Hybrid Optical Switching for Data Center Networks

Fiorani, Matteo; Aleksić, Slaviša; Casoni, Maurizio

doi:10.1155/2014/139213

Cited by 19 publications

(8 citation statements)

References 20 publications

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“…Optical interconnect architectures that are based on fast and slow optical switches are presented in studies [13,[16][17][18]25]. The LIGHTNESS is a hybrid design that uses fast and slow optical switches in the core [25].…”

Section: Architectures Based On Fast and Slow Optical Switchesmentioning

confidence: 99%

See 1 more Smart Citation

Optical Interconnects for Cloud Computing Data Centers: Recent Advances and Future Challenges

Imran¹,

Haleem²

2018

Proceedings of International Symposium on Grids and Clouds 2018 in Conjunction With Frontiers in Computational Drug Discovery —

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Section: Architectures Based On Fast and Slow Optical Switchesmentioning

confidence: 99%

“…Optical circuit switching with slow optical switches and optical packet switching with fast optical switches are used. Hybrid optical switching (HOS) [13] comprises three layers of fast and slow optical switches. It uses, packet, burst and circuit switching.…”

Section: Architectures Based On Fast and Slow Optical Switchesmentioning

confidence: 99%

Optical Interconnects for Cloud Computing Data Centers: Recent Advances and Future Challenges

Imran¹,

Haleem²

2018

Proceedings of International Symposium on Grids and Clouds 2018 in Conjunction With Frontiers in Computational Drug Discovery —

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“…The c-through [10] and HOS [11] are two examples of hybrid electronic/optical interconnection solutions. In these hybrid interconnect architectures, optical circuit switches (OCS) are employed to provide high capacity for transmitting long-lived and bandwidth-consuming traffic flows (e.g., elephant flows) due to the long reconfiguration time of OCS, and EPS is used to transmit short-lived traffic flows that do not need large bandwidth (e.g., mice flows).…”

Section: Related Workmentioning

confidence: 99%

POTORI: A Passive Optical Top-of-Rack Interconnect Architecture for Data Centers

Cheng¹,

Fiorani²,

Lin³

et al. 2017

J. Opt. Commun. Netw.

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Abstract-Several optical interconnect architectures inside data centers (DCs) have been proposed to efficiently handle the rapidly growing traffic demand. However, not many works have tackled the interconnects at top-of-rack (ToR), which have a large impact on the performance of the data center networks (DCNs) and can introduce serious scalability limitations due to the high cost and power consumption. In this paper, we propose a passive optical ToR interconnect architecture (POTORI) to replace the conventional electronic packet switch (EPS) in the access tier of DCNs. In the data plane, POTORI relies on a passive optical coupler to interconnect the servers within the rack and the interfaces toward the aggregation/core tiers. The POTORI control plane is based on a centralized rack controller responsible for managing the communications among the servers in the rack. We propose a cycle-based medium access control (MAC) protocol to efficiently manage the exchange of control messages and the data transmission inside the rack. We also introduce and evaluate a dynamic bandwidth allocation (DBA) algorithm for POTORI, namely Largest First (LF). Extensive simulation results show that, with the use of fast tunable optical transceivers, POTORI and the proposed LF strategy are able to achieve an average packet delay below 10 µs under realistic DC traffic scenarios, which outperforms conventional EPSs. On the other hand, with slower tunable optical transceivers, a careful configuration of the network parameters (e.g., maximum cycletime of the MAC protocol) is necessary to obtain a good network performance in terms of the average packet delay.Index Terms-Optical interconnect architectures, data center networks, medium access control (MAC), dynamic bandwidth allocation (DBA).

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“…100µs aggregation time for burst generation and 500KB for burst length was considered. We selected three values of TDC (1,10,20) and five values of stability (100, 200, 300, 400, 500)ms in order to evaluate their impact on performance of the system. Simulation time was set to 2 second.…”

Section: Traffic Generationmentioning

confidence: 99%

“…Hybrid optical switching scheme [10] is based on fast and slow optical switches and is arranged into 3 stage clos architecture at the core node. Edge node classifies incoming traffic into four types.…”

Section: Introductionmentioning

confidence: 99%

Hosa

Imran

Collier

Landais

et al. 2015

Proceedings of the 12th ACM International Conference on Computing Frontiers

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Optical interconnect is a fundamental requisite to realize Internet-scale data centers due to capabilities and benefits of optical devices. Optical interconnects are energy efficient and offer massive bandwidth support. State of the art interconnects can be divided into three types based on the optical technology used: 1) micro-electromechanical system (MEMS) optical cross connects (OXCs), 2) arrayed waveguide grating routers (AWGRs) and 3) semiconductor optical amplifiers (SOAs). MEMS switches are based on mature technology, have low insertion loss and cross-talk, and are data rate independent. They are also the most scalable and the cheapest class of optical switches. However, the reconfiguration time of these switches is in the order of tens of milliseconds. An AWGR switch is a passive device and works in conjunction with tunable wavelength converters (TWCs) or tunable lasers (TLs) while an SOA works as a gate element that manipulates light and also compensates for losses that occur during transmission of optical signals. AWGR and SOA switches have switching time in the range of nanoseconds but they are expensive as compared to MEMS. In this paper, we propose a novel all optical core interconnection scheme that utilizes potentials of both slow and fast optical switches. The core idea is to route traffic through slow or fast optical switch so that minimum end-toend latency is achieved. Our architecture employs a single stage topology which allows our design to both incrementally scaled up (in capacity) and scaled out (in the number of racks) without requiring major re-cabling and network reconfiguration. We evaluate performance of the system using simulation and investigate a trade-off between cost and power consumption by comparing it with other well known interconnects. Our technique demonstrates a considerable c ⃝2015 Association for Computing Machinery. ACM acknowledges that this contribution was authored or co-authored by an employee, contractor or affiliate of a national government. As such, the Government retains a nonexclusive, royalty-free right to publish or reproduce this article, or to allow others to do so, for Government purposes only. improvement in power consumption and low latency with high throughput is achieved.

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Hybrid Optical Switching for Data Center Networks

Cited by 19 publications

References 20 publications

Optical Interconnects for Cloud Computing Data Centers: Recent Advances and Future Challenges

Optical Interconnects for Cloud Computing Data Centers: Recent Advances and Future Challenges

POTORI: A Passive Optical Top-of-Rack Interconnect Architecture for Data Centers

Hosa

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