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OKI Builds Virtual Network for 100-km Broadband Optical Access Service Demonstration

Develops optical access networking technologies providing low-cost and high-speed broadband to help bridge digital divide

TOKYO, March 12, 2012 -- OKI (TSE:6703) today announced the development of an adaptive network configuration technology and success in channel-switching between current GE-PON(*1) systems and the 10 GE-PON(*2) system, next generation high-capacity optical access. Based on improved functionality in optical line terminals and optical network units, the breakthrough results in a flexible, low-cost optical access system for subscription-based 100-km broadband optical networks.

Despite the rapid advance of FTTH (Fiber-To-The-Home), optical access systems based on current GE-PON systems provide a service range limited to 20 km. Expanding this requires the installation of numerous center offices and the corresponding capital investment, creating a "digital divide" in underperforming areas and sparsely populated regions, restricting users access to high-speed broadband. Demand has also emerged in the area of subscription-based optical networks for the high adaptability required to respond flexibly to a growing subscriber base, as well as for various services and variable transmission capacity.

To address these issues, The National Institute of Information and Communications Technology (NICT; an independent administrative institution) in 2009 commissioned OKI to initiate research on subscription-based broadband optical network technologies that would enable broadband services without installing new center offices, based on virtualized connections between optical line terminals and optical network units. With support from NIPPON TELEGRAPH AND TELEPHONE CORPORATION, OKI connected NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION's buildings (in Sapporo, Eniwa, and Chitose in Hokkaido) with optical fiber, demonstrating the feasibility of a flexible optical access network in a testbed simulating a total transmission distance of 100 km for subscription-based broad optical networks.

"The adaptive network configuration technology developed by OKI combines OKI's unique optical hybrid filtering (OHF(*3)) and adaptive networking technologies for flexible connections between OLT and ONU," says Takeshi Kamijoh, General Manager of Research and Development Center at OKI. "In addition to wavelength-division multiplexing (WDM) used for metro-core networks, OHF realizes multiple expansion technology that enables ‘add/drop’ from 160ch multiple signals by adding optical code division multiplexing (OCDM) technology, achieving filters with low transmission loss."

Adaptive networking builds network infrastructure in a ring or cascade form by using centralized control node and passive OHF for the PON system, which was conventionally branched by power splitters. This enables broadband technology with lowed loss resulting from branching. Centralized control nodes switch WDM and OCDM channel allocating, realizing virtual technology in a logical star form without depending on physical connection of OLT and ONU.

This experiment demonstrates the transmission of WDM and OCDM hybrid optical signals, restoration via passive routing, and service provisioning from GE-PON to 10G-EPON without obstacles to other users.

Moving forward, OKI will continue to develop multi-channel control and OLT driving control technologies to offer more efficiency and build virtualized access system technology by combining this adaptive networking technology for an early practical realization for virtual PON system.

Overview of adaptive networking technology


  • *1 :GE-PON (Gigabit Ethernet Passive Optical Network)

    Refers to a 1 Gbps passive optical network (PON) system based on Ethernet frames; described under the IEEE802.3ah standard.

  • *2 :10 G-EPON (10 Gigabit Ethernet Passive Optical Network)

    Refers to a 10 Gbps PON system based on Ethernet frames currently being developed by various manufacturers; described under the IEEE 802.3av standard.

  • *3 :OHF (Optical Hybrid Filter)

    Refers to a filter capable of handling both WDM and OCDM signals.

About OKI Electric Industry (OKI)

Founded in 1881, OKI Electric Industry is Japan's leading telecommunications manufacturer. Headquartered in Tokyo, Japan, OKI provides top-quality products, technologies, and solutions to customers through its info-telecom systems and printer operations. Its various business divisions function synergistically to bring to market exciting new products and technologies that meet a wide range of customer needs in various sectors. Visit OKI's global website at http://www.oki.com/.

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Phone: +81-3-3501-3835
  • * Information in the press releases is current on the date of the press announcement, but is subject to change without prior notice.

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