Cyan Reschedules 2015 Annual Meeting

PETALUMA, Calif., May 11, 2015, Cyan Inc. (NYSE: CYNI), a leading provider of SDN, NFV, and packet-optical solutions for network operators, today announced it has postponed its 2015 Annual Meeting of Stockholders in order to combine the Company’s annual meeting with the meeting of the Company’s stockholders required to vote on the proposed merger of Cyan with Ciena Corporation that was announced by Cyan on May 4, 2015.

The 2015 Annual Meeting will take place at a date, time and location to be determined. A formal notice setting forth the exact date, time and location of the annual meeting will be included in the registration statement and joint proxy statement/prospectus that Ciena will file with the SEC regarding the proposed merger between Cyan and Ciena. The registration statement and joint proxy statement/prospectus will provide information about the merger and the other proposals to be considered at the 2015 Annual Meeting.

Completion of the transaction between Cyan and Ciena is subject to customary closing conditions, including, among other things, the approval by Cyan stockholders and the receipt of certain regulatory approvals.

About Cyan

Cyan (NYSE: CYNI) enables network transformation. The company’s SDN, NFV, and packet-optical solutions deliver orchestration, agility, and scale to networks, that until now, have been static and hardware driven. Serving carriers, enterprises, governments, and data centers globally, Cyan’s open platforms provide multi-vendor, multi-layer control and visibility to network operators, making service delivery more efficient and profitable. Cyan’s solutions include the award-winning Blue Planet software and N-Series hyperscale and Z-Series packet-optical hardware platforms. For more information, please visit www.cyaninc.com or follow Cyan on Twitter at twitter.com/CyanNews.

Cautionary Statement Regarding Forward Looking Statements

This communication contains “forward-looking” statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and the Private Securities Litigation Reform Act of 1995, known as the PSLRA. These statements, as they relate to Cyan (“Cyan”) or Ciena Corporation (“Ciena”), the management of either such company or the proposed transaction between Cyan and Ciena, involve risks and uncertainties that may cause results to differ materially from those set forth in the statements. These statements are based on current plans, estimates and projections, and therefore, you are cautioned not to place undue reliance on them. No forward-looking statement can be guaranteed, and actual results may differ materially

from those projected. Cyan and Ciena undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise, except to the extent required by law. Forward-looking statements are not historical facts, but rather are based on current expectations, estimates, assumptions and projections about the business and future financial results of the networking industry, and other legal, regulatory and economic developments. We use words such as “anticipates,” “believes,” “plans,” “expects,” “projects,” “future,” “intends,” “may,” “will,” “should,” “could,” “estimates,” “predicts,” “potential,” “continue,” “guidance,” and similar expressions to identify these forward-looking statements that are intended to be covered by the safe harbor provisions of the PSLRA. Actual results could differ materially from the results contemplated by these forward-looking statements due to a number of factors, including, but not limited to, those described in the documents Cyan and Ciena have filed with the U.S. Securities and Exchange Commission (the “SEC”) as well as the possibility that (1) Cyan and Ciena may be unable to obtain stockholder or regulatory approvals required for the proposed transaction or may be required to accept conditions that could reduce the anticipated benefits of the merger as a condition to obtaining regulatory approvals; (2) the length of time necessary to consummate the proposed transaction may be longer than anticipated; (3) problems may arise in successfully integrating the businesses of Cyan and Ciena or such integration may be more difficult, time-consuming or costly than expected; (4) Cyan’s and/or Ciena’s businesses may suffer as a result of uncertainty surrounding the proposed transaction, including difficulties in maintaining relationships with customers or retaining key employees; (6) the parties may be unable to meet expectations regarding the timing, completion and accounting and tax treatments of the transaction; or (7) the industry may be subject to future risks that are described in the “Risk Factors” section of the Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and other documents filed from time to time with the SEC by Cyan and Ciena. Neither Cyan nor Cyan gives any assurance that either Ciena or Cyan will achieve its expectations.

The foregoing list of factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties that affect the businesses of Cyan and Ciena described in the “Risk Factors” section of their respective Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and other documents filed by either of them from time to time with the SEC. All forward-looking statements included in this document are based upon information available to Cyan and Ciena on the date hereof, and neither Cyan nor Ciena assumes any obligation to update or revise any such forward-looking statements.

Additional Information and Where to Find It

This document relates to a proposed transaction between Cyan and Ciena, which will become the subject of a registration statement and joint proxy statement/prospectus forming a part thereof to be filed with the SEC by Ciena. This document is not a substitute for the registration statement

and joint proxy statement/prospectus that Ciena will file with the SEC or any other documents that Cyan or Ciena may file with the SEC or send to stockholders in connection with the proposed transaction. Before making any voting decision, investors and security holders are urged to read the registration statement, joint proxy statement/prospectus and all other relevant documents filed or that will be filed with the SEC in connection with the proposed transaction as they become available because they will contain important information about the proposed transaction and related matters.

Investors and security holders will be able to obtain free copies of the registration statement, joint proxy statement/prospectus and all other relevant documents filed or that will be filed with the SEC by Cyan or Ciena through the website maintained by the SEC at www.sec.gov.

In addition, investors and security holders will be able to obtain free copies of the joint proxy statement/prospectus, once it is filed, from Cyan by accessing Cyan’s website at investor.cyaninc.com/investors/default.aspx or upon written request to ir@cyaninc.com.

Participants in Solicitation

Cyan, Ciena and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from Cyan’s stockholders in connection with the proposed transaction. Information regarding Cyan’s directors and executive officers is contained in the proxy statement for Cyan’s 2015 Annual Meeting of Stockholders, which was filed with the SEC on April 2, 2015. You can obtain a free copy of this document at the SEC’s website at www.sec.gov or by accessing Cyan’s website at investor.cyaninc.com/investors/sec-filings/default.aspx. Information regarding Ciena’s executive officers and directors is contained in the proxy statement for Ciena’s 2015 Annual Meeting of Stockholders filed with the SEC on February 11, 2015. You can obtain a free copy of this document at the SEC’s website at www.sec.gov or by accessing Ciena’s website at www.ciena.com. Additional information regarding the interests of those persons and other persons who may be deemed participants in the proposed transaction may be obtained by reading the joint proxy statement/prospectus regarding the proposed transaction when it becomes available. You may obtain free copies of this document as described in the preceding paragraph.

Investor Relations Contact

The Blueshirt Group, Maria Riley

+ 1 707.283.2850 | ir@cyaninc.com