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Ciena

(CIEN) - Get Ciena Corporation Report

was down 17.2% in afternoon trading. It was the second day of steep losses for the optical networking company. Some reports attributed the fall to comments by a

BlueStone Capital

telecom analyst, who raised concerns about a possible spending slowdown at one of the company's European customers. Other optical stocks were lower as well.

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Corning

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was down 0.6%.