Multiwavelength parallel optical interconnects for massively parallel processing

Patel, R.; Bond, Steven W.; Pocha, M.D.; Larson, M.C.; Garrett, Henry E.; Drayton, R.F.; Petersen, H.E.; Krol, Denise M.; Deri, Robert J.; Lowry, Mark

doi:10.1109/jstqe.2003.813313

Cited by 15 publications

(6 citation statements)

References 34 publications

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“…Multiwavelength transmitters require either a tunable laser or an array of fixed wavelength lasers. Multiple wavelength VCSEL arrays could be the design choice for laser sources both for inter-and intragroup communications [22]. Multiwavelength VCSEL array consisting up to 16 channels having a maximum wavelength span of 46 nm, emitting at 1.1-1.2 m and a wavelength spacing of 0.7 nm have been reported [12].…”

Section: A Optical Component Specificationsmentioning

confidence: 99%

RAPID: Reconfigurable and Scalable All-Photonic Interconnect for Distributed Shared Memory Multiprocessors

Kodi

Louri

2004

J. Lightwave Technol.

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Abstract-In this paper, we describe the design and analysis of a scalable architecture suitable for large-scale distributed shared memory (DSM) systems. The approach is based on an interconnect technology which combines optical components and a novel architecture design. In DSM systems, numerous shared memory transactions such as requests, responses and acknowledgment messages propagate simultaneously in the network. As the network size increases, network contention results in increasing the critical remote memory access latency, which significantly penalizes the performance of DSM systems. In our proposed architecture called reconfigurable and scalable all-photonic interconnect for distributed-shared memory (RAPID), we provide high connectivity by maximizing the channel availability for remote communication to reduce the critical remote latency. RAPID provides fast and efficient unicast, multicast and broadcast capabilities using a combination of aggressively designed wavelength division multiplexing (WDM), time division multiplexing (TDM), and space division multiplexing (SDM) techniques. RAPID is wavelength-routed, permitting the same limited set of wavelength to be reused among all processors. We evaluated RAPID based on network characteristics, power budget criteria, and by simulation using synthetic traffic workloads and compared it against other networks such as electrical ring, torus, mesh, and hypercube networks. We found that RAPID outperforms all networks and still provides good performance as the network is scaled to very large numbers.Index Terms-Cache coherence, distributed shared memory, optical interconnects, scalable optical networks.

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Section: A Optical Component Specificationsmentioning

confidence: 99%

RAPID: Reconfigurable and Scalable All-Photonic Interconnect for Distributed Shared Memory Multiprocessors

Kodi

Louri

2004

J. Lightwave Technol.

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“…High-speed tunable short-wavelength VCSELs are suitable for parallel optical interconnects with applications in massively parallel processing systems. 1 In this application a single array of tunable VCSELs can replace a multiple array of fixed-wavelength VCSELs. These VCSELs can be used also in reconfigurable multiprocessor interconnects in combination with selective optical broadcast components (SOB).…”

Section: Introductionmentioning

confidence: 99%

Polarization investigation of a tunable high-speed short-wavelength bulk-micromachined MEMS-VCSEL

et al. 2012

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We report the investigation of the state of polarization (SOP) of a tunable vertical-cavity surface-emitting laser (VCSEL) operating near 850 nm with a mode-hop free single-mode tuning range of about 12 nm and an amplitude modulation bandwidth of about 5 GHz. In addition, the effect of a sub-wavelength grating on the device and its influence on the polarization stability and polarization switching has been investigated. The VCSEL with an integrated sub-wavelength grating shows a stable SOP with a polarization mode suppression ratio (PMSR) more than 35 dB during the tuning.

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“…This gap in performance becomes a significant problem in massively parallel processing (MPP) systems. 11 Electrical interconnects suffer from attenuation, crosstalk and reflections inside the electrical signal lines which becomes even worse for higher bus speeds. Thus optical interconnects using WDM are very attractive for MPP or DSM systems.…”

Section: Introductionmentioning

confidence: 99%

“…They enable a significant increase in bandwidth as well as more complex interconnect topologies. 11 Many different concepts for tunable laser sources have been investigated in the past decades. [13][14][15] Tunability describes the ability of a single mode laser to change its operating wavelength via an external control parameter.…”

Section: Introductionmentioning

confidence: 99%

Tuneable VCSEL aiming for the application in interconnects and short haul systems

et al. 2011

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Widely tunable vertical cavity surface emitting lasers (VCSEL) are of high interest for optical communications, gas spectroscopy and fiber-Bragg-grating measurements. In this paper we present tunable VCSEL operating at wavelengths around 850 nm and 1550 nm with tuning ranges up to 20 nm and 76 nm, respectively. The first versions of VCSEL operating at 1550 nm with 76 nm tuning range and an output power of 1.3 mW were not designed for high speed modulation, but for applications where only stable continuous tuning is essential (e.g. gas sensing). The next step was the design of non-tunable VCSEL showing high speed modulation frequencies of 10 GHz with side mode suppression ratios beyond 50 dB. The latest version of these devices show record output powers of 6.7 mW at 20 • C and 3 mW at 80 • C. The emphasis of our present and future work lies on the combination of both technologies. The tunable VCSEL operating in the 850 nm-region reaches a modulation bandwidth of 5.5 GHz with an output power of 0.8 mW.

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Multiwavelength parallel optical interconnects for massively parallel processing

Cited by 15 publications

References 34 publications

RAPID: Reconfigurable and Scalable All-Photonic Interconnect for Distributed Shared Memory Multiprocessors

RAPID: Reconfigurable and Scalable All-Photonic Interconnect for Distributed Shared Memory Multiprocessors

Polarization investigation of a tunable high-speed short-wavelength bulk-micromachined MEMS-VCSEL

Tuneable VCSEL aiming for the application in interconnects and short haul systems

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