Dispersion compensating optical fiber and optical transmission system including such fiber

摘要

A dispersion compensating fiber has a negative chromatic dispersion slope and a value of chromatic dispersion suitable for practical application, and a bending loss thereof with a bending diameter of 40 mm is smaller than 0.01 dB/m at 1.55 mu m. A diameter of a core (3) is larger than 3 mu m but smaller than 4 mu m. A ratio (Da/Db) of the diameter of the core (3) to an outer diameter of a first cladding (1) is between 0.4 and 0.6 both inclusive. A relative refractive index difference of the core (3) to a second cladding (2), (nc - n2)/n2, is larger than 0.02 but smaller than 0.03. A relative refractive index difference of the first cladding (1) to the second cladding (2), (n2 - n1)/n2, is larger than 0.004 but smaller than 0.01. This dispersion compensating optical fiber has a sufficient negative chromatic dispersion slope at wavelengths (1.55 mu m to 1.65 mu m both inclusive) around 1.55 mu m and a bending loss thereof at the wavelength of 1.55 mu m with the bending diameter of 40 mm is smaller than 0.01 dB/m.