Cross-connection of wavelength-division-multiplexed high speed optical channels

A cross-connection device comprising:

• first and second input ports for being supplied with respective wavelength-division-multiplexed optical signals;
• a first optical circulator having a first port, a second port, and a third port, said first port being connected to the first input port, for outputting an optical signal supplied to said first port from said second port, outputting an optical signal supplied to said second port from said third port, and outputting an optical signal supplied to said third port from said first port;
• a second optical circulator having a first port, a second port, and a third port, said first port being connected to the second input port, for outputting an optical signal supplied to said first port from said second port, outputting an optical signal supplied to said second port from said third port, and outputting an optical signal supplied to said third port from said first port;
• fiber grating mirror connected between the second port of said first optical circulator and the second port of said second optical circulator, for reflecting an optical signal having a selected wavelength and transmitting optical signals having other wavelengths;
• a first output port connected to the third port of said first optical circulator;
• a second output port connected to the third port of said second optical circulator;
• and
• wavelength controller for setting said selected wavelength to a predetermined wavelength.