Accounts Receivable

9 Months Ended

Jul. 31, 2011

Accounts Receivable [Abstract]

ACCOUNTS RECEIVABLE

(7) ACCOUNTS RECEIVABLE

     Allowance for doubtful accounts was $0.1 million and $0.9 million as of October 31, 2010 and July 31, 2011, respectively. Ciena has not historically experienced a significant amount of bad debt expense.