| 摘要 |
<p>The invention relates to a dispersion compensating optical fiber which is connected to an optical fiber having a positive dispersion value at wavelength band of 1.55 mu m and concurrently has a function of compensating dispersion of optical fibers having a positive dispersion value and a function acting as an optical transmission line, and relates to a wavelength division multiplexing optical transmission line using the dispersion compensating optical fiber. The refractive index profile of the dispersion compensating optical fiber is determined to be W-shaped. 1.0%≤ DELTA 1≤1.4% and -0.45≤ DELTA 2/ DELTA 1≤-0.285 are established where the relative refractive index difference of said center core (1) with respect to said cladding (3) is DELTA 1, and the relative refractive index difference of said side core (2) with respect to said cladding (3) is DELTA 2, and further 0.4≤Ra≤0.5 is established where the value Ra (Ra=a/b) of the outer diameter a of the center core (1) with respect to the outer diameter b of the side core (2) is Ra. The dispersion slope at a wavelength of 1.55 mu m is negative, and the dispersion value sigma is -50ps/nm/km≤ sigma <-20ps/nm/km, wherein the transmission loss is 0.25dB/km or less, the polarization mode dispersion value is 0.15ps/km<1/2> or less, and the mode field diameter is 5.5 mu m or more. <IMAGE></p> |
