Fibers for Optical Communications


  • Dr. Shiro Takahashi

    Corresponding author
    1. NTT Optoelectronics Laboratories Tokai, Ibaraki 319-11 (Japan)
    Current affiliation:
    1. HOYA Corporation, 3-3-1 Musashino Akishima, Tokyo 196 (Japan)
    • NTT Optoelectronics Laboratories Tokai, Ibardki 319-11 (Japan)
    Search for more papers by this author
    • received his B.E. and M.E. degrees in applied chemistry from Waseda University, Tokyo, in 1967 and 1969, respectively. He was awarded a Dr.E. degree for work in the area of optical fiber technology by the same university in 1980. On joining the NTT Electrical Communication Laboratories in 1969 he carried out ceramics research. Since 1971 he has been engaged in developmental research on the characteristics of optical fibers and their fabrication techniques for both silica-based and non-silica-based glass fibers. He is a leader of the non-crystalline solids research group at the NTT Optoelectronics Laboratories.


Low-loss optical fibers based on silica now have a transmission loss value approaching the theoretical limit, and thus attention has turned to other materials. Fibers for optical communications are reviewed in general, and the methods of loss reduction in silica-based fibers are discussed. Advanced materials and new processing technologies are described for active fibers, in which the light is intentionally modified as it propagates along the fiber, as well as for ultra-low-loss passive fibers.