China Unicom
Chang Cao is a Senior R&D Engineer at China Unicom since April 2012, focusing on DWDM, OTN, mobile backhaul, and SDN research. Prior to this role, Chang Cao served as a Research Scholar at North Carolina State University from August 2010 to December 2011 and was a student at Beijing University of Posts and Telecommunications from 2006 to 2011, where Chang Cao studied as a PhD candidate in Optical Networking.
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China Unicom
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China United Network Communications Group Co., Ltd. (Chinese: 中国联合网络通信集团有限公司) or China Unicom (Chinese: 中国联通) is a Chinese state-owned telecommunications operator of China. China Unicom is the world's fourth-largest mobile service provider by subscriber base.