With the development of modern communication technology, satellite communication has grown rapidly in recent years. The applications of communication and navigation satellites have been increasingly explored and partially commercialised. The well-known SpaceX satellite system, for example, is primarily used to provide broadband and communication services to individual, commercial, institutional, governmental and professional users around the world. Low Earth Orbit (LEO) satellite communications offer flexible, cost-effective solutions for remote areas, providing information support services for marine operations, scientific research, aviation, disaster response and other scenarios. This enables seamless global coverage and reduces communication blind spots.
      The unique environmental conditions in space, such as a high vacuum, strong radiation, strong magnetic fields and extreme temperature fluctuations, impose specific requirements and challenges on the selection of materials for space communications.
      Changjin's radiation-resistant erbium-doped fibre, based on MCVD technology, achieves stable output even under a total dose of 30–100 krad thanks to unique co-doped ion optimisation. Offering high environmental reliability and low radiation sensitivity, it provides excellent product solutions for applications in extreme radiation environments, such as space exploration and nuclear power plant monitoring.