: 99%

“…All-optical switching is used at the intermediate nodes along a standby's path. As in [4,24], the standbys can be pre-configured using OEO regenerators at their two ends which send test signals continuously. This overcomes the problem of optical impairments for long connections, avoids today's wavelength power "balancing" delays, provides wavelength conversion for capacity efficiency and allows sharing of links across non-simultaneous failures.…”

Section: Wavelength Service Restoration: Shared Mesh Restoration Withmentioning

confidence: 99%

“…• 1:N Interface Protection [27,4]: The goal here is to provide rapid recovery from the failure of a router or ROADM line card or the connection between a router line card and the ROADM port. If one of the N working interfaces fails for whatever reason, the ROADM will rapidly switch the failed connection to the (spare) protection interface and (spare) line cards.…”

Section: Integrated Ip-over-optical Layer Restorationmentioning

confidence: 99%

“…This can be done via (1) converting the terminals and degree-2 ROADMs to higherdegree ROADMs to switch and route wavelengths optically [3,4], also called as photonic cross connect (PXC), and (2) strategically placing OEO regenerators to reduce cost.…”

Section: Introductionmentioning

confidence: 99%

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Restoration Design in IP over Reconfigurable All-Optical Networks

Chiu

Choudhury

Doverspike

et al. 2007

Lecture Notes in Computer Science

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Abstract. Large IP backbone networks today are mostly deployed directly over sequences of point-to-point DWDM systems or chains of newer ROADM-based ultra long haul systems, interconnected by OEO regenerators. The next generation core optical network is moving toward an all-optical network architecture that is based on multi-degree ROADMs to reduce OEO regeneration cost as well as enabling automatic reconfigurability and dynamic restoration. In this paper, we study the restoration design in this new IP over reconfigurable all-optical network architecture to satisfy the resilience requirements for both IP and wavelength services. We propose two novel restoration schemes: 2-Phase Fast Reroute mechanism with optimized Traffic Engineering algorithm for restoring IP services and shared mesh restoration with standbys for restoring wavelength services. They both meet the requirement of sub-second restoration time and also maximize sharing among different failures with the objective of minimizing either overall capacity or overall cost. To further reduce the required restoration capacity in both IP layer and optical layer and address failures in both layers efficiently, we also propose an integrated IP-over-optical layer restoration strategy that enables sharing of restoration capacity among non-simultaneous failures across both IP and optical layers. Simulation results demonstrate significant improvements using our proposed schemes comparing with existing ones.

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Section: Next Generation Core Optical Network Architecturementioning

confidence: 99%

Section: Wavelength Service Restoration: Shared Mesh Restoration Withmentioning

confidence: 99%

Section: Wavelength Service Restoration: Shared Mesh Restoration Withmentioning

confidence: 99%

Section: Integrated Ip-over-optical Layer Restorationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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