Patent ID: 9246580
Filing Date: 2016-01-26
CPC Classification: H04B,H04J

Claim Text:
1. An OADM device provided with an optical multiplexing/demultiplexing unit having an optical demultiplexing functional unit for demultiplexing a received light signal and transmitting a light signal via a transmitting port to which an optical patch cable is connected, and an optical multiplexing functional unit for multiplexing a light signal received via a receiving port to which said optical patch cable is connected, wherein said optical multiplexing/demultiplexing unit comprises: a variable optical attenuator for attenuating a light signal into which the received light signal is demultiplexed by said optical demultiplexing functional unit; a modulating circuit for piggybacking an ID number of said corresponding transmitting port onto said light signal by using said variable optical attenuator; an optical reception detector for detecting a light level of the light signal received via said receiving port; a demodulating circuit for extracting the ID number from the light level detected by said optical reception detector; an ID number management unit for determining whether the ID number extracted by said demodulating circuit matches a preset ID number; and a notifying unit for notifying a connection failure occurring in said optical patch cable when said ID number management unit determines that there is a mismatch between the ID number extracted by said demodulating circuit and the preset ID number, wherein when determining that the reception of the light signal is in a break state at said receiving port on a basis of the light level detected by said optical reception detector, said modulating circuit piggybacks the ID number of the corresponding transmitting port onto said light signal.