| 摘要 |
PROBLEM TO BE SOLVED: To prevent a dispersion value in a light receiving station from being affected when a transmission line is cut out in the transmission line adjusted with the dispersion value in the relay section of the transmission line, and the transmission line is cut into. SOLUTION: The transmission line is constituted of a positive dispersion fiber and a negative dispersion fiber, and as an optical fiber used for the purpose of cutting into the transmission line, the optical fiber whose absolute value of its dispersion is smaller than the positive dispersion fiber or the negative dispersion fiber is used. |
