Optical communication device and optical communication system including the same

An optical communication system comprising:

• a first optical communication device configured to convert an input first signal into a first optical signal and transmit the converted first optical signal, and to convert an input second signal into a second optical signal and transmit the converted second optical signal;
• and
• a second optical communication device connected to the first optical communication device through a first optical line or a second optical line to receive at least one of the first optical signal and the second optical signal,
• wherein the first optical communication device comprises:
• a first channel card configured to convert the first signal into the first optical signal and output the first optical signal to any one of a first MUX/DEMUX connected to the first optical line and a second MUX/DEMUX connected to the second optical line;
• a second channel card configured to convert the second signal into the second optical signal and output the second optical signal to any one of the first MUX/DEMUX and the second MUX/DEMUX;
• and
• a controller configured to monitor states of the first optical line and the second optical line to determine a MUX/DEMUX from which the first optical signal and the second optical signal are respectively output, from among the first MUX/DEMUX and the second MUX/DEMUX.