Fujitsu, NTT and NEC Launch Joint R&D for World's Top-Level, 400

Fujitsu, NTT and NEC Launch Joint R&D for World's Top-Level, 400Gbps-class
Optical Transmissions Technology 
To deliver optical networks that are both energy efficient and flexible 
Tokyo, Dec 11, 2012 - (JCN Newswire) - Fujitsu Limited (Fujitsu), Nippon
Telegraph and Telephone Corporation (NTT) and NEC Corporation (NEC) today
announced the commencement of joint research and development toward making the
world's top-level,400Gbps/channel-class digital coherent optical
transmissions technology(1). Bringing together the technological capabilities
that have enabled the commercialization of 100Gbps-class optical transmissions
methods, which are becoming more prevalent among the world's optical
networks, the companies will work to further enhance the performance and
functionality of the digital coherent optical transmissions method, a key
technology in optical transmissions. This enables the possibility of realizing
the world's top-level optical networks that combine ultra-high speeds, low
energy consumption and flexibility, while also contributing to improvements in
optical transmissions technology and the global spread of the research results.
This R&D initiative was commissioned and is sponsored by Japan's
Ministry of Internal Affairs and Communications (MIC) as part of the
"Research and Development Project for the Ultra-high Speed and Green
Photonic Networks" program. 
"In 2012 the supply and demand of 100G products began to converge,
leading to significant growth in deployments. The demand for network
connectivity will only increase. Therefore, the need for 400G solutions that
provide even greater bandwidth with the lowest possible power consumption and
flexible, adaptive modulation will be critical," noted industry analyst
Dana Cooperson, VP Network Infrastructure, Ovum, Inc. "Fujitsu, NTT and
NEC's collaborative efforts to meet this growing demand illustrate
what's possible when key industry players work together. Carriers,
enterprises, governments, and others would be wise to look closely at this
solution as they evolve their networks." 
To accommodate the explosive growth in data communications traffic stemming
from the spread of the Internet and smartphones in recent years, 100Gbps-class
optical transmission methods are starting to become more practical. At the same
time, with the arrival of the big data era, along with a surge in the diversity
of data due to the spread of machine-to-machine communications, customer
expectations with regard to speed and service continue to grow. Not only will
data traffic in the near future grow at a rapid pace, but networks will also
experience extremely large fluctuations in communications traffic, thereby
resulting in a need to build flexible network infrastructure that can withstand
such demand. 
To address these impending challenges, core optical networks will require even
greater speeds. With existing optical transmission technology, however, it is
difficult to ensure the optical transmission performance needed to meet this
demand for higher speeds. Moreover, existing communications equipment consumes
a substantially higher amount of power in proportion to the amount of data
transmitted. To enable high-capacity optical transmissions using relatively low
power, a new optical transmissions solution is needed. 
Building a flexible network architecture requires the ability to adapt, in
real-time, to changes in data volumes and transmission distances. Therefore,
great demand exists for the construction of highly flexible networks that can
support regional differences in network architectures with a single core
To meet these challenges, the three companies are aiming to build flexible,
low-power networks in an effort to bring about a comfortable, eco-friendly
society. As such, they are commencing research and development directed at
implementing the core technologies required for these networks. 
Joint Research and Development Program 
Fujitsu, NTT and NEC have pursued R&D on 100Gbps-class digital coherent
optical communications technology as part of the MIC's "Research and
Development on High Speed Optical Transport System Technologies" program
(2009) and "Research and Development on Ultra-high Speed Optical Edge Node
Technologies" program (2010-2011). The digital coherent DSP-LSI(2) that
was commercialized in 2012 as a result of these programs currently holds the
world's top market share. Moreover, the achievements of these development
initiatives are currently being deployed by each company as part of a global
roll-out to optical networks throughout the world. 
In order to once again leverage the three companies' technologies and
teamwork to bring about even greater capacity optical transmissions with lower
energy consumption, the companies will be working under the support of the
MIC's "Research and Development Project for the Ultra-high Speed and
Green Photonic Networks" to accelerate R&D on element technologies
aimed at making practical 400Gbps-class optical transmissions. 
The joint research will enable ultra-high-speed 400Gbps-class optical
transmissions through the use of dual-polarization quadrature phase shift
keying (DP-QPSK)(3), which is currently in use for 100Gbps transmissions,
together with dual-polarization 16 quadrature amplitude modulation
(DP-16QAM)(4), which takes advantage of an even greater number of quadrature
carriers. By incorporating these modulation techniques into a high-density
60-channel fiber, the technology will be able to bring about the world's
highest capacity optical networks capable of 24Tbps/fiber-class transmissions.
In addition, to cut down on power consumption, long-haul transmission
technology that can lead to reductions in the number of devices is required. 
In light of this, the companies aim to provide the world's first
compensation technology for nonlinear optical effects(5) within an optical
fiber - the primary limiting factor standing in the way of long-distance
transmission of multiple quadrature modulated signals. When employed together
with enhanced-performance versions of existing compensation technologies for
chromatic dispersion(6) and polarization mode dispersion(7), the new technology
will achieve longer transmission distances. Furthermore, the companies will
pursue the implementation of adaptive modulation/demodulation(8) technology
that can employ a host of modulation techniques depending on the transmission
route using a single hardware device, thereby leading to the construction of
flexible network architecture. 
Through the new project, the companies will enable the following kinds of
next-generation optical network capabilities by 2014: 
1. Ultra-high-speed and high-capacity optical transmissions -
400Gbps/channel-class and 24Tbps/fiber 
2. Compensation for chromatic dispersion, polarization mode dispersion and
nonlinear effects occurring on a fiber-optic line, all of which are factors
that lead to performance deterioration. This results in improved optical reach
(greater than 2 times that of existing technologies). 
3. A substantial reduction in network power consumption (less than half of
existing technologies) as a result of the need for fewer devices. 
4. The construction of flexible networks through adaptive
modulation/demodulation using a single hardware device. 
Future Development 
Going forward, the companies will work until 2014 to address the
aforementioned technological challenges throughout the term of the R&D
project. As such, they will develop technologies pertaining to 400Gbps-class
transmissions and low power consumption, while striving to quickly make
available the results of these efforts. In addition, they will collaborate with
institutions inside and outside Japan in an aim to deploy their achievements on
a global scale. 
(1) Digital coherent optical transmission technology: A next-generation
optical transmission method that combines coherent reception and digital signal
processing. In addition to streamlining frequency usage through modulation
methods such as polarization wave multiplexing and phase modulation, the
technology enables significant improvements in reception sensitivity.
(2) DSP-LSI: Digital Signal Processing LSI. A signal processing method for
converting analog data to digital data.
(3) Dual-polarization quadrature phase shift keying: A technique in which
information is conveyed through an optical wave's oscillation timing
(4) Quadrature amplitude modulation: A technique in which information is
conveyed through both an optical wave's amplitude and phase.
(5) Nonlinear optical effects: A phenomenon in which the optical fiber's
refractive index changes in response to the light's intensity.
(6) Chromatic dispersion: A phenomenon in which different wavelengths are
transmitted at different speeds within an optical fiber.
(7) Polarization mode dispersion: A phenomenon that causes differences in
transmission delay times within optical fibers due to polarization (direction
of vibrations in the electrical field).
(8) Adaptive modulation/demodulation: Technology that enables the efficient
operation of optical network resources through improved line quality by
switching to the optimal modulation/demodulation method depending on the
characteristics of the optical network. 
About Fujitsu Limited 
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 
About NEC Corporation 
NEC Corporation (TSE: 6701) is a leader in the integration of IT and network
technologies that benefit businesses and people around the world. By providing
a combination of products and solutions that cross utilize the company's
experience and global resources, NEC's advanced technologies meet the
complex and ever-changing needs of its customers. NEC brings more than 100
years of expertise in technological innovation to empower people, businesses
and society. For more information, visit NEC at 
About NTT 
Nippon Telegraph and Telephone Corporation (TSE: 9432; NYSE: NTT) was
established in 1952 as a state-owned telecommunications public corporation and
in 1986 converted to a private company to be the largest telecommunications
company in Japan and the second largest in the world. NTT and its 430 group
companies provide a wide range of telecommunications services. One of the
important missions of NTT group is to contribute to the achievement of a
Ubiquitous Broadband society. For more information, please visit 
Fujitsu Limited
Public and Investor Relations
Nippon Telegraph and Telephone Corporation
Science and Core Technology Laboratory Group, Public Relations
Joseph Jasper
NEC Corporation
Tel: +81-3-3798-6511
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