TY - JOUR AU - 전성호 DA - 2017/08 PY - 2017 UR - https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-24-6720 UR - https://repository.hanyang.ac.kr/handle/20.500.11754/72264 AB - We report on a bidirectional free-space optical system that is capable of automatic connection and tracking of an optical link between two nodes. A piezoelectric micro-electro-mechanical systems (MEMS) optical scanner is used to steer a laser beam of two wavelengths superposed to visually present a communication zone, to search for the position of the remote node by means of the retro-reflector optics, and to transmit the data between the nodes. A feedback system is developed to control the MEMS scanner to dynamically establish the optical link within a 10-ms transition time and to keep track of the moving node. (C) 2017 Optical Society of America PB - OPTICAL SOC AMER KW - FEMTOSECOND LASER KW - COMMUNICATION TI - MEMS tracking mirror system for a bidirectional free-space optical link IS - 24 VL - 56 DO - 10.1364/AO.56.006720 T2 - APPLIED OPTICS ER -