Ciena Reaffirms Financial Guidance

Ciena® Corporation

today reaffirmed its financial guidance for the fiscal fourth quarter ending October 31, 2010, which guidance was previously provided in connection with its third quarter results on September 8, 2010. As previously stated, Ciena currently expects a sequential increase in its fourth quarter revenue of up to 5 percent, which, based on third quarter results, reflects a revenue range of approximately $390 million to $409 million. Ciena also expects adjusted gross margin in the low 40s percent range. Adjusted gross margin is a non-GAAP measure that excludes the effects of share-based compensation expense and amortization of intangible assets.