Earnings (Loss) Per Share Calculation (Tables)

6 Months Ended

Apr. 30, 2012

Reconciliation of numerator and denominator of Basic and Diluted Earnings Per Share

The following table (in thousands except per share amounts) is a reconciliation of the numerator and denominator of the basic net income (loss) per common share (“Basic EPS”) and the diluted net income (loss) per potential common share (“Diluted EPS”). Basic EPS is computed using the weighted average number of common shares outstanding. Diluted EPS is computed using the weighted average number of (i) common shares outstanding, (ii) shares issuable upon vesting of restricted stock units, (iii) shares issuable under Ciena’s employee stock purchase plan and upon exercise of outstanding stock options, using the treasury stock method; and (iv) shares underlying Ciena’s outstanding convertible notes.



	Quarter Ended April 30,						Six Months Ended April 30,
Numerator	2011			2012			2011			2012
Net loss	$	(62,686	)	$	(27,780	)	$	(141,742	)	$	(75,433	)



	Quarter Ended April 30,		Six Months Ended April 30,
Denominator	2011	2012	2011	2012
Basic weighted average shares outstanding	95,360	98,981	94,928	98,525
Dilutive weighted average shares outstanding	95,360	98,981	94,928	98,525



	Quarter Ended April 30,						Six Months Ended April 30,
EPS	2011			2012			2011			2012
Basic EPS	$	(0.66	)	$	(0.28	)	$	(1.49	)	$	(0.77	)
Diluted EPS	$	(0.66	)	$	(0.28	)	$	(1.49	)	$	(0.77	)

Weighted average shares excluded from calculation of denominator for Basic and Diluted EPS

The following table summarizes the weighted average shares excluded from the calculation of the denominator for Basic and Diluted EPS due to their anti-dilutive effect for the fiscal years indicated (in thousands):



	Quarter Ended April 30,		Six Months Ended April 30,
	2011	2012	2011	2012
Shares underlying stock options, restricted stock units and warrants	6,657	6,074	6,658	6,054
0.25% Convertible Senior Notes due May 1, 2013	5,470	5,470	5,470	5,470
4.00% Convertible Senior Notes due March 15, 2015	18,396	18,396	18,396	18,396
0.875% Convertible Senior Notes due June 15, 2017	13,108	13,108	13,108	13,108
3.75% Convertible Senior Notes due October 15, 2018	17,356	17,356	17,356	17,356
Total excluded due to anti-dilutive effect	60,987	60,404	60,988	60,384