…switching product Terabit April 22, 1998 April 22, 1998 Approximately $11.5 million1 Santa Barbara, CA Developer of optical components, specifically photodetectors Alta Telecom (aka. ATI) January 26, 1998 February 19, 1998 Approximately $52.2 million1 Norcross, GA Engineering, furnishing & installation…

…of certain Terabit stock options. Prior to the acquisition, Ciena had been a 20% owner of Terabit, a developer of optical components known as photodetectors or optical receivers. Based on the closing price of Ciena?s stock on Tuesday, April 21, 1998, the transaction is valued at approximately $11.7…