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© Ciena Corporation 2025. All rights reserved. Proprietary Information.2 Forward-looking statements and non-GAAP measures You are encouraged to review the Investors section of our website, where we routinely post press releases, Securities and Exchange Commission (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. You are encouraged to review the Investors section of our website, where we routinely post press releases, Securities and Exchange Commission ("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. Information in this presentation and related comments of presenters 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. 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, their spending and their businesses and markets; our ability to execute our business and growth strategies; the impact of macroeconomic conditions; the impact of the introduction of new technologies by us or our competitors; seasonality and the timing and size of customer orders, their delivery dates and 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; changes in foreign currency exchange rates; factors beyond our control such as natural disasters, climate change, acts of war or terrorism, geopolitical tensions or events, including but not limited to the ongoing conflicts between Ukraine and Russia, and Israel and groups based in the surrounding region, and public health emergencies, epidemics, or pandemics; changes in tax or trade regulations, including the imposition of tariffs, duties or efforts to withdraw from or materially modify international trade agreements; cyberattacks, data breaches or other security incidents involving our enterprise network environment or our products; regulatory changes, litigation involving our intellectual property or government investigations; and the other risk factors disclosed in Ciena’s periodic reports filed with the Securities and Exchange Commission (SEC) including its Annual Report on Form 10-K filed with the SEC on December 20, 2024 and included in its Quarterly Report on Form 10-Q for the second quarter of fiscal 2025 to be filed with the SEC. All information, statements, and projections in this presentation and the related earnings call speak only as of the date of this presentation and related earnings call. Ciena assumes no obligation to update any forward-looking or other information included in this presentation or related earnings calls, whether as a result of new information, future events or otherwise. In addition, this presentation includes historical, and may include prospective, non-GAAP measures of Ciena’s gross margin, operating expense, operating margin, EBITDA, and net income per share. These measures are not intended to be a substitute for financial information presented in accordance with GAAP. A reconciliation of non-GAAP measures used in this presentation to Ciena’s GAAP results for the relevant period can be found in the Appendix to this presentation. Additional information can also be found in our press release filed this morning and in our reports on Form 10-Q and Form 10K filed with the Securities and Exchange Commission.

© Ciena Corporation 2025. All rights reserved. Proprietary Information.3 Table of Contents 1. Overview and Ciena's portfolio 2. Industry context and addressable market expansion 3. Ciena is positioned for accelerated growth 4. Fiscal Q2 2025 financial performance 5. Appendix

© Ciena Corporation 2025. All rights reserved. Proprietary Information.5 Ciena is the global leader in high-speed connectivity Ciena provides networking systems, services, and software We build the most adaptive networks in the industry, enabling customers to anticipate and meet ever-increasing digital demands. Prioritizing collaborative relationships with our customers, partners, and communities, we create flexible, open, and sustainable networks that better serve all users — today and into the future.

© Ciena Corporation 2025. All rights reserved. Proprietary Information.11 An industry leader #1 Globally • Data center interconnect • Optical for internet content provider customers • Purpose-built #1 N. America • Data center interconnect • Total optical networking • Optical packet Optical Transport Report, 1Q25 #1 Globally • Purpose-built/compact modular DCI • SLTE WDM • Access switching #1 N. America • Total optical networking • Purpose-built/compact modular DCI • Access switching Optical Networking Report, 4Q24 Service Provider Switching & Routing Report, 4Q24 #1 Globally • Purpose-built/compact modular DCI • Optical for cloud and colo • SLTE WDM • Routing/Access #1 N. America • Total optical networking • Optical for cloud and colo • Routing/Access Transport Hardware Report, 1Q25

© Ciena Corporation 2025. All rights reserved. Proprietary Information.13 Our future growth opportunities Long-term growth in core business plus new addressable markets provide an opportunity to outpace our traditional revenue CAGR over time

© Ciena Corporation 2025. All rights reserved. Proprietary Information.17 Q2 FY 2025 key highlights ▪ Non-telco represented 54% of total revenue ▪ Direct Cloud Provider revenue grew 85% YoY and represented 38% of total revenue ▪ EMEA revenue grew 23% YoY ▪ Blue Planet revenue nearly doubled YoY • Added another Cloud Provider for our WaveLogic 5 Nano coherent pluggable transceivers • Added 24 new WaveLogic 6 Extreme customers in Q2, bringing the total to 49 within just two quarters of availability • Record RLS quarter for both revenue and shipments • Added 8 additional broadband customers during the quarter for a total 87 customers • Expanded the breath of portfolio with the 8192 Coherent Router to our 8000 family, our first 800GbE router • Added WaveLogic 6 Extreme capabilities to the WaveRouter family to become the industry’s first generally available 1.6T coherent router • Total shareholder return five-year CAGR of 10%1 • Repurchased ~1.2 million shares for $84.3 million under our three-year program (FY25-27) 1 Based on closing share price between 5/16/2020 to 5/16/2025 Achieving balanced growth Prioritizing long term shareholder value Driving the pace of innovation

© Ciena Corporation 2025. All rights reserved. Proprietary Information.18 Q2 FY 2025 comparative financial highlights * Reconciliations of these non-GAAP measures to our GAAP results are included in the Appendix and in the press release for the relative period. Q2 FY 2025 Q2 FY 2024 Revenue $1,125.9M $910.8M Adjusted Gross Margin* 41.0% 43.5% Adjusted Operating Expense* $369.5M $333.9M Adjusted Operating Margin* 8.2% 6.8% Adjusted EBITDA* $116.7M $85.8M Adjusted EPS* $0.42 $0.27

© Ciena Corporation 2025. All rights reserved. Proprietary Information.19 Q2 FY 2025 comparative operating metrics Q2 FY 2025 Q2 FY 2024 Cash and investments $1.35B $1.42B Cash provided by operations $157M $59M DSO 87.0 98.0 Inventory Turns 2.5 1.6 Gross Leverage 3.15x 2.81x Net Debt $253M $195M

© Ciena Corporation 2025. All rights reserved. Proprietary Information.20 Revenue by segment (Amounts in millions) Q2 FY 2025 Q2 FY 2024 Revenue %** Revenue %** Networking Platforms Optical Networking $773.6 68.7 $560.2 61.5 Routing and Switching 92.7 8.2 116.1 12.7 Total Networking Platforms 866.3 76.9 676.3 74.2 Platform Software and Services 85.4 7.5 85.4 9.4 Blue Planet Automation Software and Services 28.0 2.5 14.4 1.6 Global Services Maintenance Support and Training 79.4 7.1 77.4 8.5 Installation and Deployment 58.2 5.2 43.8 4.8 Consulting and Network Design 8.6 0.8 13.5 1.5 Total Global Services 146.2 13.1 134.7 14.8 Total $1,125.9 100.0 $910.8 100.0 * Reconciliations of these non-GAAP measures to GAAP results are included in the appendix to this presentation. ** Denotes % of total revenue

© Ciena Corporation 2025. All rights reserved. Proprietary Information.24 Q2 FY 2025 Q1 FY 2025 Q4 FY 2024 Q3 FY 2024 Q2 FY 2024 GAAP gross profit $452,838 $471,821 $460,022 $403,945 $388,661 Share-based compensation-products 2,033 1,750 1,736 1,660 1,760 Share-based compensation-services 3,980 3,405 3,257 3,122 3,344 Amortization of intangible assets 2,232 2,233 2,764 2,764 2,763 Total adjustments related to gross profit 8,245 7,388 7,757 7,546 7,867 Adjusted (non-GAAP) gross profit $461,083 $479,209 $467,779 $411,491 $396,528 Adjusted (non-GAAP) gross profit percentage 41.0 % 44.7 % 41.6 % 43.7 % 43.5 % Gross Profit Reconciliation (Amounts in thousands)

© Ciena Corporation 2025. All rights reserved. Proprietary Information.25 Q2 FY 2025 Q1 FY 2025 Q4 FY 2024 Q3 FY 2024 Q2 FY 2024 GAAP operating expense $419,996 $391,158 $400,812 $377,202 $392,626 Share-based compensation-research and development 17,021 14,237 14,065 13,118 14,066 Share-based compensation-sales and marketing 13,649 11,597 11,168 10,315 11,166 Share-based compensation-general and administrative 11,341 9,827 10,842 9,257 9,875 Significant asset impairments and restructuring costs 1,948 1,544 2,605 1,361 15,655 Amortization of intangible assets 6,545 6,545 7,185 7,185 7,947 Total adjustments related to operating expense 50,504 43,750 45,865 41,236 58,709 Adjusted (non-GAAP) operating expense $369,492 $347,408 $354,947 $335,966 $333,917 Q2 FY 2025 Q1 FY 2025 Q4 FY 2024 Q3 FY 2024 Q2 FY 2024 GAAP income (loss) from operations $32,842 $80,663 $59,210 $26,743 $(3,965) Total adjustments related to gross profit 8,245 7,388 7,757 7,546 7,867 Total adjustments related to operating expense 50,504 43,750 45,865 41,236 58,709 Total adjustments related to income (loss) from operations 58,749 51,138 53,622 48,782 66,576 Adjusted (non-GAAP) income from operations $91,591 $131,801 $112,832 $75,525 $62,611 Adjusted (non-GAAP) operating margin percentage 8.2 % 12.3 % 10.0 % 8.0 % 6.8 % Operating Expense Reconciliation (Amounts in thousands) Income (Loss) from Operations Reconciliation (Amounts in thousands)

© Ciena Corporation 2025. All rights reserved. Proprietary Information.26 Q2 FY 2025 Q1 FY 2025 Q4 FY 2024 Q3 FY 2024 Q2 FY 2024 GAAP net income (loss) $8,969 $44,572 $37,028 $14,230 $(16,849) Exclude GAAP provision for income taxes 10,047 24,022 10,993 2,125 820 Income (loss) before income taxes 19,016 68,594 48,021 16,355 (16,029) Total adjustments related to income from operations 58,749 51,138 53,622 48,782 66,576 Loss on extinguishment and modification of debt — 729 — — — Adjusted income before income taxes 77,765 120,461 101,643 65,137 50,547 Non-GAAP tax provision on adjusted income before income taxes 17,108 26,501 22,361 14,330 11,120 Adjusted (non-GAAP) net income $60,657 $93,960 $79,282 $50,807 $39,427 Weighted average basic common shares outstanding 142,503 142,880 144,240 144,394 144,914 Weighted average diluted potential common shares outstanding(1) 144,972 145,944 146,487 145,361 146,268 Q2 FY 2025 Q1 FY 2025 Q4 FY 2024 Q3 FY 2024 Q2 FY 2024 GAAP diluted net income (loss) per potential common share $ 0.06 $ 0.31 $ 0.25 $ 0.10 $ (0.12) Adjusted (non-GAAP) diluted net income per potential common share $ 0.42 $ 0.64 $ 0.54 $ 0.35 $ 0.27 1. Weighted average dilutive potential common shares outstanding used in calculating Adjusted (non-GAAP) diluted net income per potential common share for the second quarter of fiscal 2025 includes 2.5 million shares underlying certain stock option and stock unit awards. Net Income (Loss) Reconciliation (Amounts in thousands) Net Income (Loss) per Common Share

© Ciena Corporation 2025. All rights reserved. Proprietary Information.27 Earnings Before Interest, Tax, Depreciation and Amortization (EBITDA) Q2 FY 2025 Q1 FY 2025 Q4 FY 2024 Q3 FY 2024 Q2 FY 2024 Net income (loss) (GAAP) $8,969 $44,572 $37,028 $14,230 $(16,849) Add: Interest expense 21,697 22,918 24,990 24,401 23,861 Less: Interest and other income, net 7,871 11,578 13,801 14,013 11,797 Add: Loss on extinguishment and modification of debt — 729 — — — Add: Provision for income taxes 10,047 24,022 10,993 2,125 820 Add: Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements 25,092 24,679 23,849 22,981 23,208 Add: Amortization of intangible assets 8,777 8,778 9,949 9,949 10,710 EBITDA $66,711 $114,120 $93,008 $59,673 $29,953 Add: Share-based compensation expense 48,024 40,816 41,068 37,472 40,211 Add: Significant asset impairments and restructuring expense 1,948 1,544 2,605 1,361 15,655 Adjusted EBITDA $116,683 $156,480 $136,681 $98,506 $85,819 Earnings Before Interest, Tax, Depreciation and Amortization (EBITDA) (Amounts in thousands)