| 摘要 |
PURPOSE:To provide the laser beam breaking system automatically and immediately cutting off the laser beam sent from a light transmitting terminal equipment at the occurrence of abnormality in the power supply system due to the damage of submarine cable, etc., in the photo submarine communication system having a light transmitting terminal equipment, power supply device and common device. CONSTITUTION:When the feed current or voltage to be monitored in a power supply device 50 exceeds a prescribed value, a CPU 21 of a light transmitting terminal equipment 10 stops driving of the laser diode of an A-system light transmitting device OS-A22 and B-system transmitting equipment OS-B23 by the firmware control of a CPU 61 of a common device 60. Thus, the laser light can be cutoff. The security of an inspector's body can be protected. |
