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.
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