Patent ID: 7164829

Claim:
An optical transmission line comprising: (a) a first optical fiber having: (a1) a chromatic dispersion of at least 4 ps/nm/km and at most 15 ps/nm/km at a wavelength of 1,550 nm; and (a2) a transmission loss of at most 0.190 dB/km at a wavelength of 1,530 to 1,570 nm; and (a3) an effective cutoff wavelength measured by the 2-meter method of 1610 nm or more; and (b) a dispersion-compensating optical fiber that: (b1) is connected to the first optical fiber, the optical transmission line further comprising a second optical fiber that: (a) is connected to the free end of the dispersion-compensating optical fiber; (b) has a chromatic dispersion of at least 4 ps/nm/km and at most 15 ps/nm/km at a wavelength of 1,550 nm; and (c) has a transmission loss of at most 0.190 dB/km at a wavelength of 1,530 to 1,570 nm; the dispersion-compensating optical fiber compensating the chromatic dispersion and dispersion slope of the first and second optical fibers.