We are researching two new technologies for sustainably and economically responding to the exponentially increasing demand for data communications: (i) optical-fiber technology for space-division multiplexing transmission overcoming the capacity limitations of existing optical fiber and. We are researching two new technologies for sustainably and economically responding to the exponentially increasing demand for data communications: (i) optical-fiber technology for space-division multiplexing transmission overcoming the capacity limitations of existing optical fiber and. Optical fiber communication is the digital lifeline of modern society. It powers 5G, cloud computing, and data centers. Yet, single-fiber capacity faces bottlenecks. Traditional technologies struggle to keep up. Spatial Division Multiplexing. Our research on ultra-high-capacity transmission technologies, namely, optical-fiber technology for SDM transmission and high-speed optical transmission with transmission speeds up to terabits (1012 bits) per second, is introduced in this article. 1, to create SDM optical fiber. High-speed optical fiber communication has emerged as a cornerstone technology, enabling ultra-high data rates, long transmission distances, and low latency.