UNIDIRECTIONALLY OPTICAL SIGNAL MONITORING UNIT

摘要

Disclosed is a unidirectional optical signal monitoring unit. The present invention relates to a unidirectional optical signal monitoring unit including an optical receiving module. The optical receiving module includes a first photodiode part which receives a constant quantity of an optical signal emitted from a first fiber corresponding to a monitoring object, a second photodiode part which receives a constant quantity of an optical signal emitted from a second fiber not corresponding to the monitoring object, an output part which outputs an electric signal generated according to the constant quantity of the optical signal received from the first photodiode part, and a signal removing part which removes an electric signal generated according to the constant quantity of the optical signal received from the second photodiode. So, a change in the intensity of the beam can be accurately detected.