Research activities on optical fiber transmission technology in Japan are reviewed. Extremely low loss properties have been found in step-index multimode and single mode fibers at longer wavelengths, such as 1.2 millimicrons and 1.5 millimicrons. A perturbation theory was successfully adapted to analyzing the transmission characteristics of multimode fibers. Improvement in GaAlAs laser diode lifetime is in progress & oscillation mode selection has been studied to achieve better diode characteristics. Semiconductor and lithium-neodymium-tetraphosphate lasers operating at the longer wavelengths, fiber splicing and connectors and repeaters are also reviewed.

  • Corporate Authors:

    Telecommunications Association

    New Yurakucho Building, 1-11 Yurakucho, Chiyado-ku
    Tokyo 100,   Japan 
  • Authors:
    • Shimada, S
    • Koyama, M
    • KIMURA, T
  • Publication Date: 1977-4

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00173577
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Apr 26 1978 12:00AM