The manufacturing process consists of major steps, including glass deposition, preform fabrication, and fiber drawing, shown schematically below: Each step applies specialized techniques to realize the stringent requirements of optical signal transmission over transcontinental. The manufacturing process consists of major steps, including glass deposition, preform fabrication, and fiber drawing, shown schematically below: Each step applies specialized techniques to realize the stringent requirements of optical signal transmission over transcontinental. Multi-core optical fiber, with its ability to transmit multiple signals simultaneously, has emerged as a promising solution to meet this demand. Additionally, due to its characteristics such as multi-channel transmission, high integration, spatial flexibility, and versatility, multi-core optical. The production of optical fiber is a precision-driven process that transforms raw materials like silicon tetrachloride into ultra-thin, high-performance fibers capable of transmitting terabits of data over thousands of kilometers. Over 50. In this report, we introduce the research and development trends of MCF manufacturing technology reported so far from the viewpoint of improving the manufacturability for the practical use of MCF. These materials form the backbone of the optical fiber, significantly influencing its performance.