An apparatus and method are disclosed for visualizing an automatic laser
shutdown (ALS) state. An operator is informed of the ALS state by
transmitting a visible light with weak power, to an optical fiber, that
effuses from the cut position of the optical fiber. The operator
recognizes the cut position of the optical fiber by comparing the power of
the ALS visible light reflected from the cut surface of the optical fiber
and that of the transmitting ALS visible light, and thus restores the cut
optical fiber at the recognized position.
