was down 5.8% in early trading.
After the close Thursday the optical networking supplier posted a fourth-quarter loss of 9 cents, beating the Street's estimate of an 11 cent loss. The company said it expects to break even in the fourth quarter this year.
Optical stocks were mostly lower.
was off 0.5% and
was down 1.7% after hitting a 52-week low of $42.10.