Fujikura Limited

Takashi Suzuki

Shoichiro Matsuo

Kazuhiko Aikawa

Akira Wada

Manabu Saitou

Takaaki Suzuki

Koichi Harada

Ryozo Yamauchi

An optical fiber is fabricated with a refractive index profile having a central core; a middle part provided around the outer periphery of the central core and having a lower refractive index than that of the central core; and a cladding provided around the periphery of the middle part and having a higher refractive index than the middle part and a lower refractive index than the central core. This optical fiber has an effective core area of 120 &#x3bc;mor more in an employed wavelength band selected from the range of 1.53&#x2dc;1.63 &#x3bc;m, and has a cut-off wavelength that is capable of substantially single mode propagation in the aforementioned employed wavelength band. As a result, it is possible to construct an optical transmission system having excellent transmission characteristics in which nonlinearity is decreased.

Optical fiber and optical transmission system

In order to provide a dispersion-compensating optical fiber able to be applied over a broad wavelength band, having a large effective area, and as a result, suppressing the occurrence of non-linear effects, the present invention comprises a dispersion-compensating optical fiber that compensates chromatic dispersion of a 1.3 &#x3bc;m single-mode optical fiber over the entire wavelength range of 1.53-1.63 &#x3bc;m characterized in that, chromatic dispersion at a wavelength of 1.55 &#x3bc;m is &#x2212;50 ps/nm/km or less, the dispersion slope is negative over the entire wavelength range of 1.53-1.63 &#x3bc;m, a cutoff wavelength is provided at which there is substantially single-mode propagation, bending loss is 30 dB/m or less, effective area is 20 &#x3bc;mor more, and the absolute value of chromatic dispersion during compensation of the chromatic dispersion of a 1.3 &#x3bc;m single-mode optical fiber serving as the target of compensation is 0.5 ps/nm/km or less.

Dispersion-compensating optical fiber and hybrid transmission line

In order to provide a dispersion-compensating optical fiber able to be applied over a broad wavelength band, having a large effective area, and as a result, suppressing the occurrence of non-linear effects, the present invention comprises a dispersion-compensating optical fiber that compensates chromatic dispersion of a 1.3 &mgr;m single-mode optical fiber over the entire wavelength range of 1.53-1.63 &mgr;m characterized in that, chromatic dispersion at a wavelength of 1.55 &mgr;m is &minus;50 ps/nm/km or less, the dispersion slope is negative over the entire wavelength range of 1.53-1.63 &mgr;m, a cutoff wavelength is provided at which there is substantially single-mode propagation, bending loss is 30 dB/m or less, effective area is 20 &mgr;m or more, and the absolute value of chromatic dispersion during compensation of the chromatic dispersion of a 1.3 &mgr;m single-mode optical fiber serving as the target of compensation is 0.5 ps/nm/km or less.

Growing community of inventors

Sakura, Japan

Takashi Suzuki