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Laurel Networks Closes $20 Million Third Round of Funding;
Signs Reseller Agreement with Primary Investor CIENA

September 10, 2003 - Pittsburgh, PA
Laurel Networks, Inc., the first provider of high-performance service edge routers, today announced that it has closed a $20 million third round of funding, bringing total investment in the company to $102.3 million. The new participant in the third round is primary investor CIENA® Corporation (NASDAQ: CIEN). This fund raising is inclusive of funds raised under a separate transaction between Optovation Corporation and Laurel Networks. Existing investors New Enterprise Associates (NEA), Trinity Ventures and Worldview Technology Partners also participated in this latest round of funding.

In addition to CIENA's investment in Laurel, the companies also jointly announced that they have entered into a worldwide reseller agreement that gives CIENA the ability to market, sell and support Laurel's ST200™ Service Edge Router to service providers across the globe. (See today's press release: CIENA Signs Reseller Agreement with Laurel Networks).

"Laurel's ST200 Service Edge Router uniquely supports applications experiencing growth in key global markets, such as IP VPNs and next-generation broadband deployment," said Jim Collier, CIENA's senior vice president, corporate development. "Their IP edge capabilities provide a significant complementary addition to our growing LightWorks™ portfolio, further expanding our ability to support efficiency and profitability for new and existing services on carrier networks."

"This is a key milestone for Laurel. We have a leading product, a growing list of customers and now the further investment and strategic partnerships required to rapidly grow our market presence in the service edge router market category we created," said Atul Bansal, president and CEO of Laurel Networks. "This latest round of funding coupled with our global reseller and support agreement with CIENA puts us in a strong position to further expand our global sales, support and manufacturing presence."

About the ST200 Service Edge Router
The flagship product of Laurel Networks, the ST200 Service Edge Router is the only router designed from the ground up with the features required at the edge of a service provider IP/MPLS backbone. The ST200 combines Internet-class routing, complete multi-service support, integrated service management and unprecedented architecture flexibility to support current and evolving service provider requirements - all at wire speed.

About Laurel Networks
Laurel Networks is leading the creation of The New Service Delivery Architecture to enable profitable delivery of data and IP services at the edge of carrier IP/MPLS networks. Laurel's service edge routers and service management software are evolving carrier architectures from multiple data networks to a single packet-switched architecture with minimal capital investment. Combining carrier-class routing, data switching, advanced QoS and high availability, Laurel service edge routers support both routed and switched services. This unmatched service agility allows carriers to evolve their service portfolio to meet changing market requirements. Laurel Networks was founded in 1999 and is headquartered in Pittsburgh, Pennsylvania. For more information, visit www.laurelnetworks.com.

About CIENA
CIENA Corporation delivers innovative network solutions to the world's largest service providers, increasing the cost-efficiency of current services while enabling the creation of new carrier-class data services built upon the existing network infrastructure. Additional information about CIENA can be found at www.ciena.com.

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