| 摘要 |
<p>There are provided a dispersion compensating optical fiber that reduces dispersion in the 1.5 mu m- and 1.3 mu m-wavelength bands and an optical transmission line using the optical fiber. A first side core (2), a second side core (3), and a cladding (5) are disposed in this order on the outer side of a center core (1). The relationship among a comparative refractive index difference DELTA 1 of the center core (1) to the cladding (5), a comparative refractive index difference DELTA 2 of the first side core (2) to the cladding (5), and a comparative refractive index difference DELTA 3 of the second side core (3) to the cladding (5) is set to be DELTA 1> DELTA 3> DELTA 2 wherein 0.8%</= DELTA 1</=1.3%, -0.5</= DELTA 2/ DELTA 1</=-0.35, and 0.2%</= DELTA 3</=0.3%, and the diameter ratio among the center core (1), the first side core (2), and the second side core (3) is set to be 1:2 through 2.5:2.5 through 3.5. The dispersion compensating optical fiber is connected to a single-mode optical fiber, and the dispersion value in the 1.5 mu m-wavelength band of the connected optical fiber is set to be -1 ps/nm/km through 1 ps/nm/km, and the dispersion value in the 1.3 mu m-wavelength band of the connected optical fiber is set to be -5 ps/nm/km through 5 ps/nm/km.</p> |
