Optical transmission line and optical transmission system using optical transmission line

   
   

Disclosed is an optical transmission line having a length L of 30 km to 150 km, preferably 30 km to 70 km, an absolute value of a dispersion not smaller than 8 ps/nm/km at a wavelength of 1.55 .mu.m at every point of the optical transmission line, a maximum accumulated dispersion not larger than 7.5.times.L (ps/nm) at a wavelength of 1.55 .mu.m, and a dispersion for the entire optical transmission line of -5 to +5 ps/nm/km at a wavelength of 1.55 .mu.m. The optical transmission line is formed by, for example, combination of a positive dispersion optical fiber and a negative dispersion optical fiber.

 
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