Shares of Ciena Corp. tumbled 11 percent Thursday after the computer networking equipment maker posted a wider-than-expected loss for its fiscal 2009 fourth quarter and full year as costs offset strong revenue results. The Linthicum, Md.-based company…

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Computer networkingCorporationCiena CorporationData CommunicationsBusiness

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Ciena shares tumble on wider-than-expected 4Q loss