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FEC In Optical Transmission

When we introduced the DWDM optics, we left out one important ingredient that really makes the difference: Forward Error Correction (FEC). FEC is what permits networking equipment to receive a degraded signal, and still deliver error free traffic to the end user, correcting transmission errors.

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Manufacturer: ProLabs
Technology: Networking & Communications

Laser Sources For Optical Transceivers

Optical transceivers use different semiconductor laser sources depending mainly on the reach and bit rate that the device has to guarantee. In this paper we will describe the most commonly used types and their application. We will skip the physics of the laser and semiconductors; we will focus only on the technological aspects of each device.

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Manufacturer: ProLabs

Modulation of Light

A key functionality of an optical system is the modulation operation, which consists in “converting” the electrical data signal into the optical domain. Ideal modulation is therefore equivalent to performing a frequency translation from the baseband to an optical carrier frequency, of the order of 193x1012 Hz for the usual 1550 nm transmission windowt.

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Manufacturer: ProLabs

Understanding DWDM & Optical Communication

Without optical communication we would be still sending mail, going to the newsstand to buy a newspaper, sending mail and postcards and renting movies, no internet would have been possible, no digital communications as we know it.

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Manufacturer: ProLabs

Mellanox White Paper - Weather Research and Forecast (WRF) Model Port to Windows: Preliminary Report

The Weather Research and Forecast (WRF) project is a multi-year/multi-institution collaboration to develop a next generation regional forecast model and data assimilation system for operational numerical weather prediction (NWP) and atmospheric research. Under this project – a collaboration between The National Center for Atmospheric Research (NCAR), Microsoft Corporation, Advanced Micro Devices, Inc., and The Portland Group, Inc (PGI) – a prototype version of WRF has been developed and demonstrated running in parallel using MPI on an AMD Opteron™ dual-core processor based server running Windows Compute Cluster Server 2003, Microsoft Compute Cluster Pack,. This preliminary report describes progress and issues encountered in porting WRF to an HPC cluster running Windows, using Microsoft Subsystem for UNIX-based Applications (SUA) and the PGI Fortran compiler.

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Technology: Networking & Communications
Sector: Research
Manufacturer: Mellanox
 
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