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Fujitsu optical transceivers suit GPON systems

Posted: 23 Jan 2007     Print Version  Bookmark and Share

Keywords:Fujitsu  optical transceiver  Gigabit Passive Optical Networking  GPON  Optical Line Terminal 

Fujitsu Ltd and Fujitsu Laboratories Ltd. have announced the development of the first optical transceiver technology capable of operating across a temperature range of -40°C (-40°F) to 85°C (185°F). These devices, which can also receive burst signals widely with varying optical power, are designed for application in Gigabit Passive Optical Networking (GPON) systems that are being deployed primarily in North America to enable high speed broadband access.

Fujitsu plans to begin sales of two optical transceiver products for Optical Line Terminal (OLT) systems based on this new technology in SFP and SFF formats at the end of April 2007. These products will ensure system margins that tolerate wide variations in the received optical power, resulting in dramatic improvements in optical transmission performance and enabling GPON equipment to be much more compact. These features, in turn, enable much greater flexibility in network deployments.

With ever-increasing demand for broadband access bandwidth on both backbone networks and residential networks, there is a strong need for optical transceivers that can support highly-reliable, high-capacity networks capable of delivering a wide range of applications.

Fibre-optic lines are being deployed in residential networks to support subscribers' increasing bandwidth requirements. These lines initially supported transmission speeds of 150Mbps, but currently offer gigabit-level speeds. In North America, the ITU-T GPON standard is viewed as a likely candidate for its affinity to existing SONET networks, with demand expected to rise considerably. In a GPON network, the central office equipment is connected to subscriber premises via a star coupler, receiving subscriber signals with time-division multiplexing. Because distances to subscriber premises will vary, the central office equipment must be able to receive burst signals that vary in the received optical powers by a factor of up to 100 times.

These transceivers fully comply with ITU-T G.984.2 Class B+, the standard for GPON, with support for separate upstream and downstream signal frequencies.

Fujitsu's proprietary CMOS chip and burst-reception technology allow for incoming signals with received optical powers that vary by more than 1000 times. These transceiver performance improvements enable GPON deployments supporting more than the type 32 subscribers per port and at longer distances than the industry standard 20km.

High-efficiency heat-dissipation construction and control circuitry for stable operation over a wide temperature range mean these transceivers can operate reliably at temperatures from -40°C (-40°F ) to 85°C (185°F), which make them well-suited for installation in demanding outdoor environments.

Fujitsu's proprietary compact device technologies and high-density mounting technologies result in a product roughly 20 per cent smaller than existing optical transceivers in the SFP format. These devices will make it easier to maintain or expand networks without disrupting existing services.

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