Exhibit

FOR IMMEDIATE RELEASE

Ciena Reports Fiscal Fourth Quarter 2019 and Year-End Financial Results

HANOVER, Md. - December 12, 2019 - Ciena^® Corporation (NYSE: CIEN), a networking systems, services and software company, today announced unaudited financial results for its fiscal fourth quarter and year ended October 31, 2019.


•	Q4 Revenue: $968.0 million, increasing 7.6% year over year


•	Q4 Net Income per Share: $0.51 GAAP; $0.58 adjusted (non-GAAP)


•	Share Repurchases: Repurchased approximately 1.0 million shares of common stock for an aggregate price of $38.2 million during the quarter

"Our outstanding Q4 financial performance rounded out an extraordinary year of industry-leading growth and profitability," said Gary Smith, President and CEO, Ciena. "Our innovation, diversification and scale uniquely position us to continue taking share while delivering improved operating margin and driving sustained EPS growth in 2020."

For the fiscal fourth quarter 2019, Ciena reported revenue of $968.0 million as compared to $899.4 million for the fiscal fourth quarter 2018. For fiscal year 2019, Ciena reported revenue of $3.57 billion, as compared to $3.09 billion for fiscal year 2018.

Ciena's GAAP net income for the fiscal fourth quarter 2019 was $80.3 million or $0.51 per diluted common share, which compares to a GAAP net income of $64.0 million, or $0.34 per diluted common share, for the fiscal fourth quarter 2018. For fiscal year 2019, Ciena's GAAP net income was $253.4 million, or $1.61 per diluted common share, as compared to a GAAP net loss of $(344.7) million, or $(2.49) per diluted common share for fiscal year 2018.

Ciena's adjusted (non-GAAP) net income for the fiscal fourth quarter 2019 was $90.4 million, or $0.58 per diluted common share, which compares to an adjusted (non-GAAP) net income of $81.0 million, or $0.53 per diluted common share, for the fiscal fourth quarter 2018. For fiscal year 2019, Ciena's adjusted (non-GAAP) net income was $331.8 million, or $2.11 per diluted common share, as compared to an adjusted (non-GAAP) net income of $210.6 million, or $1.39 per diluted common share for fiscal year 2018.

Performance Summary for the Fiscal Fourth Quarter and the Year Ended October 31, 2019

The tables below (in millions, except percentage data) provide comparisons of certain quarterly and annual results to the prior year. Appendices A and B set forth reconciliations between the GAAP and adjusted (non-GAAP) measures contained in this release.



	GAAP Results (unaudited)
	Quarter Ended October 31,						Period Change		Year Ended October 31,						Period Change
	2019			2018			Y-T-Y*		2019			2018			Y-T-Y*
Revenue	$	968.0		$	899.4		7.6	%	$	3,572.1		$	3,094.3		15.4	%
Gross margin	43.4		%	44.3		%	(0.9	)%	43.2		%	42.5		%	0.7	%
Operating expense	$	326.5		$	302.2		8.0	%	$	1,195.3		$	1,084.7		10.2	%
Operating margin	9.6		%	10.7		%	(1.1	)%	9.7		%	7.4		%	2.3	%



	Non-GAAP Results (unaudited)
	Quarter Ended October 31,						Period Change		Year Ended October 31,						Period Change
	2019			2018			Y-T-Y*		2019			2018			Y-T-Y*
Revenue	$	968.0		$	899.4		7.6	%	$	3,572.1		$	3,094.3		15.4	%
Adj. gross margin	43.8		%	44.7		%	(0.9	)%	43.7		%	43.0		%	0.7	%
Adj. operating expense	$	295.3		$	277.7		6.3	%	$	1,091.8		$	993.6		9.9	%
Adj. operating margin	13.3		%	13.9		%	(0.6	)%	13.1		%	10.9		%	2.2	%

* Denotes % change, or in the case of margin, absolute change



	Revenue by Segment (unaudited)
	Quarter Ended October 31,
	2019			2018
	Revenue		%^**	Revenue		% ^**
Networking Platforms
Converged Packet Optical	$	665.8	68.8	$	646.4	71.9
Packet Networking	131.9		13.6	66.5		7.4
Total Networking Platforms	797.7		82.4	712.9		79.3

Platform Software and Services	41.2		4.3	56.6		6.3

Blue Planet Automation Software and Services	16.6		1.7	10.7		1.2

Global Services
Maintenance Support and Training	65.3		6.7	67.4		7.5
Installation and Deployment	36.5		3.8	39.3		4.4
Consulting and Network Design	10.7		1.1	12.5		1.3
Total Global Services	112.5		11.6	119.2		13.2

Total	$	968.0	100.0	$	899.4	100.0



	Revenue by Segment (unaudited)
	Year Ended October 31,
	2019			2018
	Revenue		%^**	Revenue		% ^**
Networking Platforms
Converged Packet Optical	$	2,562.8	71.8	$	2,194.6	70.9
Packet Networking	348.5		9.8	283.5		9.2
Total Networking Platforms	2,911.3		81.6	2,478.1		80.1

Platform Software and Services	155.3		4.3	174.0		5.6

Blue Planet Automation Software and Services	54.6		1.5	26.7		0.9

Global Services
Maintenance Support and Training	261.3		7.3	245.1		7.9
Installation and Deployment	148.2		4.1	128.8		4.2
Consulting and Network Design	41.4		1.2	41.6		1.3
Total Global Services	450.9		12.6	415.5		13.4

Total	$	3,572.1	100.0	$	3,094.3	100.0

Additional Performance Metrics for Fiscal Fourth Quarter and Year Ended October 31, 2019



	Revenue by Geographic Region (unaudited)
	Quarter Ended October 31,
	2019			2018
	Revenue		% ^**	Revenue		% ^**
North America	$	672.7	69.5	$	555.3	61.7
Europe, Middle East and Africa	153.0		15.8	123.1		13.7
Caribbean and Latin America	43.0		4.4	53.0		5.9
Asia Pacific	99.3		10.3	168.0		18.7
Total	$	968.0	100.0	$	899.4	100.0



	Revenue by Geographic Region (unaudited)
	Year Ended October 31,
	2019			2018
	Revenue		% ^**	Revenue		% ^**
North America	$	2,351.3	65.8	$	1,886.4	61.0
Europe, Middle East and Africa	566.7		15.9	464.9		15.0
Caribbean and Latin America	152.6		4.3	140.2		4.5
Asia Pacific	501.5		14.0	602.8		19.5
Total	$	3,572.1	100.0	$	3,094.3	100.0

** Denotes % of total revenue

•One 10%-plus customer represented a total of 15.1% of revenue for the fiscal quarter

•Three 10%-plus customers represented a total of 34.1% of revenue for the fiscal year


•	Cash and investments totaled $1,024.0 million


•	Cash flow from operations totaled $240.0 million and $413.1 million for the fiscal quarter and year, respectively


•	Average days' sales outstanding (DSOs) were 75 and 82 for the fiscal quarter and year, respectively


•	Accounts receivable balance was $724.9 million


•	Unbilled contract asset balance was $84.0 million


•	Inventories totaled $345.0 million, including:


◦	Raw materials: $99.0 million


◦	Work in process: $13.7 million


◦	Finished goods: $226.6 million


◦	Deferred cost of sales: $53.0 million


◦	Reserve for excess and obsolescence: $(47.3) million


•	Product inventory turns were 5.4 and 5.0 for the fiscal quarter and year, respectively


•	Headcount totaled 6,383

Share Repurchase Program

During fiscal year 2019, Ciena repurchased approximately 3.8 million shares of its common stock at an average price of $39.10 per share for an aggregate purchase price of $150.1 million.

Ciena may purchase shares at management's discretion in the open market, in privately negotiated transactions, in transactions structured through investment banking institutions, or a combination of the foregoing. Ciena may also, from time to time, enter into Rule 10b5-1 plans to facilitate repurchases of its shares under this authorization. The amount and timing of repurchases are subject to a variety of factors including liquidity, cash flow, stock price, and general business and market conditions. The program may be modified, suspended or discontinued at any time.

Supplemental Materials and Live Web Broadcast of Unaudited Fiscal Fourth Quarter 2019 Results

Today, Thursday, December 12, 2019, in conjunction with this announcement, Ciena has posted to the Quarterly Results page of the Investor Relations section of its website certain related supporting materials for its unaudited fiscal fourth quarter and fiscal 2019 results.

Ciena's management will also host a discussion today with investors and financial analysts that will include the Company's outlook. The live audio web broadcast beginning at 8:30 a.m. Eastern will be accessible via www.ciena.com. An archived replay of the live broadcast will be available shortly following its conclusion on the Investor Relations page of Ciena's website.

Notes to Investors

Forward-Looking Statements. You are encouraged to review the Investors section of our website, where we routinely post press releases, SEC filings, recent news, financial results, supplemental financial information, and other announcements. From time to time we exclusively post material information to this website along with other disclosure channels that we use. This press release contains certain forward-looking statements that involve risks and uncertainties. These statements are based on current expectations, forecasts, assumptions and other information available to the Company as of the date hereof. Forward-looking statements include statements regarding Ciena's expectations, beliefs, intentions or strategies regarding the future and can be identified by forward-looking words such as "anticipate," "believe," "could," "estimate," "expect," "intend," "may," "should," "will," and "would" or

similar words. Forward-looking statements in this release include: "Our outstanding Q4 financial performance rounded out an extraordinary year of industry-leading growth and profitability."; "Our innovation, diversification and scale uniquely position us to continue taking share while delivering improved operating margin and driving sustained EPS growth in 2020."

Ciena's actual results, performance or events may differ materially from these forward-looking statements made or implied due to a number of risks and uncertainties relating to Ciena's business, including: the effect of broader economic and market conditions on our customers and their business; changes in network spending or network strategy by customers; seasonality and the timing and size of customer orders, including our ability to recognize revenue relating to such sales; the level of competitive pressure we encounter; the product, customer and geographic mix of sales within the period; supply chain disruptions and the level of success relating to efforts to optimize Ciena's operations; changes in foreign currency exchange rates affecting revenue and operating expense; the impact of the Tax Cuts and Jobs Act, changes in estimates of prospective income tax rates and any adjustments to Ciena's provisional estimates whether related to further guidance, analysis or otherwise, and the other risk factors disclosed in Ciena's periodic reports filed with the Securities and Exchange Commission, including its Quarterly Report on Form 10-Q filed with the SEC on September 11, 2019 and its Annual Report on Form 10-K to be filed with the SEC. Ciena assumes no obligation to update any forward-looking information included in this press release.

Non-GAAP Presentation of Quarterly and Annual Results. This release includes non-GAAP measures of Ciena's gross profit, operating expense, income from operations, earnings before interest, tax, depreciation and amortization (EBITDA), Adjusted EBITDA, and measures of net income and net income per share. In evaluating the operating performance of Ciena's business, management excludes certain charges and credits that are required by GAAP. These items share one or more of the following characteristics: they are unusual and Ciena does not expect them to recur in the ordinary course of its business; they do not involve the expenditure of cash; they are unrelated to the ongoing operation of the business in the ordinary course; or their magnitude and timing is largely outside of Ciena's control. Management believes that the non-GAAP measures below provide management and investors useful information and meaningful insight to the operating performance of the business. The presentation of these non-GAAP financial measures should be considered in addition to Ciena's GAAP results and these measures are not intended to be a substitute for the financial information prepared and presented in accordance with GAAP. Ciena's non-GAAP measures and the related adjustments may differ from non-GAAP measures used by other companies and should only be used to evaluate Ciena's results of operations in conjunction with our corresponding GAAP results. To the extent not previously disclosed in a prior Ciena financial results press release for the relevant period, Appendix A and B to this press release set forth a complete GAAP to non-GAAP reconciliation of the non-GAAP measures contained in this release.

About Ciena. Ciena (NYSE: CIEN) is a networking systems, services and software company. We provide solutions that help our clients create the Adaptive Network™ in response to the constantly changing demands of their users. By delivering best-in-class networking technology through high-touch consultative relationships, we build the world’s most agile networks with automation, openness and scale. For updates on Ciena, follow us on Twitter @Ciena, LinkedIn, the Ciena Insights blog, or visit www.ciena.com.

CIENA CORPORATION

CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)



	Quarter Ended October 31,						Year Ended October 31,
	2019			2018			2019			2018
Revenue:
Products	$	820,007		$	743,867		$	2,983,815		$	2,565,460
Services	147,980			155,489			588,316			528,826
Total revenue	967,987			899,356			3,572,131			3,094,286
Cost of goods sold:
Products	469,945			421,583			1,716,358			1,507,157
Services	78,346			79,698			313,707			272,439
Total cost of goods sold	548,291			501,281			2,030,065			1,779,596
Gross profit	419,696			398,075			1,542,066			1,314,690
Operating expenses:
Research and development	141,657			134,983			548,139			491,564
Selling and marketing	117,201			112,791			423,046			394,060
General and administrative	50,307			44,539			174,399			160,133
Amortization of intangible assets	5,222			4,654			21,808			15,737
Acquisition and integration costs	(735		)	3,778			3,370			5,111
Significant asset impairments and restructuring costs	12,842			1,460			24,538			18,139
Total operating expenses	326,494			302,205			1,195,300			1,084,744
Income from operations	93,202			95,870			346,766			229,946
Interest and other income (loss), net	(1,183		)	(13,357		)	3,876			(12,029		)
Interest expense	(9,136		)	(14,873		)	(37,452		)	(55,249		)
Loss on extinguishment and modification of debt	—			(13,887		)	—			(13,887		)
Income before income taxes	82,883			53,753			313,190			148,781
Provision (benefit) for income taxes	2,552			(10,224		)	59,756			493,471
Net income (loss)	$	80,331		$	63,977		$	253,434		$	(344,690	)

Net Income (Loss) per Common Share
Basic net income (loss) per common share	$	0.52		$	0.45		$	1.63		$	(2.40	)
Diluted net income (loss) per potential common share¹	$	0.51		$	0.34		$	1.61		$	(2.49	)

Weighted average basic common shares outstanding	154,852			143,659			155,720			143,738
Weighted average diluted potential common shares outstanding ²	156,612			157,745			157,612			143,738

1. The calculation of GAAP diluted net income per common share for the fourth quarter of fiscal 2018 requires a) adding back interest expense of approximately $0.4 million associated with Ciena's "Original" 3.75% convertible senior notes, which were converted by holders thereof immediately prior to maturity during the fourth quarter of fiscal 2018 and approximately $2.8 million associated with Ciena's 4.0% convertible senior notes, which were converted at Ciena's election during the fourth quarter of fiscal 2018, and b) reducing net income by $12.9 million for a non-cash loss due to a mark to market fair value adjustment related to the outstanding conversion feature of Ciena's "New" 3.75% senior convertible notes, which were converted by holders thereof immediately prior to maturity during the fourth quarter of fiscal 2018, in order to derive the numerator for the diluted earnings per common share calculation.

The calculation of GAAP diluted net loss per common share for fiscal 2018 requires an adjustment of $12.9 million for a non-cash loss due to a mark to market fair value adjustment related to the outstanding conversion feature of Ciena's "New" 3.75% senior convertible notes to the GAAP net loss in order to derive the numerator for the diluted earnings per common share calculation.

2. Weighted average dilutive potential common shares outstanding used in calculating GAAP diluted net income per common share for the fourth quarter of fiscal 2019 includes 1.8 million shares underlying certain stock option and stock unit awards.

Weighted average dilutive potential common shares outstanding used in calculating GAAP diluted net income per common share for fiscal 2019 includes 1.9 million shares underlying certain stock option and stock unit awards.

Weighted average dilutive potential common shares outstanding used in calculating GAAP diluted net income per common share for the fourth quarter of fiscal 2018 includes 2.0 million shares underlying certain stock option and stock unit awards, 0.7 million and 2.5 million shares underlying Ciena's "New" and "Original" 3.75% convertible senior notes, respectively, and 8.9 million shares underlying Ciena's 4.0% convertible senior notes.

CIENA CORPORATION

CONDENSED UNAUDITED CONSOLIDATED BALANCE SHEETS

(in thousands, except share data)



	October 31,
	2019			2018
ASSETS
Current assets:
Cash and cash equivalents	$	904,045		$	745,423
Short-term investments	109,940			148,981
Accounts receivable, net	724,854			786,502
Inventories	345,049			262,751
Prepaid expenses and other	297,914			198,945
Total current assets	2,381,802			2,142,602
Long-term investments	10,014			58,970
Equipment, building, furniture and fixtures, net	286,884			292,067
Goodwill	297,937			297,968
Other intangible assets, net	112,781			148,225
Deferred tax asset, net	714,942			745,039
Other long-term assets	88,986			71,652
Total assets	$	3,893,346		$	3,756,523
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	344,819		$	340,582
Accrued liabilities and other short-term obligations	382,740			340,075
Deferred revenue	111,381			111,134
Current portion of long-term debt	7,000			7,000
Debt conversion liability	—			164,212
Total current liabilities	845,940			963,003
Long-term deferred revenue	45,492			58,323
Other long-term obligations	148,747			119,413
Long-term debt, net	680,406			686,450
Total liabilities	$	1,720,585		$	1,827,189

Stockholders’ equity:
Preferred stock — par value $0.01; 20,000,000 shares authorized; zero shares issued and outstanding	—			—
Common stock — par value $0.01; 290,000,000 shares authorized; 154,403,850 and 154,318,531 shares issued and outstanding	1,544			1,543
Additional paid-in capital	6,837,714			6,881,223
Accumulated other comprehensive loss	(22,084		)	(5,780		)
Accumulated deficit	(4,644,413		)	(4,947,652		)
Total stockholders’ equity	2,172,761			1,929,334
Total liabilities and stockholders’ equity	$	3,893,346		$	3,756,523

CIENA CORPORATION

CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)



	Year Ended October 31,
	2019			2018
Cash flows from operating activities:
Net income (loss)	$	253,434		$	(344,690	)
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on extinguishment of debt	—			10,039
Loss on fair value of debt conversion liability	—			12,070
Depreciation of equipment, furniture and fixtures, and amortization of leasehold improvements	87,576			84,214
Share-based compensation costs	59,736			52,972
Amortization of intangible assets	35,136			25,806
Deferred taxes	19,865			463,631
Provision for doubtful accounts	6,740			2,700
Provision for inventory excess and obsolescence	28,085			30,615
Provision for warranty	23,105			20,992
Other	(910		)	21,685
Changes in assets and liabilities:
Accounts receivable	65,712			(168,357		)
Inventories	(112,941		)	(27,445		)
Prepaid expenses and other	(96,618		)	(21,425		)
Accounts payable, accruals and other obligations	27,740			85,798
Deferred revenue	16,480			(19,344		)
Net cash provided by operating activities	413,140			229,261
Cash flows used in investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(62,579		)	(67,616		)
Purchase of available for sale securities	(158,074		)	(286,824		)
Proceeds from maturities of available for sale securities	248,748			410,109
Settlement of foreign currency forward contracts, net	(1,351		)	9,385
Purchase of equity investment	(2,667		)	(1,767		)
Acquisition of businesses, net of cash acquired	—			(82,670		)
Net cash provided by (used in) investing activities	24,077			(19,383		)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net	—			305,125
Payment of long-term debt	(7,000		)	(292,730		)
Payment for debt conversion liability	(111,268		)	—
Payment for make-whole provision upon conversion of long-term debt	—			(13,453		)
Payment of debt issuance costs	(1,191		)	(1,936		)
Payment of capital lease obligations	(3,319		)	(3,624		)
Shares repurchased for tax withholdings on vesting of restricted stock units	(29,059		)	(4,757		)
Repurchases of common stock - repurchase program	(150,076		)	(110,981		)
Proceeds from issuance of common stock	22,947			23,127
Net cash used in financing activities	(278,966		)	(99,229		)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	476			(5,856		)
Net increase (decrease) in cash, cash equivalents and restricted cash	158,727			104,793
Cash, cash equivalents and restricted cash at beginning of fiscal year	745,434			640,641
Cash, cash equivalents and restricted cash at end of fiscal year	$	904,161		$	745,434
Supplemental disclosure of cash flow information
Cash paid during the fiscal year for interest	$	39,579		$	44,750
Cash paid during the fiscal year for income taxes, net	$	33,570		$	26,900
Non-cash investing and financing activities
Purchase of equipment in accounts payable	$	16,549		$	5,118
Contingent consideration for acquisition of business	$	—		$	10,900
Conversion of 3.75% convertible senior notes, due October 15, 2018 (Original) into 3,038,208 shares of common stock	$	—		$	61,270
Conversion of 4.0% convertible senior notes, due December 15, 2020 into 9,197,943 shares of common stock, net	$	—		$	214,286
Conversion of debt conversion liability into 1,585,140 shares of common stock	$	52,944		$	—



APPENDIX A- Reconciliation of Adjusted (Non- GAAP) Measurements (unaudited)

	Quarter Ended						Year Ended
	October 31,						October 31,
	2019			2018			2019			2018
Gross Profit Reconciliation (GAAP/non-GAAP)
GAAP gross profit	$	419,696		$	398,075		$	1,542,066		$	1,314,690
Share-based compensation-products	748			705			2,868			2,984
Share-based compensation-services	715			651			3,175			2,616
Amortization of intangible assets	3,303			2,957			13,327			10,069
Total adjustments related to gross profit	4,766			4,313			19,370			15,669
Adjusted (non-GAAP) gross profit	$	424,462		$	402,388		$	1,561,436		$	1,330,359
Adjusted (non-GAAP) gross profit percentage	43.8		%	44.7		%	43.7		%	43.0		%

Operating Expense Reconciliation (GAAP/non-GAAP)
GAAP operating expense	$	326,494		$	302,205		$	1,195,300		$	1,084,744
Share-based compensation-research and development	3,287			3,385			14,321			13,518
Share-based compensation-sales and marketing	4,151			3,741			16,474			14,246
Share-based compensation-general and administrative	6,425			5,588			22,841			19,709
Amortization of intangible assets	5,222			4,654			21,808			15,737
Acquisition and integration costs	(735		)	3,778			3,370			5,111
Significant asset impairments and restructuring costs	12,842			1,460			24,538			18,139
Legal settlements	—			1,929			137			4,682
Total adjustments related to operating expense	$	31,192		$	24,535		$	103,489		$	91,142
Adjusted (non-GAAP) operating expense	$	295,302		$	277,670		$	1,091,811		$	993,602

Income from Operations Reconciliation (GAAP/non-GAAP)
GAAP income from operations	$	93,202		$	95,870		$	346,766		$	229,946
Total adjustments related to gross profit	4,766			4,313			19,370			15,669
Total adjustments related to operating expense	31,192			24,535			103,489			91,142
Total adjustments related to income from operations	35,958			28,848			122,859			106,811
Adjusted (non-GAAP) income from operations	$	129,160		$	124,718		$	469,625		$	336,757
Adjusted (non-GAAP) operating margin percentage	13.3		%	13.9		%	13.1		%	10.9		%



APPENDIX A- Reconciliation of Adjusted (Non- GAAP) Measurements (unaudited)

	Quarter Ended					Year Ended
	October 31,					October 31,
	2019		2018			2019		2018
Net Income (Loss) Reconciliation (GAAP/non-GAAP)
GAAP net income (loss)	$	80,331	$	63,977		$	253,434	$	(344,690	)
Exclude GAAP provision (benefit) for income taxes	2,552		(10,224		)	59,756		493,471
Income before income taxes	82,883		53,753			313,190		148,781
Total adjustments related to income from operations	35,958		28,848			122,859		106,811
Loss on extinguishment and modification of debt	—		13,887			—		13,887
Non-cash interest expense	—		727			—		2,579
Change in fair value of debt conversion liability	—		12,070			—		12,070
Adjusted income before income taxes	118,841		109,285			436,049		284,128
Non-GAAP tax provision on adjusted income before income taxes	28,403		28,272			104,216		73,504
Adjusted (non-GAAP) net income	$	90,438	$	81,013		$	331,833	$	210,624

Weighted average basic common shares outstanding	154,852		143,659			155,720		143,738
Weighted average dilutive potential common shares outstanding ¹	156,612		157,745			157,612		158,884

Net Income (Loss) per Common Share
GAAP diluted net income (loss) per common share	$	0.51	$	0.34		$	1.61	$	(2.49	)
Adjusted (non-GAAP) diluted net income per common share ²	$	0.58	$	0.53		$	2.11	$	1.39

1. Weighted average dilutive potential common shares outstanding used in calculating adjusted (non-GAAP) diluted net income per common share for the fourth quarter of fiscal 2019 includes 1.8 million shares underlying certain stock option and stock unit awards.

Weighted average dilutive potential common shares outstanding used in calculating adjusted (non-GAAP) diluted net income per common share for fiscal 2019 includes 1.9 million shares underlying certain stock option and stock unit awards.

Weighted average dilutive potential common shares outstanding used in calculating adjusted (non-GAAP) diluted net income per common share for the fourth quarter of fiscal 2018 includes 2.0 million shares underlying certain stock option and stock unit awards, 0.7 million and 2.5 million shares underlying Ciena's "New" and "Original" 3.75% convertible senior notes, respectively, which were converted by holders thereof immediately prior to maturity during the fourth quarter of fiscal 2018, and 8.9 million shares underlying Ciena's 4.0% convertible senior notes, which were converted at Ciena's election during the fourth quarter of fiscal 2018.

Weighted average dilutive potential common shares outstanding used in calculating adjusted (non-GAAP) diluted net income per common share for fiscal 2018 includes 1.4 million shares underlying certain stock option and stock unit awards, 1.8 million and 2.9 million shares underlying Ciena's "New" and "Original" 3.75% convertible senior notes, respectively, and 9.1 million shares underlying Ciena's 4.0% convertible senior notes.

2. The calculation of adjusted (non-GAAP) diluted net income per common share for the fourth quarter of fiscal 2018 requires adding back interest expense of approximately $0.4 million associated with Ciena's "Original" 3.75% convertible senior notes and approximately $2.3 million associated with Ciena's 4.0% convertible senior notes to the adjusted (non-GAAP) net income in order to derive the numerator for the adjusted (non-GAAP) earnings per common share calculation.

The calculation of adjusted (non-GAAP) diluted net income per common share for fiscal 2018 requires adding back interest expense of approximately $1.8 million associated with Ciena's "Original" 3.75% convertible senior notes and approximately $8.7 million associated with Ciena's 4.0% convertible senior notes to the adjusted (non-GAAP) net income in order to derive the numerator for the adjusted (non-GAAP) earnings per common share calculation.



APPENDIX B- Calculation of EBITDA and Adjusted EBITDA (unaudited)

	Quarter Ended						Year Ended
	October 31,						October 31,
	2019			2018			2019		2018
Earnings Before Interest, Tax, Depreciation and Amortization (EBITDA)
Net income (loss) (GAAP)	$	80,331		$	63,977		$	253,434	$	(344,690	)
Add: Interest expense	9,136			14,873			37,452		55,249
Less: Interest and other income (loss), net	(1,183		)	(13,357		)	3,876		(12,029		)
Add: Loss on extinguishment and modification of debt	—			(13,887		)	—		(13,887		)
Add: Provision (benefit) for income taxes	2,552			(10,224		)	59,756		493,471
Add: Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	22,505			21,110			87,576		84,214
Add: Amortization of intangible assets	8,525			7,611			35,136		25,806
EBITDA	$	124,232		$	124,591		$	469,478	$	339,966
Add: Shared-based compensation cost	15,290			14,076			59,736		52,972
Add: Significant asset impairments and restructuring costs	12,842			1,460			24,538		18,139
Add: Acquisition and integration costs	(735		)	3,778			3,370		5,111
Add: Legal settlement	—			1,929			137		4,682
Adjusted EBITDA	$	151,629		$	145,834		$	557,259	$	420,870

* * *

The adjusted (non-GAAP) measures above and their reconciliation to Ciena's GAAP results for the periods presented reflect adjustments relating to the following items:


•	Share-based compensation - a non-cash expense incurred in accordance with share-based compensation accounting guidance.


•	Amortization of intangible assets - a non-cash expense arising from the acquisition of intangible assets, principally developed technologies and customer-related intangibles, that Ciena is required to amortize over its expected useful life.


•	Acquisition and integration costs - consist of financial, legal and accounting advisors' costs and severance and other employment-related costs related to Ciena's acquisition of Packet Design and DonRiver. Ciena does not believe that these costs are reflective of its ongoing operating expense following its completion of these integration activities.


•	Significant asset impairments and restructuring costs - costs incurred as a result of restructuring activities taken to align resources with perceived market opportunities.


•	Legal settlements - costs incurred as a result of settlements, during the first quarter of fiscal 2019, the third quarter of fiscal 2018 and the fourth quarter of fiscal 2018.


•	Loss on extinguishment and modification of debt - reflects extinguishment of debt costs related to our conversion of Ciena's 4.0% convertible senior notes and debt modification expenses related to refinancing our then existing term loan, both of which occurred during the fourth quarter of fiscal 2018.


•	Non-cash interest expense - a non-cash debt discount expense amortized as interest expense during the term of Ciena's 4.0% senior convertible notes, which were converted during the fourth quarter of 2018, relating to the required separate accounting of the equity component of these convertible notes.


•	Change in fair value of debt conversion liability - a non-cash loss reflective of a mark to market fair value adjustment related to the outstanding conversion feature of Ciena's "New" 3.75% senior convertible notes.


•	Non-GAAP tax provision - consists of current and deferred income tax expense commensurate with the level of adjusted income before income taxes and utilizes a current, blended U.S. and foreign statutory annual tax rate of 23.9% for fiscal 2019, and 25.9% for fiscal 2018. This rate may be subject to change in the future, including as a result of changes in tax policy or tax strategy.