Oooo, gimme, gimme, gimme....
Alcatel-Lucent(Euronext Paris and NYSE: ALU) today announced in a post deadline paper
accepted at the OFC/NFOEC conference in Anaheim, California, that combined
research teams from the United States and France successfully transmitted a
world record 25.6 Terabits per second (Tb/s) of optical data over a single
fiber strand, using 160 Wavelength-Division Multiplexed (WDM) channels -
enough bandwidth to transmit the data from more 600 DVDs per second.
[Editor's note: A terabit is a trillion bits of data.]
These results far surpass the previous transmission record of 14 Tb/s,
established in September 2006.
Alcatel-Lucent was able to leverage its researchers' skill in
optimizing spectral efficiency in optical networks, using both wavelength
and polarization multiplexing, and general mastery of the physical layer of
optical networking. Also involved in this experiment were scientists from
the National Institute of Information and Communications Technologies in
Tokyo (NTIICT), and also from Sumitomo Osaka Cement in Chiba, Japan.
This breakthrough in data transmission capacity adds to the company's
long list of terrestrial and submarine optical networking research
milestones including the world's first terabit transmission experiment,
invention of non-zero dispersion fiber (NZDF), the first to break the 10
Tbit/s barrier for delivering data over a single optical fiber, the largest
capacity ever transported over transoceanic distances (6Tbit/s),
transmission of 100 Gbit/s data over 2,000 km, introduction of the L-Band
amplifier, the first large-effective area fiber, and the first commercial
all-Raman amplified DWDM system.
"Optical networking is a critical enabler of the broadband IP
revolution we are seeing throughout the world today," said Romano Valussi,
President of Alcatel-Lucent's Optics activities. "The experience we are
developing in these tests will help Alcatel-Lucent design the most
efficient, highest bandwidth systems possible to benefit our customers when
networks of this bandwidth will be deployed."
The experimental system transmitted 25.6Tbit/s of data through three
80-km spans. The data used wavelength division multiplexing in both the
C(conventional) and L(long) wavelength bands and, to double the total
capacity, polarization multiplexing in each wavelength was employed.
Distributed Raman amplification was used to increase the received optical
signal-to-noise ratio and to allow the use of a single
dispersion-compensating fiber for both bands after each span.
Maximizing spectral efficiency, which is the amount of information that
can be transmitted within a unit bandwidth, was also critical to realizing
this world record. In this experiment Alcatel-Lucent's Bell Labs
researchers in New Jersey and Alcatel-Lucent's Research and Innovation
researchers in France used an advanced signalling format called RZ-DQPSK
(return to zero differential quadrature phase-shift keyed) to realize a
record-breaking 3.2 bits/second/Hertz (b/s/Hz) of spectral efficiency. This
is a significant improvement over today's commercial systems that generally
operate at spectral efficiencies of between 0.2 and 0.4 b/s/Hz.