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Optoelectronics/Displays??

Optical transceiver ups GPON performance

Posted: 24 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:transceivers? GPON? CMOS? Fujitsu? optical line terminal?

Fujitsu's <a href=optical transceiver for GPON" ALIGN="RIGHT">

Fujitsu Ltd and Fujitsu Laboratories Ltd have announced the development of optical transceivers capable of operating across a temperature range of -40C to 85C. These devices, which can also receive burst signals widely with varying optical power, are designed for application in Gigabit passive optical networking (GPON) systems to enable high-speed broadband access.

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.

Broadband demand
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.

Fiber-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 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.

GPON standard
The new 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 performance improvements enable GPON deployments supporting more than 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 -40C to 85C, which make them suited for installation in demanding outdoor environments. These products are roughly 20 percent smaller than existing optical transceivers in the SFP format. They also ease maintenance or expansion of networks without disrupting existing services.

Fujitsu plans to begin sales of two optical transceiver products for Optical Line Terminal (OLT) systems in SFP and SFF formats at the end of April 2007.




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