Experimental Evaluation of an On-line RSA Algorithm for SDN-Controlled Optical Metro Networks with VCSEL-based S-BVTs

Fàbrega

Nadal

et al. 2020

J. Opt. Commun. Netw.

Self Cite

To deal with the challenging requirements of metropolitan area networks (MANs), it is essential to design costeffective systems that can support high capacity and dynamic adaptation, as well as a synergy of programmability and efficient photonic technologies. This becomes crucial for very large MANs that support 5G, where multi-hop connections will need to be dynamically established at target capacities beyond Tb/s. Programmability, automation and modularity of network elements are key desired features. In this work, a modular photonic system, programmable via a software defined networking (SDN) platform, designed for dynamic 5G-supportive MANs, is described and analyzed. We consider modular sliceable bandwidth/bitrate variable transceivers (S-BVTs) based on vertical-cavity surface-emitting laser (VCSEL) technology and dense photonic integration. The proposed system and its programmability are experimentally assessed using VCSEL with 10 GHz bandwidth. The experiments are performed over connections as long as six-hop and 160 km, from low-level aggregation nodes to metro-core nodes, thereby enabling IP off-loading. Furthermore, a numerical model is derived to estimate the performance when adopting higher bandwidth VCSELs (≥ 18 GHz) and integrated coherent receivers, as targeted in the proposed system. The analysis is performed for both 50 GHz and 25 GHz granularities. In the former case, 50 Gb/s capacity per flow can be supported over the targeted connections, for OSNR values above 26 dB. When the granularity is 25 GHz, the filter narrowing effect severely impacts the performance. Nevertheless, 1.2 Tb/s capacity (scalable to higher values if spectral/spatial dimensions are exploited) can be achieved when configuring the S-BVT to enable 40 VCSEL flows. This confirms that the system is promising to support Tb/s connections in future agile MANs.

Section: Programmabilitymentioning

confidence: 99%

Section: Programmabilitymentioning

confidence: 99%

Programmable VCSEL-based photonic system architecture for future agile Tb/s metro networks

Fàbrega

Nadal

et al. 2020

J. Opt. Commun. Netw.

Self Cite

“…Other connection parameters can be also determined through the NBI such as maximum tolerated end-to-end delay, protection/restoration capabilities, imposed optical spectrum needs (e.g., to set up the optical flows in a specific optical frequency range), etc. In the PASSION project, the NBI is based on a RESTful interface as detailed in [4]. The basic elements forming the implementation of the SDN controller are: -Core Logic Control: This function processes the incoming connection requests via the NBI and coordinates the different functionalities in the SDN controller to ensure the workflows when setting up, updating, or removing a connection.…”

Section: Sdn Controller and Network Elements Agent Architecturesmentioning

confidence: 99%

“…). An example of a devised RSA algorithm considering the PASSION project transport solutions is provided in [4]. -Topology and Provisioning Management: this function provides the means to communicate with the underlying network elements and devices (i.e., agents) using the SBI.…”

Section: Sdn Controller and Network Elements Agent Architecturesmentioning

confidence: 99%

“…Figure 1(right) provides a representation of the involved HL nodes for an optical flow from the access-metro border towards the metro-core reference point. A candidate and illustrative optical metro infrastructure considering both the HL optical switches within a specific network topology as well as the use of the modularity feature of the S-BVT can be found in [4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Deployment of an SDN Programmable Optical Metro Network with VCSEL-Based S-BVTs

Martínez

Casellas

2020 22nd International Conference on Transparent Optical Networks (ICTON)

et al. 2020

Self Cite

Upcoming metro networks are required to transport huge and highly dynamic data traffic whilst resulting cost and power efficiency. In this context, the EU-H2020 PASSION project targets such a network design exploiting a solution based on both: i) programmable, modular, cost-efficient and low-power sliceable bandwidth/bitrate variable transceivers (S-BVTs) formed by a pool of vertical cavity surface emitting lasers (VCSEL) and Coherent Receivers (CO-Rx); ii) hierarchical switching nodes in an optical flexi-grid network to provide alloptical transport and aggregation capabilities. In this context, an SDN controller is designed and deployed to attain the automatic programmability of the underlying transport network. Thereby, this work focuses on detailing the specific functions, workflows and control interfaces handled by the SDN controller which are tailored to the imposed requirements and capabilities of the targeted PASSION optical network solution. The goal is to attain the complete data plane configuration (involving several network elements and devices such as S-BVT and optical switches) to dynamically accommodate end-to-end heterogenous data rate optical connections.

Experimental Evaluation of RSA Algorithms for SDN-Programmable VCSEL-Based S-BVT in High-Capacity and Cost-Efficient Optical Metro Networks

Martínez

Casellas

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

et al. 2021

Self Cite

Future metro networks need to increase the transport capacity and improve the cost-and power-efficiency. These challenges are tackled by the EU-H2020 PASSION project exploiting dense photonic integration and cost-efficient optical technologies. Specifically, PASSION investigates a) modular sliceable bandwidth variable transceivers (S-BVTs) built upòn a set of both vertical cavity surface emitting lasers (VCSEL) and Coherent Receivers (CO-Rx); and b) hierarchical switching nodes in a flexigrid network. An SDN controller handles the network programmability where a key functionality is the path computation and resource selection to fulfil the connection requirements. This is conducted by the Routing and Spectrum Assignment (RSA) algorithms. The considered S-BVT transmitter imposes that each S-BVT VCSEL reaches up to 50 Gb/s. Thus, connections requesting higher bandwidth (e.g., 200 Gb/s) are accommodated over several optical flows. In this context, two RSA algorithms called co-routed (RSA-CR) and inversed multiplexed (RSA-IM) optical flows are proposed and compared. The RSA-CR enforces that all the connection's optical flows are routed over the same spatial path; the RSA-IM relaxes this allowing the optical flows being set up over different spatial routes. The experimental evaluation, made upon dynamic traffic, aims at comparing both RSA algorithms performance according to the blocked bandwidth ratio, the average used of S-BVT devices, and the average setup time.