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Access Network Service Systems Laboratories

Overview of the Laboratories

The NTT Access Network Service Systems Laboratories have the mission of realizing a rich and diverse society by translating cutting-edge research to practical development in a timely manner and continuing to create new services. With this mission, we are carrying out research and development of optical access technologies that connect customers and NTT network buildings.


Vice President Yuji Aoyagi

Vice President Yuji Aoyagi

In recent years, broadband services have become essential services at all times, in all places, and for all people. This is due to the rapid spread of social networking services, cloud services, and IoT. From here on, even more services will be created. Delivering them to customers without delay will be even more necessary than today.

Access networks must therefore evolve into networks that can provide rich and diverse services with sufficient quality and enough flexibility to tolerate changes.

At the same time, to ensure reliability as social infrastructure and to continue to provide safe and secure services, maintenance and operation of access networks must become more sophisticated and improve in efficiency.

Toward this end, we at the NTT Access Network Service Systems Laboratories are engaged in a variety of R&D efforts to support existing access networks and create future access networks. These R&D efforts include

- Access System technology, which makes possible flexible optical services and smart operations;
- Optical Media Network technology, which overcomes limits in existing optical fiber and realizes highly available, flexible access networks;
- Infrastructure technology, which makes possible efficient maintenance and operation of infrastructure such as underground pipes and cable tunnels.
- And Wireless Access technology, which provides seamless access to all devices and lines and brings advances to the unlicensed frequency band wireless communication.

We are also actively participating in the standardization of Japan's optical access technologies to support their global expansion.

Through these research and development activities, we at the NTT Access Network Service Systems Laboratories provide access networks that naturally connect anyone, any time, without any special effort on their part. Along with advancing the NTT Group's own digital transformation, we are contributing to solving social challenges by helping our partners with their digital transformation.


  • · Access Network Service Systems Project
  • Establishing access services and network strategies and R&D to realize them.
  • · Optical Access Systems Project
  • Access network-related R&D
  • · Wireless Access Systems Project
  • R&D of last-hop wireless access, with emphasis on WiFi
  • · Wireless Entrance Systems Project
  • R&D of entrance access systems for wireless base stations
  • · Access Network Management Project
  • R&D of maintenance and operation of network facilities
  • · Access Network Media Project
  • R&D of optical fiber facilities and their construction
  • · Civil Engineering Project
  • Infrastructure (civil engineering)-related R&D
  • · Access Network Operation Project
  • R&D of operations and network operation support systems

Main Research Areas

1. Access system

Further enhancement of FTTH

We are enhancing optical access systems, such as GE-PON and WDM, to achieve high speed optical access services at rates of several hundred Mbps to several Gbps on existing optical fiber facilities. In addition, we are working on technology to provide a broad range of values of quality (QoS) using bandwidth control, and on a new service that will carry multi-channel videos and IP communication signals on a single optical fiber.

2. Optical media network

Technologies for the responsive, mass provisioning of a large number of services and for the efficient operation and maintenance of widespread optical facilities, with a view to providing 20 million customers with optical access.

We are advancing R&D into technologies to allow us to respond promptly to a large number of requests for the provisioning of optical broadband access services, and to produce simple, easy-to-handle and convenient optical fiber cables, with a view to meeting NTT's stated goal of ?gproviding 20 million customers with optical access?h. We are also working very actively on operation and management support systems, to achieve the efficient operation, management and maintenance of widespread and extensive optical facilities, so that these will serve as a highly reliable social infrastructure and provide stable quality while requiring a minimum of human intervention and maintenance cost. Optical media network

3. Infrastructure technology

Ensure reliable and safe cable hold space

Underground and other telecommunication facilities are requested to contribute to carry on telecommunication service as a lifeline and to ensure reliability of the network. Even as these facilities continue to age, it is also necessary to contribute to migration from metal to optical cables, prolong facility life-span by suitable maintenance, and reduce cost by managing huge volume facility. To achieve these goals, our R&D themes are as follows. (1) Research on economic and work efficiency of conduit facility operation by maintenance-free technologies for repair and renewal. (2) Research on maintenance technologies of concrete structures, such as manholes. (3) Research on cost reduction by optimizing facility management and operation.

4. Wireless access

Expand the Use Scene of Wireless Communications

Because of portability of terminals, flexibility in installation, and cost effectiveness, wireless technology is extremely important in providing a broad range of services. Specifically, we are developing: (1) Fixed wireless access (FWA) systems, which allow high-speed IP access services as an alternative to optical fibers, using wireless equipment attached to a fixed structure; (2) Nomadic wireless access (NWA) systems, which allow high-speed Internet access from home, office or public places using wireless LANs; and (3) satellite communication systems, which allow high-speed Internet access on trains and ships moving over long distances, and allow telecommunications services to be provided to isolated islands and disaster area.

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