- A first in Japan and a step toward commercial deployment of 100 Gbps
digital coherent optical transmission technology -
Tokyo, June 21, 2012 - Fujitsu today announced that it has worked with
NTT Communications Corporation to conduct a successful test of 100 Gbps
DWDM transmission using an advanced optical transmission technology
called "digital coherent transmission"(1) over a commercial fiber-optic
cable between Tokyo and Osaka, Japan's most heavily trafficked
communications corridor.
Having confirmed commercial-grade transmission quality, Fujitsu plans
to actively move forward with network construction using 100 Gbps DWDM
systems.
<1. Background>
With the spread of cloud services and the rapid uptake in smartphones
using advanced wireless communications, and as access-line capacity
increases, communications traffic is experiencing explosive growth.
Meanwhile, the impact of last year's Great East Japan Earthquake has
focused attention not only on increasing the capacity of core networks,
but also in improving their reliability and disaster tolerance.
Fujitsu has been developing 100 Gbps DWDM systems as a way to achieve
economical, high-capacity, high-quality advanced core networks. With NTT
Communications, it conducted a field test on the underlying technology,
100 Gbps digital coherent transmission.
<2. Test Overview>
Fujitsu has previously implemented 100 Gbps DWDM systems that use digital
coherent transmission technology at 100 Gbps per wavelength in markets
outside of Japan. Leveraging this expertise, Fujitsu and NTT
Communications conducted a field test of DWDM transmissions on a
commercial fiber-optic cable connecting Tokyo to Osaka. The test was
conducted using dispersion-shifted fiber in the L-band(2), which is often
used in Japan for long-haul transmissions (Figure 1).
In anticipation of the commercial deployment of 100 Gbps DWDM, the field
test simulated real-world situations, such as fiber-optic cable changes
in accordance with transmission-circuit route changes and adding/removing
wavelengths. The results confirmed that a quality sufficient for
commercial operation could be achieved at 8 Tbps (100 Gbps X 80
multiplexed wavelengths).
In addition, the test demonstrated that the system could compensate
automatically when adding chromatic dispersion and polarization mode
dispersion to actual transmission circuits, which could happen over a
variety of networks. This proved that it would be possible to have
operability with eased conditions of prior measurement of the fiber for
each individual network and design customization?which are characteristic
features of digital coherent transmission technology.
On December 14, 2011, Fujitsu announced the Packet Optical Networking
Platform for building ultra-fast, ultra-capacity 100 Gbps networks. Since
then, Fujitsu has continued to work on technologies that will bring more
capacity, more speed, and more energy efficiency to core optical networks
in Japan and around the world.
Digital coherent transmission technology makes use of results achieved in
two previous research projects, "R&D on High-speed Optical Transport
System Technologies" and "R&D on High-speed Edge Node Technologies," which
were supported by the Ministry of Internal Affairs and Communications.
<Glossary and Notes>
1 Digital coherent transmission technology:
An advanced optical transmission method that uses polarity multiplexing,
phase modulation, and other modulation techniques to increase frequency
utilization efficiency, and combines coherent reception and digital signal
processing to greatly increase reception sensitivity.
2 Dispersion-shifted fiber in L-band:
Dispersion-shifted fiber (DSF) is a type of single-mode optical fiber that
is tailored to shift the zero-dispersion wavelength from 1,310 nm to 1,550
nm, a wavelength in which the transmission loss is smaller. It is used in
long-haul transmissions. The L-band is the optical wavelength range of
1,565 nm to 1,625 nm used in WDM transmissions over DSF.
<About Fujitsu>
Fujitsu is the leading Japanese information and communication technology (ICT)
company offering a full range of technology products, solutions and services.
Over 170,000 Fujitsu people support customers in more than 100 countries. We
use our experience and the power of ICT to shape the future of society with our
customers. Fujitsu Limited (TSE:6702) reported consolidated revenues of 4.5
trillion yen (US$54 billion) for the fiscal year ended March 31, 2012. For more
information, please see http://www.fujitsu.com.
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