Abstract

Dispersion-shifted single-mode fibers operated in the 1.5-μm region, where silica-based fibers exhibit the lowest loss and zero chromatic dispersion simultaneously, are extremely attractive for high-bit-rate transmission systems with a long repeater spacing. Recently, several research institutions have reported structure designs of dispersion-shifted single-mode fibers based on a triangular-index profile core to reduce microbending sensitivity.^1,2 These designs require a high level of GeO₂, which leads to increased Rayleigh scattering loss. The fiber structure with a cladding depressed by adding fluorine can reduce the level of GeO₂ but results in a leakage loss increase of the fundamental mode.

© 1986 Optical Society of America