Abstract

32 Mbit/sec transmission for a distance of 53.3 km without any repeaters in the line was reported.^1,2 This proved experimentally the feasibility of a nonrepeating system several tens of kilometers long using very-low-loss fibers.³ The important optical characteristics of the fiber cables are attenuation and dispersion, because they determine to a large extent the repeater spacing and the transmission capacity of the fiber. To realize a wide-band optical fiber, the profile of a graded-index fiber must be optimized in the low-loss-wavelength region. Fibers having an optimum profile at 1.27 µm are manufactured in cables whose loss increase due to cabling is negligibly small. We describe the results of transmission experiments using low-loss and wide-band fiber cables, InGaAsP-InP LD or LED, and Ge-APD.

© 1979 Optical Society of America