| 摘要 |
PURPOSE:To instantaneously isolate the faults in an optical line and a transmitter by transferring light to an outgoing conductor when the insertion conductor of the light to be tested is an incoming conductor, and to the incoming conductor in an opposite case, taking out the light by means of a photocoupler installed on the inner side of a station in the same conductor, receiving it in a light receiver and isolating the fault in the optical line and the transmitter in accordance with the presence or absence of the light. CONSTITUTION:The light is demultiplexed by the photocoupler 4 inserted into the outgoing conductor, and it passes through an optical filter for interrupting communication light 10, where the light is subjected to phometry by a light receiver 9. When the fault such as breaking is present in the optical line, the light cannot be received and it is detected to be the line fault. Then, the light is reflected by the optical filter 7 and inserted into an optical fiber for test light transmission 5c. The optical fiber 5c is connected to the other side and it forms a loop between the incoming and outgoing conductors on the light. Thus, the fault can instantaneously be isolated by an operation from inside the station. |
