Fujitsu, NTT and NEC Launch Joint R&D for World’s Top-Level, 400Gbps-class Optical Transmissions Technology

  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 -

Business Wire

TOKYO -- December 11, 2012

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.”

1. Background

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.

2. 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.

3. 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.

Glossary and Notes

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


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 (phase).

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

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

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

About NTT

NTT Group is the largest provider of wireline and wireless voice, data, leased
circuit, telecommunications equipment, and system integration services in
Japan, and operates one of the largest telephone networks in the world. Its
predominant business is to provide nation-wide telecommunications services.

NTT Group’s business domain consists of five primary lines of business:
regional communications business, long distance and international
communications business, mobile communications business, data communications
business, and other business.

NTT Group reported consolidated revenues of 10.5 trillion yen (US$130billion)
for the fiscal year ended March 31, 2012. Over 220,000 NTT Group people
support customers in more than 100 countries. For more information, please see

About NEC

NEC Corporation 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

Trademark Notice

All company or product names mentioned herein are trademarks or registered
trademarks of their respective owners. Information provided in this press
release is accurate at time of publication and is subject to change without
advance notice.

Photos/Multimedia Gallery Available:



Fujitsu Network Communications
Katie Caballero, 972-479-2526
Fujitsu Limited
Public and Investor Relations Division
Nippon Telegraph and Telephone Corporation
Science and Core Technology Laboratory Group, Public Relations
NEC Corporation
Joseph Jasper, +81-3-3798-6511
Press spacebar to pause and continue. Press esc to stop.