Optical transmission apparatus and optical systems

An optical cross-connect equipment comprising:

• (1) an optical switch having a plural number of input ports and a plural number of output ports, for exchanging connections between said input ports and said output ports;
• (2) a first transmission apparatus, having:
• a first wavelength demultiplexer for dividing an input optical signal applied thereto into a supervisory optical signal and a wavelength multiplexed input signal;
• a supervisory optical signal receiver for receiving said supervisory optical signal, to extract an input supervisory information therefrom;
• and
• a second wavelength demultiplexer for dividing said wavelength multiplexed input signal into optical signals, each having a separate wavelength, thereby to connect the optical signals to the different input ports of said optical switch, respectively;
• (3) a second transmission apparatus, having;
• a first wavelength multiplexer for wavelength multiplexing the optical signals from the plural number of output ports of said optical switch, to form a multiplexed wave form output;
• a supervisory optical signal transmitter for converting an output supervisory information into the supervisory optical signal;
• and
• a second wavelength multiplexer for multiplexing said wavelength multiplexed output signals and said supervisory optical signal, thereby to provide an output optical signal of the second transmission apparatus;
• and
• (4) a controller for inputting the input supervisory information obtained in said first transmission apparatus and for outputting the output supervisory information to said second transmission apparatus.