LUMINOUS NETWORKS SIGNS WORLDWIDE RESELLER AGREEMENT WITH CIENA

CIENA to Deliver Luminous Products to Telecom Service Providers Worldwide, Partnership to Accelerate Luminous Networks’ Growth in the Marketplace

LINTHICUM, Md & CUPERTINO, Calif — 09/25/2003

Luminous Networks, a leading provider of multiservice transport platforms that support voice, data, video, and wavelength services, and Ciena® Corporation (NASDAQ: CIEN), a leading global provider of innovative network solutions, announced today that the companies have signed a worldwide reseller agreement. Under the agreement, Ciena will market, sell and support Luminous Networks’ entire PacketWave family of products. This partnership expands Luminous’ worldwide sales presence and further extends Ciena’s networking capabilities.

Luminous also announced today that Ciena has made a strategic investment in the company. For more information, see Luminous Networks’ press release: “Luminous Networks Raises $25 Million in Series-E Round of Funding.”

Supporting Ciena’s LightWorks™ Services portfolio strategy, this partnership further enhances Ciena’s set of comprehensive network solutions designed to help service providers capitalize on data and traditional service markets efficiently and profitably.

Luminous Networks’ PacketWave products, which can efficiently aggregate data traffic and provide cost-effective support for TDM services, are interoperable with Ciena solutions, including ONLINE Metro™, ONLINE Edge™, CoreDirector® and the DN family of multiservice switches. The work necessary to integrate PacketWave into Ciena’s ON-Center® Management Suite is already underway.

“Luminous’ platform complements Ciena’s LightWorks architecture,” said Gary Smith, president and CEO of Ciena. “As Ciena continues its push toward more access-focused, multiservice solutions for converged networks, PacketWave extends our reach while enabling a more comprehensive overall solution for pull-through opportunities. We look forward to working with Luminous in answering the network needs of our current and future customers.”

“Our partnership with Ciena is proof positive of the quality and strength of our products in the marketplace,” said Alex Naqvi, president and CEO of Luminous Networks. “Luminous products have been deployed and are supporting live traffic in more than 50 networks worldwide. Through our relationship with Ciena, we expect to significantly increase our footprint and penetrate a broader customer base.”

Luminous’ PacketWave platform further enhances the ability of Ciena solutions to enable revenue-generating services for telecommunications carriers and cable service providers throughout their networks — from the edge to the core. PacketWave’s packet-based architecture significantly reduces transport and operational costs, since it carries voice, data and video services over a single network with a common management and provisioning system.


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 LUMINOUS NETWORKS
Luminous Networks is redefining the economics of metropolitan area networks with the industry's first carrier-class, packet-based multiservice transport platform that supports voice, data, video, and wavelength services. The company's innovative PacketWave optical access switches, based on Resilient Packet Ring (RPR) technology, enable delivery of Ethernet data services, toll-quality voice, and interactive video services on a single, efficient platform. Luminous is shipping products for revenue to major telecommunications carriers, cable service providers, and enterprise customers in the US and international markets. Luminous can be found on the web at www.luminous.com. Luminous Networks, the Luminous mark, Luminous Management System, and PacketWave are trademarks of Luminous Networks, Inc. All other trademarks used herein are the property of their respective owners.
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 the features and benefits of Ciena’s products, 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-Q filed with the Securities and Exchange Commission on August 21, 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 Mary Ann Gallo
Luminous Networks
(408) 342-6448
mgallo@luminous.com
Investor Contacts:
Marie Downing
Ciena Corporation
(888) 243-6223
ir@ciena.com