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areas for Research & Development

  Packet-Optical Integrated flow Switching Technology

Multi-hop routing based current Internet has fundamental limitations for the evolution towards large scale, high bandwidth premium All-IP services future network. Ever increasing CAPEX & OPEX due to the inefficient network architecture, i.e., multi-staged aggregation and multi-layered transport network, has been a major problem for the network service providers to introduce premium All-IP services new network infrastructure. Packet-Optical Integrated flow Switching Technology will provide a breakthrough to realize the future network evolution by enabling:

• cut-through path for seamless premium IP services and leased line circuit services
• dynamic provision of integrated L0/L1/L2/L3 paths
• reduction of CAPEX & OPEX by simplifying aggregation and layered transport networks
• highly reliable, scalable, and manageable QoS paths.

  Multi-Layer Optical Network Control Platform Technology

We are developing a new technology for the integrated control platform which controls network switches in order to deliver high-quality IP premium service traffic over the Packet-Optic network. Using this technology, we can transport broadband IP premium service traffic, such as an IPTV service, directly via an edge-to-edge PTL (Packet Transport Layer) cut-through path at optical transport network without multi-hop routing at IP network. For this, we have a goal that developing core technologies to control multi-layer (L0/L1/L1.5/L3/Session) network resources and paths in a consistent and integrated manner.

To restructure the current network, which heavily dependent on the highly costly backbone routers of foreign vendors, more efficient and cost effective way, it is needed to develop an epochal packet-optic integrated network devices and efficient network/traffic control technologies, which can provide QoS-guaranteed IP premium services to the users with reasonable price and provide more effective and economical way to operate and manage network to the operators.
For this, we are doing R&D on multi-layer optical network control platform technologies which are combining optical network control technology with IP packet control technology to build a control platform for the incoming NGN and future internet. We are not only trying to acquire intellectual properties but also actively contributing the results to the ITU-T international standardization meetings.

  100Gb/s Ethernet and Optical Transmission Technology

The rapid progress in optical transmission technology has been supporting the ever increasing transmission traffic. Especially, WDM technology, which was utilized at the end of last century, played a major role. However, new technologies are needed to harness the exponentially increasing data traffic.
A solution is 100Gb/s transmission. IEEE will soon announce 40G/100G Ethernet standard and ITU-T has prepared OTN standard to accommodate 100G signals in DWDM backbone network.
In the transmission market, 10Gb/s already dominated 2.5Gb/s and now 40Gb/s portion is notably increasing. Commercializing 100Gb/s is a very challenging task.
There are still many technological problems to be solved, not to mention the cost. Still, nobody could deny that the deployment of 100Gb/s in DWDM backbone and metro network will be realized in near future. Already technologies beyond 100G are started being discussed.

ETRI has more than thirty years' experience in optical transmission area. WDM, 10Gb/s and 40Gb/s technologies have been developed and transferred to industries. High Speed Ethernet is another major area. Based on the accumulated IPR and know-how, 40G and 100G modules for Ethernet and DWDM are being developed for the market next corner.

  Next Generation WDM-PON Technology

A wavelength division multiplexing-passive optical network (WDM-PON) is promising technology to provide broadband access offering optic-wireless converged next generation multi-application service with highest quality. The WDM-PON has many merits.

• Utilizes multiple wavelengths on a single fiber, each of which carries transmission bandwidth up to 10Gb/s at the maximum. So, the WDM-PON can reduce the optical access infrastructure.
• Suitable for long reach application and possible to achieve OPEX reduction
• Provides co-existence with the Legacy TDM-PON (EPON, and GPON) systems and pay-as-you-grow upgradability.
• Distinctive merits of so called protocol transparency, meaning that it requires no specific transmission protocol, and physical layer security, beside the scalability in bandwidth increase and guarantee of quality of service based on bandwidth abundance.

ETRI has developed state-of-art WDM-PON technologies including a wavelength reused WDM-PON, a long-reach WDM/TDM hybrid PON and a tunable WDM-PON. The developed 1Gb/s and 2.5Gb/s WDM-PON systems were successfully commercialized in Korea. The Giga Ethernet WDM-PON system and WDM and TDMA hybrid PON system has been under commercial service since April, 2008.

Based on the experience, ETRI has been performing R&D on tunable 10Gb/s WDM-PON related technologies and WDM-PON standardization for fully complying with these world-wide trends.