Patent ID: 6031955
Filing Date: 2000-02-29
Classification: G02B,H04B

Abstract:
A dispersion compensating optical fiber having a W-type refractive index profile in which a side core having a refractive index lower than a refractive index of a center core is disposed so as to surround the center core, a cladding having a refractive index lower than the refractive index of the center core but higher than the refractive index of the side core is disposed so as to surround the side core and a dispersion value is not more than -80, said dispersion compensating optical fiber being connected to a transmission single-mode optical fiber having zero dispersion in a 1.3 .mu.m wavelength band,wherein a ratio DPS(SMF)/DPS(DCF) is a value within a range of not less than 0.95 and not more than 1.05 by setting a ratio a/b of a diameter a of the center core to a diameter b of the side core within a range of not less than 0.33 and not more than 0.37, wherein a value DPS(SMF) is obtained by dividing a dispersion value of the transmission single-mode optical fiber in a 1.55 .mu.m wavelength band by a dispersion slope of the transmission single-mode optical fiber in the 1.55 .mu.m wavelength band, and wherein a value DPS(DCF) is obtained by dividing a dispersion value of the dispersion compensating optical fiber in the 1.55 .mu.m wavelength band by a dispersion slope of the dispersion compensating optical fiber in the 1.55 .mu.m wavelength band.