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Xiaojun brings to AdTech an industrial and research experience in semiconductor optoelectronic materials and devices that spans 20 years. Currently, he is the Director of Chip Development at AdTech, managing the MOCVD material growth and device fabrication for high-performance Mid-Infrared Quantum Cascade Lasers. He joined AdTech since 2003, and focused on the developments of Near-Infrared high-power laser diodes and DFB/EML for telecom/data communications applications during his first three years. Prior to AdTech, Xiaojun was with Nortel Networks from 2000 to 2002 as a senior device engineer, developing the 1310nm single mode pump laser and MEMS/VCSEL based C/L band high power tunable laser. From 1998 till 2000, he was a Research Scientist in University of Maryland Baltimore County, working on InP-based optical components for communication applications. He conducted research on 980nm and 808nm high power lasers, and GaN LED on GaAs in the Institute of Semiconductors, Chinese Academy of Sciences (ISCAS), during his Ph.D. thesis study and the post-doctoral period from 1992 to 1997.