摘要：

A single-mode optical fiber includes a central core surrounded by an outer optical cladding. The optical fiber includes an inner depressed cladding, a ring, and an outer depressed cladding positioned between the central core and the outer optical cladding. The central core typically has a refractive-index difference (Dn) with the outer optical cladding of between about 0.5×10and 0.5×10. The ring typically has an inner radius (r) of between about 21 microns and 35 microns and a refractive-index difference with the outer optical cladding (Dn) of between about 0.5×10and 0.5×10. The outer depressed cladding typically has a volume (V) of between about 15 μmand 30 μm. The ratio of the volume of the central core over the width of the ring (V/w) is typically between about 0.12 micron and 0.2 micron.

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