OPTICAL FIBER FOR WAVELENGTH DIVISION MULTIPLEXING OPTICAL TRANSMISSION SYSTEM USING DENSELY SPACED OPTICAL CHANNELS

摘要

Disclosed is an optical fiber having a desired dispersion value t sufficiently suppress a non-linearity phenomenon, that is, a four-wave mixing phenomenon, occurring at a channel spacing of 50 GHz while minimizing the expense consumed for a compensation for dispersion. The optical fiber satisfies optical characteristics defined by dispersion value of 7-10 ps/nm-km at a wavelength of 1,550 nm, a zero dispersion wavelength of 1,450 nm or less, and a cut-off wavelength of 1,250 nm or less. The optical fibers includes a core having a desired diameter (d^ and a desired refractive index (n^, the cladding surrounding the core and having a refractive index (nci). The (n2) of the inner cladding may also be less than the (nO of the core and more than the (nd) of the outer cladding.