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Wednesday, January 11, 2012
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NEC Demonstrates Terabit/s Superchannel Transmission
over 10,000km
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NEC has announced the successful experimental
demonstration of 1.15-Tb/s ultra-long haul optical
transmission over 10,000 kilometers using optical
superchannel technology.
This is the first instance that a terabit/s channel
generated from a single laser source has been
transmitted over such a distance. Four superchannels
were transmitted together by wavelength division
multiplexing (WDM) to achieve a total capacity of 4
Tb/s and a spectral efficiency of 3.6 b/s/Hz. The
results demonstrate that practical high-capacity
transmission for transoceanic communication can be
achieved using the superchannel technology.
Optical superchannels allow phase-locked carriers with
independent modulation to overlap in frequency
following the principles of orthogonal frequency
division multiplexing (OFDM). This enables efficient
bandwidth utilization, allowing higher spectral
efficiency and higher data rate per laser through
parallelization. NEC's system uses hardware and
advanced techniques, including optical multi-tone
generation, large-core/ultra low-loss fiber, intradyne
digital coherent detection, and digital equalization
at higher oversampling, along with well-established
technologies such as EDFAs and DP-QPSK modulation. NEC
said that its experiment yielded a 2-dB system margin
above the hard decision FEC threshold without using
processing-intensive MAP or MLSE algorithms.
"This success is another example of NEC's continuing
leadership in high capacity, long distance optical
communication technologies, following its record
achievements of 101.7 Tb/s per fiber for single core
fiber transmission, the first terabit field trial with
coexisting 100G, 450G and 1T signals on the same
fiber, and the highest order QAM optical transmission
of 1024QAM" confirmed Dr. Yasuhiro Aoki, General
Manager for NEC's Submarine Network business. |
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