Patent ID: 6577385
Filing Date: 2003-06-10
Classification: G01M

Abstract:
An optical time-domain reflectometer (OTDR) comprising:a light-emitting element for emitting pulsating measuring light when driven, branching means for applying the measuring light from the light-emitting element to an optical fiber to be measured, and for branching light supplied from the optical fiber, light-receiving means for receiving the light branched out by the branching means and detecting a level of the light received, detecting means for detecting a level of the light supplied from the optical fiber after the OTDR is connected to the optical fiber, while not-driving the light-emitting element, and processing means for driving the light-emitting element only when the level of the light detected by the detecting means is equal to or lower than a preset value, when the optical fiber is not serving as a communication line.