Sumitomo Electric Industries Ltd, a leader in optical solutions, has announced that it is expanding its 10 Gbps portfolio with the introduction of an integrated direct modulation laser diode (DML) and a built-in electronic dispersion compensation (EDC) feature for use in 80 km transceivers.
Sumitomo Electric unveiled its 10G transceiver portfolio at the 34th European Conference and Exhibition on Optical Communication (ECOC 2008) held in Brussels in September.
Previously DMLs were used in transceivers up to data rates of 2.5 Gbps. At 10 Gbps ZR applications, DMLs were not a reliable light source because transmission distance was limited by chromatic dispersion due to optical spectrum chirping. As a result, light sources such as those combined with an expensive external modulation laser diode (EML) had to be used for this application.
“This design is the first product to integrate a DML and an EDC circuit internally to the transceiver. By providing improved chirp characteristics in the DML and combining it with a receiver having a built-in EDC capability, this product offers a low-cost integrated solution for long-distance applications,” a Sumitomo statement said.
“This combination enables 10 Gbps transmission over 80 km using a low-cost DML and benefits system designers by eliminating an external modulator and wasted board space. Another key design feature, in addition to enhanced packaging, is that EDC is based on the maximum likelihood sequence estimation (MLSE) technique. The EDC circuit has not only an electronic dispersion compensation function, but also a digital signal processing function.”
Terry Fujitani, head of the lightwave technologies department of Sumitomo Electric, remarked: “We are very pleased with our continued advancements in 10 Gbps long-reach packaging. Sumitomo Electric’s DML technology has been tested with the performance of MLSE PHY. Together these technologies provide a very compelling value proposition to the optical networking market.”
Sumitomo Electric plans to launch 10 Gbps transceivers such as X2, XFP, and SFP+ using this technology in the market beginning in 2009. Sumitomo Electric demonstrated this new 10 Gbps technology at ECOC 2008.
Sumitomo Electric designs, manufactures and sells optical fibre, cable and components, advanced electronic devices, and automotive parts.
