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Thread: Alcatel-Lucent Achieves a World Record 25.6 Terabit/s Optical Transmission

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    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.

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