| 摘要 |
PURPOSE:To control a signal light output according to the detachment and connection of a connector by monitoring a reflected light from a signal light or a monitor light from a connector edge face, detecting an absolute reflected amount or a relative reflected amount from the reflected light strength, and comparing it with a threshold value. CONSTITUTION:This device is equipped with an electric/optic converting part 11, optical amplifier 12, optical fiber cable 13, connector 14, optical coupler 15, reflected light strength detecting circuit 16 which detects the light strength (absolute reflected amount) of the reflected light, threshold value comparator circuit 17 which compares the reflected light strength with a prescribed threshold value (a signal light output shutdown threshold value and a signal light output recover threshold value), and outputs a control signal according to the result, and signal light output control circuit 18 which controls the signal light output of the optical amplifier 12. Then, when the connector 14 is connected, the reflected amount of the signal light is decreased, and when it is less than the prescribed threshold value the reflected amount of the signal light is decreased. Then, the signal light output is set a prescribed level. When the connector 14 is detached, the signal light output is decreased. |
