G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 6/02 (2006.01) G02B 1/00 (2006.01) H04B 10/12 (2006.01) H04B 10/18 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2356712
The present invention resides in an optical fiber able to form an optical transmitting line for wavelength division multiplexing transmission in a wavelength band of 1.5 µm using a Raman amplifier, and an optical communication system using this optical fiber. The optical fiber has an effective core area from 40 µm2 to 60 µm2 in a set wavelength band of at least one portion of a wavelength band of 1.5 µm; a dispersion value from 4 to 10 ps/nm/km at a wavelength of 1.55 µm; a dispersion slope set to a positive value equal to or smaller than 0.04 ps/nm2/km in a wavelength band of 1.55 µm; and a zero dispersion wavelength equal to or smaller than 1.4 µm. Further, a cutoff wavelength is set to be equal to or smaller than 1.5 µm at a length of 2 m, and a bending loss is set to be equal to or smaller than 5 dB/m at a diameter of 20 mm in the wavelength band of 1.5 µm. In a refractive index profile of the optical fiber, for example, a relative refractive index difference .DELTA.1 of a first glass layer as an innermost layer with respect to a reference layer, and a relative refractive index difference .DELTA.3 of the refractive index of a third glass layer as a third layer from an inner side with respect to the reference layer are set to be positive. Further, a relative refractive index difference .DELTA.2 of a second glass layer as a second layer from the inner side with respect to the reference layer is set to be negative.
Kumano Naomi
Mukasa Kazunori
Freedman & Associates
The Furukawa Electric Co. Ltd
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