Business Combinations (Tables)

12 Months Ended

Oct. 31, 2011

Business Combinations [Abstract]

Estimated fair value of the acquired assets and assumed liabilities

The following table summarizes the final purchase price allocation related to the MEN Business, based on the estimated fair value of the acquired assets and assumed liabilities (in thousands):

	Final
	Allocation
Unbilled receivables	$	7,136
Inventories	146,272
Prepaid expenses and other	32,517
Other long-term assets	21,924
Equipment, furniture and fixtures	41,213
Developed technology	218,774
In-process research and development	11,000
Customer relationships, outstanding purchase orders and contracts	260,592
Trade name	2,000
Deferred revenue	(28,086		)
Accrued liabilities	(33,845		)
Other long-term obligations	(2,644		)
Total purchase price allocation	$	676,853

Pro forma of financial information

The following unaudited pro forma financial information summarizes the results of operations for the period indicated as if Ciena's acquisition of the MEN Business had been completed as of the beginning of the period presented. These pro forma amounts (in thousands) do not purport to be indicative of the results that would have actually been obtained if the acquisition occurred as of the beginning of the periods presented or that may be obtained in the future.

	Fiscal Year
	2009			2010
Pro forma revenue	$	1,704,037		$	1,592,911
Pro forma net loss	$	(1,008,894	)	$	(536,253	)