JDS Uniphase Corporation (JDSU) is a provider of communications test and measurement solutions and optical products for telecommunications service providers, cable operators, and network equipment manufacturers. The Company is also a provider of optical solutions for biomedical and environmental instrumentation, semiconductor processing, aerospace and defense, brand authentication, visual display and custom color product differentiation applications. The Company operates in three segments: Communications Test and Measurement (CommTest), which accounted for approximately 47% of net revenue, during the fiscal year ended June 27, 2009 (fiscal 2009); Communications and Commercial Optical Products (CCOP), which accounted for approximately 37% of net revenue in fiscal 2009; and Advanced Optical Technologies (AOT), which accounted for approximately 16% of net revenue in fiscal 2009. In July 2009, the Company acquired Network Tools business of Finisar Corporation.