Marketable Securities

9 Months Ended

Jul. 31, 2011

Marketable Securities [Abstract]

MARKETABLE SECURITIES

(5) MARKETABLE SECURITIES

     As of the date indicated, long-term investments are comprised of the following (in thousands):

	July 31, 2011
					Gross
			Gross Unrealized		Unrealized		Estimated Fair
	Amortized Cost		Gains		Losses		Value
U.S. government obligations	$	49,920	$	307	$	—	$	50,227
	$	49,920	$	307	$	—	$	50,227

     The following table summarizes final legal maturities of debt investments at July 31, 2011 (in thousands):

	Amortized		Estimated
	Cost		Fair Value
Less than one year	$	—	$	—
Due in 1-2 years		49,920		50,227
	$	49,920	$	50,227

     At October 31, 2010, Ciena did not have any investments in marketable debt securities.