LINTHICUM, Md. -- IDC, a leading telecommunications market analyst firm, today released findings of its annual optical networking market share survey, in which it revealed that CIENA® Corporation (NASDAQ: CIEN), a global provider of intelligent optical networking systems and software, has achieved the global leadership position for long-haul dense wavelength division multiplexing (DWDM) system deployment. The results are as of the end of calendar year 2001."In a very challenging environment, CIENA significantly increased its long-haul DWDM revenue and earned top market share in 2001," said Sterling Perrin, Senior Research Analyst with IDC. "Moving forward, IDC believes that DWDM products, such as CIENA's, that address carriers' capacity requirements, lower their capital costs and reduce their operating costs, will continue to be well-received in the market."CIENA, with its flagship CoreStream(tm) long-haul DWDM product, also gained the lead in North American DWDM share with 30 percent of the market. IDCCiena Corp.