PETALUMA, Calif.--(BUSINESS WIRE)--Cyan Inc. (NYSE:CYNI), a leading provider of SDN, NFV, and packet-optical solutions for network operators, today announced it has entered into a definitive agreement to be acquired by Ciena (NYSE:CIEN) for an aggregate purchase price of approximately $400 million (or approximately $335 million net of cash). Cyan also announced financial results for its first quarter ended March 31, 2015. Upon the closing of the transaction, Cyan shareholders will receive consi