| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent deterioration in transmission characteristics caused by the nonlinear effects of a transmission path due to the increase in channel power, when a cable disconnection fault occurs. <P>SOLUTION: A signal interruption detection means included in a terminal device in each place detects optical signal interruption of a wavelength block unit. Based on the optical signal interruption detected, a section where the interruption occurs is located. Then, a set of terminal devices which should adjust the transmission dummy light according to the section and a wavelength block, and the amount of dummy light adjustment are determined; and a step for transmitting a control signal is provided at the terminal device which should adjust the transmission dummy light, and the control signal is used for adjusting the dummy light intensity by the amount of dummy light adjustment at the wavelength block. <P>COPYRIGHT: (C)2011,JPO&INPIT |
