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Access Network Service Systems Laboratories

Overview of the Laboratories

Access Network Service Systems Laboratories are undertaking R&D into access networks, which link customers to NTT central offices. Specifically, our wide range of R&D topics includes the enhancement of optical access systems to enable high-speed optical access services, the enhancement of operation systems to support widespread optical access services, and technologies to allow prompt bulk provisioning of optical broadband services, as well as technology to produce simple, easy-to-handle and convenient optical fiber cables, to provide seamless means of access using wireless access technology, and to reduce the cost of cables, conduits and other infrastructure facilities. In addition, the Laboratories are working on a new service that will deliver multi-channel videos and IP communication signals over a single optical fiber.


Vice President Masaki Kobayashi

Vice President Masaki Kobayashi

Access Service Systems Laboratories are working on R&D to help to create and enlarge a new access service and a high-speed access network infrastructure that will ensure ubiquitous broadband communication. Our wide range of R&D topics includes an enhanced optical access system, which will enable us to realize a high-speed optical service, the enhancement of the system that helps spread the optical service, technical inspection including effective service delivery, the maintenance and operation of various optical broadband services, the development of optical fiber cable that is easy and convenient for everyone to use, the provision of flexible and seamless wireless access and communication infrastructure equipment such as underground conduits and cable tunnels. Moreover, we pursue our R&D to make it possible to continue using broadband services under pleasant conditions. In addition, it is important that we maintain the access network equipment, which is expanding massively with a broad range. We also consult on the globalization of optical access system technology developed in Japan, which has become the world's leading FTTH country.


  • · Access Network Service Systems Project
  • · Optical Access Systems Project
  • · Access Media Project
  • · Optical Access Network Project
  • · Wireless Access Systems Project
  • · Wireless Entrance Systems Project
  • · Civil Engineering Project
  • · Access Network Operation Project

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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