Patent ID: 6684017
Filing Date: 2004-01-27
Classification: G02B,H04B

Abstract:
An optical transmission line for a repeatered transmission line having a span length of L disposed between stations, said optical transmission line comprising a single-mode optical fiber and a dispersion-compensating optical fiber, said single-mode optical fiber having a zero-dispersion wavelength in a 1.3-&mgr;m wavelength band, said dispersion-compensating optical fiber being disposed at a position where signals outputted from said single-mode optical fiber reach and compensating for a chromatic dispersion of said single-mode optical fiber;said optical transmission line as a whole having an average dispersion slope Save of âˆ’0.0113 ps/nm2/km or more but 0.0256 ps/nm2/km or less at a wavelength of 1550 nm, and an equivalent effective area EAeff of 50 &mgr;m2 or more at the wavelength of 1550 nm; said average dispersion slope Save and said equivalent effective area EAeff satisfying the relationship of: f(Save)&lE;EAeff&lE;g(Save) where f(Save) is a lower limit function which yields the lower limit of EAeff by the expression:942Ã—Save+0.609Ã—L+45.7 while using the average dispersion slope Save and the span length L as variable, and g(Save) is an upper limit function which yields the upper limit of EAeff by the expression:885Ã—Save+0.609Ã—L+60.7 while using the average dispersion slope Save and the span length L as variable.