KPN EURORINGS CHOOSES CIENA'S ONLINE METRO PLATFORM TO PROVIDE HIGH-VALUE SERVICES TO PAN EUROPEAN CUSTOMERS

Pan-European Unit of Dutch Incumbent Telecom Provider Utilizes CIENA LightWorks Services to Consolidate Networks and Extend Data Services

Linthicum, MD — 06/18/2003

Ciena® Corporation (NASDAQ: CIEN), a leading provider of global network solutions, today announced that the KPN EuroRings unit of KPN, the Netherlands’ largest telecom service provider, has deployed Ciena's ONLINE Metro™ platform in its network. The platform allows KPN EuroRings to offer higher value data services, such as Storage Area Networking (SAN), ESCON, Fibre Channel, wavelength services and Gigabit Ethernet, to its expanding European customer base.

Consolidating its existing infrastructure with Ciena's ONLINE Metro solution will create greater capacity, flexibility and increased service capability in a single network. KPN EuroRings customers, including carriers and internet service providers (ISPs), will benefit from a range of new services including network performance monitoring, automated service provisioning, outstanding SAN protocol transport solutions and protection management.

"By implementing Ciena's ONLINE Metro platform and ON-Center™ management software, KPN will ensure that its extension into Europe is fully supported by a strong network infrastructure that has the capacity to grow as the market evolves," said Nick Jeffery, Ciena’s managing director, EMEA. "Strengthening its existing networks means that KPN can rapidly introduce reliable, high-value services as its growing customer base demands. For Ciena, this deal is another strong illustration that our strategy of focusing on the world’s largest carriers is working.”

Ciena has discussed extensively during the past several quarters that adding the world’s largest incumbent carriers as customers is the centerpiece of its corporate plan. Adding KPN’s EuroRings unit to a customer base that now includes leading global service providers, such as the UK’s BT, Mexico’s TELMEX and AT&T, is validation of the Company’s strategy.

Ciena recently launched its LightWorks™ Services initiative, which focuses on improving service profitability for carriers. As part of the initiative, Ciena is introducing a series of product enhancements and new products focused on network automation, data-centric features on existing platforms and new, edge service delivery products. KPN EuroRings will be able to take advantage of the benefits of the automation and efficiency that LightWorks Services enables.

As part of the solution, KPN EuroRings will implement Ciena's LightWorks ON-Center network management software, which will allow the rapid deployment of new revenue-generating features, such as 10-Gigabit Ethernet, rapidly and efficiently. The ON-Center architecture is based on open standards and smart information modeling, which will allow for the easy integration of new services into the KPN EuroRings network.


About Ciena

Ciena specializes in network transition. We provide the flexible platforms, intelligent software and professional services to build converged networks for enhanced services and applications. With a growing global presence, Ciena leverages its heritage of practical innovation to deliver maximum performance and economic value in communications networks worldwide. For more information, visit www.ciena.com.
ABOUT KPN

KPN is a telecommunications company offering a wide range of high quality and innovative telecommunications services for both the private and business markets. Its core business activities are mobile communications, fixed networks, Internet services and IP/Data services.

Note to Investors

This press release contains certain forward-looking statements based on current expectations, forecasts and assumptions of Ciena (the Company) that involve risks and uncertainties. Forward-looking statements in this release, including but not limited to Ciena’s relationship with KPN EuroRings, are based on information available to the Company as of the date hereof. The Company’s actual results could differ materially from those stated or implied in such forward-looking statements, due to risks and uncertainties associated with the Company’s business, which include the risk factors disclosed in the Company’s Report on Form 10-K filed with the Securities and Exchange Commission on May 22, 2003. Forward looking statements include statements regarding the Company’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. The Company assumes no obligation to update the information included in this press release, whether as a result of new information, future events or otherwise.

Press Contacts:
Nicole Anderson
Ciena Corporation
(877) 857 -7377
pr@ciena.com
Investor Contacts:
Marie Downing
Ciena Corporation
(888) 243-6223
ir@ciena.com