A demonstration of ultra-low-latency data center optical circuit switching

FarringtonNathan,; PorterGeorge,; SunPang-Chen,; ForencichAlex,; FordJoseph,; FainmanYeshaiahu,; PapenGeorge,; VahdatAmin,

doi:10.1145/2377677.2377698

Cited by 13 publications

(9 citation statements)

References 5 publications

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“…4) Reduced number of cables benefitted from the high port capacity may facilitate the deployment and management of the network. Several optical switching schemes mainly based on optical circuit switching (OCS), optical burst switching (OBS) and optical packet switching (OPS) have been proposed and investigated for DC applications [10]- [12]. OCS has also been introduced into electrical switch based network to offload the long-lived traffic [13], [14].…”

Section: ) Massive O/e/o Conversions Can Be Eliminated Improvingmentioning

confidence: 99%

Towards Petabit/s All-Optical Flat Data Center Networks Based on WDM Optical Cross-Connect Switches with Flow Control

Miao

Yan

Calabretta

2016

J. Lightwave Technol.

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Scaling the capacity while maintaining low latency and power consumption is a challenge for hierarchical data center networks (DCNs) based on electrical switches. In this work we present a novel all-optical flat DCN architecture OPSquare that potentially addresses the scaling issues by employing parallel intra-/inter-cluster switching networks, distributed fast WDM optical cross-connect (OXC) switches, and a novel top-of-rack (ToR) switch architecture. The fast (nanoseconds) WDM OXC switches allow flexible switching capability in both wavelength and time domains and statistical multiplexing. The OPSquare DCN performance targeting Petabit/s capacity has been thoroughly assessed. First the packet loss, latency, throughput, and scalability are numerically investigated under realistic data center traffic model. Results indicate that when scaling the DCN size up to 1024 ToR switches, a packet loss ratio below 10 −6 and a server end-to-end latency lower than 2 μs can be guaranteed at load of 0.3 with limited 20 kB buffer. Then, the experimental evaluation of the DCN by employing 4 × 4 OXC prototypes shows multi-path dynamic switching with flow control operation. The case deploying 32 × 32 and 64 × 64 OXC switches connecting 1024 and 4096 ToRs are emulated and limited performance degradation has been observed. The potential of switching higher-order modulation and waveband signals further proves the suitability of OPSquare architecture for Petabit/s and low-latency DCN by using optical switches with moderate radix.Index Terms-Data center network, flow control, optical cross-connect, optical packet switching, wavelength division multiplexing.

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Section: ) Massive O/e/o Conversions Can Be Eliminated Improvingmentioning

confidence: 99%

Towards Petabit/s All-Optical Flat Data Center Networks Based on WDM Optical Cross-Connect Switches with Flow Control

Miao

Yan

Calabretta

2016

J. Lightwave Technol.

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“…The DMD is an array of micro-mirrrors (~ 10 µm pitch) where individual orientation can be digitally set to either +12° or -12°, relative to the surface plane. The refresh rate of the mirror orientation over the entire surface of the DMD is 23 kHz, with a loss of light time that has been measured to be only 12 µs during reconfiguration [6].…”

Section: System Designmentioning

confidence: 99%

32 × 32 Port Microsecond Reconfigurable All-Optical Cross Connect

Blanche

Lynn

Miles

et al. 2014

Frontiers in Optics 2014

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We present a 32 × 32 port optical cross connect that uses diffraction from a Texas Instruments Digital Micromirror Device (DMD) as the switching element. This system is capable of switching from any input to any output single mode optical fiber with a reconfiguration time of 12 µs. Once set, the latency of the system is only due to the free-space travel of light through the optics, and is about 2 ns. The switch is polarization, data rate, and protocol agnostic, so it will retain its relevance regardless of advances in optical signal formatting. The power consumption of the switch is also independent of the data rate. In addition, considering that all the elements are available off the shelf, the switch is cost-effective.

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“…Here, Nathan introduced Traffic Matrix Scheduling: the idea is to repeatedly iterate between a series of switch configurations (input-output assignments), such that the collection of all assignments fulfills the entire traffic matrix, including the mice. This algorithm requires much faster switching than hotspot schedulers, but by a remarkable stroke of good fortune, Farrington et al [1] are also building an optical switch with microsecond-level switching times. Question: Once you reach 100% of traffic over optical, is there anything stopping you from eliminating the packet switched network entirely?…”

Section: Mobile and Wirelessmentioning

confidence: 99%