Availability analysis of optical cross-connect implemented by architecture on demand

Self Cite

Elastic optical networks are envisaged as promising solutions to fulfill the diverse bandwidth requirements for the emerging heterogeneous network applications. To support flexible allocation of spectrum resources the optical network nodes need to be agile. Among the different proposed solutions for elastic nodes, the one based on architecture of demand (AoD) exhibits considerable flexibility against the other alternatives. The node modules in the case of AoD are not hard-wired, but can be connected/disconnected to any input/output port according to the requirements. Thus, each AoD node and the network (fabricated with AoD nodes) as a whole acts like an optical field-programmable gate array. This flexibility inherent in AoD can be exploited for different purposes, such as for cost-efficient and energy-efficient design of the networks. This study looks into the cost-efficient network planning issue for synthetic networks implemented through AoD nodes. The problem is formalized as an integer linear programming formulation for presenting the optimal solution. Furthermore, a scalable and effective heuristic algorithm is proposed for cost-efficient design, and its performance is compared with the optimal solution. The designed networks with AoD nodes are further investigated for a dynamic scenario, and their blocking probability due to limited switching resources in the nodes is examined. To alleviate the blocking performance for the dynamic case, an efficient synthesis strategy along with a scheme for optimal placement of switching resources within the network nodes is presented. Extensive results show that 1) even at high loads, the network with AoD nodes achieves saving of switching modules up to 40% compared to the one with static reconfigurable optical adddrop multiplexers (ROADMs) through a proper network design, 2) by diminishing the spectrum selective switches the overall power consumption of the network decreases by more than 25% for high loads, and 3) for the dynamic scenario the blocking owing to the node modules constraint is alleviated significantly by slightly augmenting the switching devices and optimally deploying them within the network nodes.

Section: Introductionmentioning

confidence: 93%

Introducing Flexible and Synthetic Optical Networking: Planning and Operation Based on Network Function Programmable ROADMs

Muhammad

Zervas

Amaya

et al. 2014

Self Cite

“…Precisely, a reduction of synthesized modules in AoD nodes targets an increase of the optical transparent reach overcoming WSS filtering impairments [6], [7]. Further characteristics of AoD have been analyzed in the literature following a stand-alone approach, including: its availability leveraging on the reliability of building modules and optical backplanes [12], the flexibility of the complete node [10], and its power consumption [26].…”

Section: B Stand-alone Function Programmable Nodementioning

confidence: 99%

“…From an academic viewpoint, studies report that AoDbased Function Programmable Optical Networks provides more flexibility [10], scalability [11], availability [12], and resource and cost savings [13] than traditional optical networks. In more detail, recent studies target specific parameters to propose design mechanisms [10]- [12]. Precisely, a synthesis algorithm has been recently proposed to compose stand-alone AoD instances using Spectrum Selective Switches (SSSs), de-multiplexers (DEMUXs) and…”

Section: Introductionmentioning

confidence: 99%

OSNR Aware Composition of an Open and Disaggregated Optical Node and Network

Liu

Peters

Garrich

et al. 2017

Function Programmable Optical Network has been recently proposed to enhance flexibility on optical transport based on Architectureon-Demand (AoD). The flexible synthesis of optical node architectures provided by AoD enables an open and disaggregated optical layer thanks to the available deep programmability. However, previous studies focus on how to synthesize a single node out of switching function blocks neglecting the optical signal-to-noise ratio (OSNR) impact, power imbalance effects due to diverse set of devices traversed per input-output configuration and network-wide implications. In this work, we present Optical Network-wide Function Synthesis (ONetFuS), an algorithm to compose AoD nodes that considers placement and configuration of both switches and amplifiers. ONeFuS minimizes OSNR degradation and deviation across channels and offers enhanced power balance performance. Moreover, ONetFuS addresses multiple-node scenarios to investigate cascading, transmission distance, and networking effects. We compare the number of optical crossconnections computed by our proposal against solutions in the literature. Results in network scenarios including number of components, power balance, OSNR variations and OSNR penalty reductions, prove the suitability of our proposed ONetFuS for Open and Function Programmable Optical Networks.

“…AoD has been shown to provide considerable gains in terms of scalability [11], power consumption [12] and resiliency [26]. More in detail, the work done in [11] and [12] by the same authors is extended here i) presenting a five-step synthesis algorithm for AoD that supports sub-wavelength time-switching requests, ii) a performance analysis in terms of power consumption and number of backplane optical crossconnections and iii) studying space division multiplexing (SDM) and wide available spectrum alternatives to enhance the scalability of AoD in terms of supported throughput.…”

Section: B Architecture On Demandmentioning

confidence: 99%

Architecture on Demand Design for High-Capacity Optical SDM/TDM/FDM Switching

Garrich

Amaya

Zervas

et al. 2014

Self Cite

Reconfigurable optical add/drop multiplexers (ROADMs) are key elements in operators' backbone networks. The breakthrough node concept of Architecture on Demand (AoD) permits to design optical nodes with higher flexibility with respect to ROADMs. In this work, we present a five-step algorithm to design AoD instances according to some given traffic requests, able to support from sub-wavelength time-switching up to wavelength/superchannel/fiber switching. We evaluate AoD performance in terms of power consumption and number of backplane optical cross-connections. Furthermore, we discuss trade-offs involved in the migration from fixed to flexible grid with regard to the optical node size, capacity and power consumption. We compare several ROADM architectures proposed in the literature with AoD in terms of power consumption and cost. We also study different technologies to enhance the scalability of AoD. Results show that AoD can bring significant power savings compared to other architectures while offering a throughput of hundreds of Tb/s.