Development of Industry’s First Media Converter in Compliance with 40 Gigabit Ethernet Standard by Hitachi Cable
In order to cope with overwhelmingly growing volumes of data transmission with in the network cause by introduction of various IT systems such as IP telephony and TV conferencing as well as Web access, e-mailing and file sharing just to name a few has forced organization to switch interoffice networks from the conventional dedicated telecommunication lines such as ATM and SONET to much faster, high-capacity and cost effective wide area Ethernet networks. As a result of this IEEE802 committee is working toward standardization of next generation 40 Gigabit/100 Gigabit Ethernet. Based on this standard, Hitachi cable has made an announcement on development of industry’s first media converter in compliance with new 40 Gigabit Ethernet interface standard.
The newly developed XLGMC-1001 adopts a Wavelength Division Multiplexing (WDM) transmission system capable of dividing the 40 Gigabit Ethernet signal into four 10 Gigabit signals and encode them for transmission. The new XLGMC-1001 is capable of eliminating the effects of Chromatic Dispersion (CD) and Polarization Mode Dispersion (PDM), two major obstacles in high-speed transmission in achieving one-fiber bi-directional transmission for a maximum transmission distance of 80 km which makes it equivalent to conventional 10 Gigabit media converter. The XLGMC-1001 comes with a QSFP transceiver port as a user interface, in providing support for 40GBASE-SR4 for connection to multimode optical fiber cable and 40GBASE-CR4 for connection to copper cable. The new XLGMC-1001 comes in slim 1U package form factor which is planed to be released in June of 2010 coinciding with the official release of 40 Gigabit Ethernet standard.
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[...] Hitachi Cable made an announcement on development of high power red LED featuring a maximum luminous flux of 55 lumens, which was achieved through increase of LED size and use of a fine line electrode structure. The development of new red LED was in direct response to market demand for higher luminous efficiency LED chips. On way to increase the light output per chip is by increasing its size, however larger chips increases the difficulty of distributing a uniform current across the entire light emitting layer. At the same time by placing large electrodes in the upper layer of the chip for a more uniform current dispersion will cause light form the light emitting layer to be blocked, reducing the light extraction efficiency. TO resolve this issue , Hitachi Cable instead of using larger electrodes, has utilized two pad electrodes for receiving power, a backbone electrode connecting the two electrodes as well as multiple fine line electrodes that extend from the backbone electrode on the upper chip layer. Through this, the company has succeeded in achieving uniform dispersion of current across the entire chip surface without blocking any lights form the light emitting layer resulting in maximum luminous flux of 55 lumens in a 1mm X 1mm size LED chip. The new chip is targeted to be used in light source application for such devices as projectors. source Share and Enjoy: [...]