2017 Annual Report

Corporate Information

Notes to Investors The Annual Report contains certain forward-looking statements regarding future events or results that involve risks and uncertainties. These statements are based on current expectations, forecasts, assumptions and other information available to Ciena as of the date hereof. Forward-looking statements include Ciena's long-term financial targets, prospective financial results, return of capital plans, business strategies, expectations about its addressable markets and market share, and business outlook for future periods, as well as statements regarding Ciena's expectations, beliefs, intentions or strategies regarding the future. Often, these can be identified by forward-looking words such as "target" "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 and their business; changes in network spending or network strategy by large communication service providers; 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 our operations; changes in foreign currency exchange rates affecting revenue and operating expense; and the other risk factors disclosed in Ciena's Annual Report on Form10-K contained herein. All information, statements, and projections in this Annual Report speak only as of the date of the Annual Report. Ciena assumes no obligation to revise or update any forward-looking information included in this Annual Report, whether as a result of new information, future events, or otherwise.

This document includes certain adjusted or non-GAAP measures of Ciena's results of operations. These measures are not intended to be a substitute for financial information presented in accordance with GAAP. A detailed reconciliation of these non-GAAP measures to our GAAP results are included in the press release for the relevant period available on Ciena.com.