Ciena

(CIEN) - Get 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.

JDS Uniphase

(JDSU)

was down 6.6%.

Corning

(GLW) - Get Report

was down 0.6%.