Optical communication system employing raman amplification
AssigneeFujitsu Limited
InventorToshikazu Ueki
Life of this patent
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Abstract
An optical communication system employing Raman amplification includes a plurality of first optical fibers each having a first nonlinear effective cross sectional area and each coupled to a terminal station or a repeater in a transmission line between the terminal station and the repeater or between two repeaters, a second optical fiber having a second nonlinear effective cross sectional area larger than the first nonlinear effective cross sectional area and coupled between two first optical fibers. The Raman amplification is made in the transmission line by pumping in two directions from the two repeaters coupled to both ends of the transmission line or from the terminal station and the repeater.
Claims20
An optical communication system employing Raman amplification, comprising:
- a plurality of first optical fibers, each having a first nonlinear effective cross sectional area, and each coupled to a terminal station or a repeater in a transmission line between the terminal station and the repeater or between two repeaters;
- a second optical fiber, having a second nonlinear effective cross sectional area larger than the first nonlinear effective cross sectional area, and coupled between two first optical fibers,
- the Raman amplification being made in the transmission line by pumping in two directions from the two repeaters coupled to both ends of the transmission line or from the terminal station and the repeater.
An optical communication system employing Raman amplification, comprising:
- a plurality of first optical fibers, each having a first nonlinear effective cross sectional area, and each coupled to a repeater in a transmission line between two repeaters;
- a second optical fiber, having a second nonlinear effective cross sectional area larger than the first nonlinear effective cross sectional area, and coupled between two first optical fibers;
- a plurality of third optical fibers, each having the first nonlinear effective cross sectional area, and each coupled to a repeater in a transmission line between a terminal station and the repeater;
- and
- a fourth optical fiber, having the second nonlinear effective cross sectional area, and coupled between two third optical fibers,
- the Raman amplification being made in the transmission line between the two repeaters by pumping in two directions from the two repeaters coupled to both ends of the transmission line.
Dependencies are inferred from the claim text.