| 摘要 |
The invention relates to a dispersion-shifted single-mode fiber having cladding of given refractive index (ns) and a fiber core having an index profile that is in the shape of a trapezium, a triangle, or a rectangle, together with a first ring, the index profile of the fiber core having an outer, second ring of index (n3) greater than the index of said cladding (ns), said fiber being characterized in that the index (n3) of said second ring is greater than or equal to the index (n2) of said first ring. The invention provides better control over the wavelength at which chromatic dispersion is zero, while conserving the other transmission characteristics of known fibers, such as mode diameter and attenuation.
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