CIENA joins the S&P 500 Index

Aug. 30, 2001--CIENA Corporation (NASDAQ: CIEN), a provider of intelligent optical networking systems and software, announced it is now included in the S&P 500 Index.

Aug 30th, 2001

CIENA Corporation (NASDAQ: CIEN), a provider of intelligent optical networking systems and software, announced, as of Wednesday, August 29, 2001, it will be included in the S&P 500 Index.

CIENA will be added to the S&P 500 GICS Telecommunications Equipment sub-industry group and the Communications Equipment industry group. CIENA replaces American General in the index following American General's acquisition by American Int'l Group.

The S&P 500 Index consists of 500 stocks chosen for market size, liquidity, and industry group representation. It is a market-value weighted index (stock price times number of shares outstanding), with each stock's weight in the Index proportionate to its market value.

About CIENA:

CIENA Corporation's intelligent optical networking systems form the core of networks and services worldwide. For more information, visit www.CIENA.com.

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