![]() Just how does an electronic dispersion compensation device stack up to an optical device? "You might use optical dispersion compensation for coarse-tuning and electronic for the fine-tuning," explains Tom Hausken, director of optical communications at market researcher Strategies Unlimited (Mountain View, CA). While Scintera is bullish about the benefits of electrical compensation, some of its competitors are pushing optical solutions. It too may be integrated with 300-pin transceivers and XENPAK, X2, XPAK, and XFP transponders. The SCN5028 EDCE doubles the usable distance of singlemode fiber it features an I2C interface for advanced channel monitoring and like the SCN3142, it is also housed in a 32-pin, 5×5-mm small-form-factor QFN package. "You tweak something, and you have to go out there and reengineer the whole link, get it back up and running, and make sure it meets the performance requirements. ![]() "The huge cost of deployment includes not only equipment, but also engineering the link, the service calls," explains Steven Kubes, Scintera's vice president of marketing and sales. Chromatic dispersion and polarization-mode dispersion can severely limit transmission distance, and the alternatives-installing dispersion compensating fiber or deploying amplifiers-are expensive. The legacy base in metro networks composes singlemode fiber, which is prone to equally disruptive dispersion problems at 10 Gbits/sec. "There's something magical about the 300-m number because it enables over 90% of the installed base, and the only solution available today is the parallel solution, the LX4." "Historically, serial has always won over parallel links both for optical and copper," explains Scintera president and CEO Abhijit Phanse. Its size also enables the chip to reduce both the number of components and complexity of enterprise networks by offering a viable alternative to the currently available LX4 CWDM approach standardized two years ago by the IEEE. The device is form-factor-agnostic its small size-a 5×5-mm QFN package-enables the chip to seamlessly integrate into any of the 10-Gbit/sec transponder multisource agreements (MSAs). It features adaptive equalization that betters the typical requirement of milliseconds or hundreds of microseconds Scintera's device clocks in at tens of microseconds or less. ![]() The SCN3142 compensates for dispersion in 850- and 1310-nm multimode fiber used in 10-Gigabit Ethernet, 10-Gbit/sec Fibre Channel, and short-reach SONET/SDH OC-192 data links, extending the usable distance of the fiber from 75–80 to 300 m. This 100-m span of 62.5-µm multimode fiber suffers from modal dispersion at 10 Gbits/sec, but the addition of the SCN3142 EDCE opens the eye and enables error-free transmission.
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