March 14, 2012
OKI Develops Optical Access Networking Technologies for 100-km Broadband Optical Access Service Demonstration
By Jayashree Adkoli
Japan's telecommunications manufacturer, OKI (News - Alert) Electric Industry Co., Ltd., recently announced that it has built a virtual network for the demonstration of 100-km broadband optical access service.
Precisely, the company developed an adaptive network configuration technology and succeeded in channel-switching between current Gigabit Ethernet Passive Optical Network (GE-PON) systems and the 10 GE-PON systems. The GE-PON refers to a 1 Gbps passive optical network (PON) system based on Ethernet frames as described under the IEEE802.3ah standard. The 10 G-EPON refers to a 10 Gbps PON system based on Ethernet frames currently being developed by various manufacturers as described under the IEEE (News - Alert) 802.3av standard.
With the improved functionality in optical line terminals and optical network units, the company was able to demonstrate a flexible, low-cost optical access system for subscription-based 100-km broadband optical networks.
“The adaptive network configuration technology developed by OKI combines OKI's unique optical hybrid filtering (OHF) and adaptive networking technologies for flexible connections between OLT and ONU,” said Takeshi Kamijoh, GM of research and development center at OKI, in a statement.
The OHF refers to a filter capable of handling both WDM and OCDM signals.
Kamijoh added, “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.”
Generally, optical access systems based on current GE-PON systems provide a service range limited to 20 km. In order to expand the range of connectivity, numerous center offices and the corresponding capital investment has to be installed. This creates a “digital divide” in underperforming areas and sparsely populated regions, thereby restricting users access to high-speed broadband.
To address these issues, the National Institute of Information and Communications Technology (NICT) - an independent administrative institution - commissioned OKI in 2009 to initiate research on subscription-based broadband optical network technologies. This eliminated the need to install new center offices, based on virtualized connections between optical line terminals and optical network units.
According to the source, OKI connected NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION's buildings (in Sapporo, Eniwa, and Chitose in Hokkaido) with optical fiber with support from both the firms.
Edited by Jennifer Russell
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