| 摘要 |
Disclosed is a dispersion compensating optical fiber that includes a core surrounded by a cladding layer of refractive index DELTAc. The core includes at least three radially adjacent regions, a central core region having DELTA1, a moat region having a refractive index DELTA2 and an annular ring region having a refractive index DELTA3, such that DELTA1 >DELTA3>DELTAc>DELTA2. The fiber exhibits a dispersion slope which is less than -1.0 ps/nm2/km over the wavelength range 1525 to 1565, a dispersion at 1550 which is less than -30 ps/mn/km, and a kappa value obtained by dividing the dispersion value by the dispersion slope which is greater than 35 and preferably between 40 and 100.
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