Photonics Electronics Technology Research Association(PETRA) has developed the world\’s first three-dimensional optical wiring technology that integrates an optical IC and an LSI, as a result of the “Integrated Photonics-Electronics Convergence System Technology” (project leader: Yasuhiko Arakawa, specially appointed professor of the University of Tokyo) promoted by the New Energy and Industrial Technology Development Organization (NEDO). Through the development of a three-dimensional micromirror and other means, the distance between the electrical wiring of the LSI and the optical IC has been reduced to an absolute minimum, enabling the transmission of next-generation standard optical signals of 112 gigabits per second at temperatures of over 80 degrees Celsius. This is expected to result in a significant power saving of 30-40% compared to previous state-of-the-art technologies. The results were presented by PETRA at OECC (Optoelectronics and Communications Conference) 2021, an international conference on optical communications held from Saturday 3 July.