400G Ultra-Fast Transmitting/receiving Optical Engine (IMAGE) National Research Council of Science & Technology Caption ETRI researchers are inspecting semiconductor light source chips used in 400G ultra-fast transmitting/receiving optical engine. Credit Electronics and Telecommunications Research Institute (ETRI) Usage Restrictions The sources of photos and research results from ETRI must be specified. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.