World’s First: Kyocera and Tohoku University Develop Technology to Integrate Optical Isolators Directly onto Silicon Photonics Chips*1

KYOTO, Japan, September 10, 2026–Kyocera Corporation (President: Shiro Sakushima; “Kyocera”) and the Research Institute of Electrical Communication (RIEC), Tohoku University (Director: Kazushi Ishiyama; “Tohoku University”) have developed a new technology*1 for integrating optical isolators onto silicon photonics chips using “laser annealing,” a localized, laser-based heat-treatment method.An optical isolator is a component that stabilizes optical communication by allowing optical signals to be