The OSMOSIS Optical Packet Switch for Supercomputers

Luijten, Ronald P.; Grzybowski, Richard

doi:10.1364/ofc.2009.otuf3

Cited by 37 publications

(24 citation statements)

References 3 publications

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“…A few years ago, in a joint industrial effort IBM and Corning initiated the OSMOSIS project, Optical Shared MemOry Supercomputer Interconnect System, to develop optical packet switching technologies for HPC (high performance computing) [61,62]. They demonstrated a 64 wavelength port by 64 wavelength port switch with less than 250 ns switch fabric latency and input electronic queueing for switching signals of 40 Gbps capacity in a time-slotted fashion.…”

Section: Optical Packet Switchingmentioning

confidence: 99%

Optical Switching in Next Generation Data Centers

Testa¹,

Pavesi²

2018

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This thesis presents advanced optical connectivity solutions for next-generation data centers, spanning millions of processing cores. The wavelength routing of optical packets based on arrayed waveguide gratings (AWGs), tunable wavelength converters (TWCs), and fiber delay lines (FDLs) is a disruptive technology for capacity, footprint, and flexibility requirements of massive cloud data centers. We develop a wavelength-division multiplexed (WDM) design based on Birkhoff-von Neumann architecture as a bitrate transparent, scalable solution to switching bottlenecks in data center networks. As no mature all-optical buffering technology is currently available, central to our design is the buffering strategy that we adopt to store contending packets. Due to the limited number of FDLs, packet drops are common in optical packet switching (OPS) data centers and limit the network throughput. In a practical scenario, physical layer impairments, predominantly amplified spontaneous emission (ASE) noise and crosstalk, degrade Q-factor and lead to additional packet drops. To examine the performance of optical buffer units more accurately, we develop a unified analysis framework, integrating the network layer and the physical layer effects. Using this framework, we refine our architectures and provide guidelines for minimizing the physical layer impact. Besides, optical switch designs should not neglect the diversity of data center traffic patterns when developing connectivity solutions. Empirical studies of data center network traffic reveal that server traffic exhibits strong spatial and temporal correlations. We examine the effectiveness of an AWG-based load balancer with round-robin tuning TWCs in resolving congestion penalties in the data center network. Our cross-layer analysis suggests that the physical layer impairments due to the load balancer hardware could counteract its potential gains and lead to significant throughput degradation. To resolve this challenge, we develop a novel modular router architecture based on WDM shared recirculation buffers that integrates the functions of load balancing and routing and maximizes the optical buffering gains. The router employs a load-balancing scheduler to maximize throughput and minimize delay. Our mathematical analysis and Monte Carlo simulations show that the consolidation of optical buffer slots into WDM FDLs accompanied with internal load balancing leads to a virtually lossless router, resilient to data center traffic anomalies.ii

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Section: Optical Packet Switchingmentioning

confidence: 99%

Optical Switching in Next Generation Data Centers

Testa¹,

Pavesi²

2018

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“…Furthermore, SOA-based gate switches can enable passbands of several Terahertz, colorless and wavelength multiplexed routing [20]. System integrators have demonstrated large optical fabrics using multiple stages and planes of discrete components [21,22]. These successes have led to a renewed interest in large-scale photonic integration as a route to more flexible and lossless routing systems to reduce system level complexity.…”

Section: Monolithically Integrated Fast Optical Switchingmentioning

confidence: 99%

Towards Large-Scale Fast Reprogrammable SOA-Based Photonic Integrated Switch Circuits

Stabile

2017

Applied Sciences

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Due to the exponentially increasing connectivity and bandwidth demand from the Internet, the most advanced examples of medium-scale fast reconfigurable photonic integrated switch circuits are offered by research carried out for data-and computer-communication applications, where network flexibility at a high speed and high connectivity are provided to suit network demand. Recently we have prototyped optical switching circuits using monolithic integration technology with up to several hundreds of integrated optical components per chip for high connectivity. In this paper, the current status of fast reconfigurable medium-scale indium phosphide (InP) integrated photonic switch matrices based on the use of semiconductor optical amplifier (SOA) gates is reviewed, focusing on broadband and cross-connecting monolithic implementations, granting a connectivity of up to sixteen input ports, sixteen output ports, and sixty-four channels, respectively. The opportunities for increasing connectivity, enabling nanosecond order reconfigurability, and introducing distributed optical power monitoring at the physical layer are highlighted. Complementary architecture based on resonant switching elements on the same material platform are also discussed for power efficient switching. Performance projections related to the physical layer are presented and strategies for improvements are discussed in view of opening a route towards large-scale power efficient fast reprogrammable photonic integrated switching circuits.

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“…Wavelength multiplexed routing in a 12×12 switch exploiting three stages of concatenated 1×2 SOAswitches enables Terabit class interconnection (Liboiron-Ladouceur et al, 2006). Two stages of SOA gates are implemented in a 64×64 wavelength routed architecture proposed for supercomputers (Luijten & Grzybowski, 2009). Connectivity for integrated photonic circuits has recently been increased to record levels through the use of the Clos-Broadcast/Select architecture highlighted in Figure 4.…”

Section: Multi-stage Interconnection Networkmentioning

confidence: 99%

Photonic Integrated Semiconductor Optical Amplifier Switch Circuits

Williams

2011

Advances in Optical Amplifiers

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The OSMOSIS Optical Packet Switch for Supercomputers

Cited by 37 publications

References 3 publications

Optical Switching in Next Generation Data Centers

Optical Switching in Next Generation Data Centers

Towards Large-Scale Fast Reprogrammable SOA-Based Photonic Integrated Switch Circuits

Photonic Integrated Semiconductor Optical Amplifier Switch Circuits

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