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Primeur weekly 2011-08-22

Exascale supercomputing

Japan plans to invest $1.3 billion to develop supercomputer

NVIDIA taps industry veteran Steve Scott to help shape the future of high performance computing

The Cloud

Regulus Communications launches Cloud resources for health information technology

ISGC 2012 to issue Call for Papers

Erlang Solutions and Massive Solutions partner to bring supercomputing to the mass market

Biomedical research gets its head into Cloud computing

HP to acquire enterprise information management software company Autonomy Corporation plc

Convenience store chain chooses IBM to collaborate in the Cloud

VMware vCloud Powered programme gains traction with service provider ecosystem, delivering customers a broad array of public Clouds compatible with VMware platform

VMware CEO Paul Maritz highlights benefits of Cloud computing at DISA Customer & Industry Forum

U.S. Government agencies embrace desktop virtualization with VMware View to accelerate their mission

EuroFlash

Norwegian University of Science and Technology selects SGI to take weather forecasting and national research capabilities to the next level

T-Platforms computer cluster is applied for simulation of biopolymers and development of the latest medicines

ClusterVision honours leading scientific researchers at the University of Birmingham

USFlash

NSF funds research to simulate geoscience field trips

HP confirms discussions with Autonomy regarding possible business combination

IBM unveils cognitive computing chips

Optics Express focus issue highlights research to increase Internet bandwidth capacity

Strain and spin may enable ultra-low-energy computing

SGI acquires OpenCFD Ltd., an expert in open source computational fluid dynamics (CFD) software

SGI reports record results for fiscal fourth quarter and full year 2011

Optics Express focus issue highlights research to increase Internet bandwidth capacity

15 Aug 2011 Washington - Optical fiber communication is the backbone for the telecommunications infrastructure that supports the Internet. Fueled by emerging bandwidth-hungry applications and increases in computer processing power, Internet traffic has sustained exponential growth and this trend is expected to continue for the foreseeable future.

To highlight research being carried out to ensure that the capacity of fiber optic communication systems can handle this rapidly increasing demand, and thus to address the Internet capacity crunch, the editors of the Optical Society's (OSA) open-access journalOptics Expresshave published a special Focus Issue on Space Multiplexed Optical Transmission. The issue is organized and edited by Guifang Li of the University of Central Florida and Xiang Liu of Bell Labs, Alcatel-Lucent.

The Focus Issue describes different approaches to increase the information carrying capacity of optical fibers. One of these, Space-Division Multiplexing (SDM), uses fibers with seven cores, rather than a single one. By using all seven cores, seven independent signals can be carried, and the fiber capacity can thus, in principle, be increased seven-fold. In other approaches, such as Mode-Division Multiplexing (MDM) a single core carries multiple information channels, each of which is associated with a different physical shape of the light field, also increasing the fiber capacity.

According to Xiang Liu, "Our goal in producing this focus issue was to provide a comprehensive survey of the state-of-the-art research activities in multiplexed transmission, which holds potential for addressing the challenges of capacity growth in optical communications."

"We hope this collection will stimulate future research on this subject to address the remaining fundamental and practical challenges, potentially enabling dramatic capacity growth in future optical communication systems", stated Guifang Li.

It is well known that the capacity of a communication channel is constrained by the Shannon limit. In optical fiber communication, fiber nonlinearity imposes an additional limit in the high power or high

signal-to-noise ratio (SNR) regime. Digital coherent detection increases optical signal tolerance to linear noise such as amplified spontaneous emission noise, and sometimes non-linear phase noise. However, the single-channel capacity increase scales logarithmically with the increase in SNR. This logarithmical

single-channel capacity scaling ultimately will not be able to support exponential traffic growth.

While it might be impossible to provide exponential single-channel capacity growth in optical communication, multiplicative growth in optical communication capacity has satisfied traffic demand in the past, especially when dense wavelength-division multiplexing (DWDM) with a multiplicative factor on the order of 100 was invented. As today's DWDM coherent optical communication technology has already taken advantage of all degrees of freedom of a light wave in a single-mode fiber, namely frequency, polarization, amplitude, and phase, further multiplicative growth has to explore new degrees of freedom. MDM using few-mode fibers (FMF) and SDM using multi-core fibers (MCF) have emerged as promising candidates for the next multiplicative capacity growth for optical communication. ThisOptics ExpressFocus Issue features the state-of-the-art research activities in MDM and SDM aimed at order-of-magnitude capacity growth in future optical communication systems.

The following papers are some of the highlights of theOptics ExpressFocus Issue on Space Multiplexed Optical Transmission. All are included in Volume 19, issue 17 and can be accessed on-line at http://www.opticsinfobase.org/oe

A paper from B. Zhu et al. of OFS Labs and Bell Labs reports a transmission capacity of 112 Tb/s over a distance of 76.8-km using SDM in a 7-core fiber using SDM and DWDM in the C and L bands. Each of the 7 cores carried 160 polarization-division multiplexed quadrature phase-shift keying (PDM-QPSK) channels at 107-Gb/s on a 50-GHz grid, resulting in an aggregate spectral efficiency of 14 b/s/Hz. The impact of the inter-core crosstalk was experimentally investigated and the system implications of core-to-core crosstalk on long-haul transmission were discussed. pp. 16665-16671 ( http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-17-16665 )

T. Hayashi et al. from Sumitomo Electric Industries report an ultra-low-crosstalk MCF that is suitable for ultra-long-haul transmission. A remarkably low inter-core crosstalk level of below -62 dB was achieved in a 17.4-km 7-core fiber, by using a trench-assisted index profile. A transmission capacity of 109 Tb/s was recently demonstrated by using SDM and DWDM with this ultra-low-crosstalk MCF. pp. 16576-16592 ( http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-17-16576 )

S. Randel et al. from Bell Labs and OFS labs present the transmission of three 112-Gb/s PDM-QPSK signals over the fundamental mode (LP01) and two orthogonal LP11 modes of a 33-km FMF. 6x6 MIMO processing was used to achieve the separation of the three spatial modes and the two polarizations of the transmitted signals. These experiments show the feasibility of scaling capacity using MDM in FMF in combination with MIMO signal processing. pp. 16697-16707 (<A href="http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-17-16697">http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-17-16697</a>)

K. S. Abedin et al. from OFS Labs have demonstrated a multicore Erbium-doped fiber (MC-EDF) amplifier for simultaneous amplification in its 7 cores. The pump and signal were coupled to individual cores of the MC-EDF using two tapered fiber bundled (TFB) couplers. The average gain achieved in the MC-EDF amplifier was 30 dB, and noise figure was less than 4 dB. pp. 16715-16721 ( http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-17-16715 )
Source: Optical Society of America

Back to Table of contents

Primeur weekly 2011-08-22

Exascale supercomputing

Japan plans to invest $1.3 billion to develop supercomputer

NVIDIA taps industry veteran Steve Scott to help shape the future of high performance computing

The Cloud

Regulus Communications launches Cloud resources for health information technology

ISGC 2012 to issue Call for Papers

Erlang Solutions and Massive Solutions partner to bring supercomputing to the mass market

Biomedical research gets its head into Cloud computing

HP to acquire enterprise information management software company Autonomy Corporation plc

Convenience store chain chooses IBM to collaborate in the Cloud

VMware vCloud Powered programme gains traction with service provider ecosystem, delivering customers a broad array of public Clouds compatible with VMware platform

VMware CEO Paul Maritz highlights benefits of Cloud computing at DISA Customer & Industry Forum

U.S. Government agencies embrace desktop virtualization with VMware View to accelerate their mission

EuroFlash

Norwegian University of Science and Technology selects SGI to take weather forecasting and national research capabilities to the next level

T-Platforms computer cluster is applied for simulation of biopolymers and development of the latest medicines

ClusterVision honours leading scientific researchers at the University of Birmingham

USFlash

NSF funds research to simulate geoscience field trips

HP confirms discussions with Autonomy regarding possible business combination

IBM unveils cognitive computing chips

Optics Express focus issue highlights research to increase Internet bandwidth capacity

Strain and spin may enable ultra-low-energy computing

SGI acquires OpenCFD Ltd., an expert in open source computational fluid dynamics (CFD) software

SGI reports record results for fiscal fourth quarter and full year 2011