Just at a time when many companies are getting out of the telecommunications sector, DuPont of Wilmington, Del., is entering it. The company has announced the formation of DuPont Photonics Technologies LLC as part of DuPont Ventures, which focuses on emerging technologies. Although some would argue that telecom is anything but emerging, Drew Weber, general manager of Photonics Technologies, sees no decrease in the appetite for data and voice communications. 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