[LINK] 640Gbps over fiber-optic with no errors
stephen at melbpc.org.au
stephen at melbpc.org.au
Wed Apr 15 18:50:14 AEST 2009
. In a paper published in the Feb 16th edition of Optics Express,
researchers detail their approach for de-multiplexing signals at high
speeds, claiming that they were able to achieve 640Gbps over fiber-optic
lines with no errors.
The material they used in the chip is chalcogenide, and Australian
researchers were talking about the high-speed networking possibilities of
the material last summer.
Calling it "just a piece of scratched glass," they said it could
potentially be cheap to produce.
At these bit rates, the researchers say that it is only possible to
perform switching with an all-optical system, using optical time-division
multiplexing. And chalcogenide allows for "femtosecond response time".
Recently, Sreedhar Kajeepeta, a CTO at CSC, wrote about how a Terabit
Ethernet could be used.
Presumably, it would not just be used for aggregating lower-speed links,
but would inspire us to reach higher, to new applications, perhaps to
something called Augmented Reality. That application is where real-life
video and audio are combined with virtual video and audio.
By Sreedhar Kajeepeta , Network World , 03/30/2009
Looking down the LAN road, the Terabit Ethernet milestone is very much in
While 3.2Tbps and 6.4Tbps speeds were demonstrated in test environments
by Siemens/WorldCom and NEC/Nortel respectively starting in 2001, the
first set of viable solutions are just now taking shape.
The Feb. 16th edition of Optics Express included a paper detailing the
efforts of researchers from Australia, Denmark and China who joined
forces to demonstrate the feasibility of a Terabit Ethernet over regular
fiber-optic cables. Terabit speeds bring us to the x1Million improvement
in speed from where Ethernet started in 1976.
By focusing on materials research related to fiber-optic circuits,
Australia's Center for Ultra-high bandwidth Device for Optical Systems
(CUDOS) achieved a breakthrough with the introduction of an exotic
compound called "Chalcogenide" that could make commercializing Terabit
Although CUDOS Research Director Ben Eggleton says it will take years to
reach production readiness, this does coincide with Bob Metcalfe's
prediction that we may start seeing the first commercial use of Terabit
Ethernets by 2015.
Today, of course, the industry is focused on shorter-term goals.
The IEEE 802.3ba is working on 40GbE and 100GbE standards, and NTT is the
first company to announce a reliable 100GbE circuit. But many network
vendors are focusing on 10GbE, in particular, development of cost-
effective 10GbE interfaces for copper so buyers don't have to upgrade to
>From their debut in 2001, 10GbE switches have indeed become more
affordable, dropping from about $40,000 to $4,000. Industry analysts
expect 10GbE adoption to jump 30% this year.
Most campus LANs are getting by with speeds of 100Mbps, but there are
examples of 1GbE and 10GbE switches at the server and backbone layers,
and also the use of fiber-optics between servers. And most laptops ship
with an Ethernet card capable of handling 1Gbps or even 10Gbps..
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