| 摘要 |
PROBLEM TO BE SOLVED: To provide a means which increases or decreases the multiplexing number of waveforms for a space division photo switching device or wavelength/ space division photo switching device, using wavelength multiplexing. SOLUTION: Optical signals, inputted from an optical transmission line 10 for input and having wavelength λ0-λ7, are multiplexed by means of an optical multiplexer 31 and inputted to an optical wavelength router 6. The wavelength- multiplexed optical signals having the wavelengths λ0, λ2, λ4, and λ6 and those having the wavelengths λ1, λ3, λ5, and λ7 are respectively outputted from the output ports o0, o2 and o1, o3 of the router 6. A space division optical switch 32 is composed of a 4×16 optical cross-bar switch which can make multicasting up to 1:16. An optical wavelength selector 33 selects an optical signal having a desired wavelength from the wavelength-multiplexed optical signals, outputted from the switch 32 and having four wavelengths and sends the selected optical signal to an optical transmission line 11 for output. |
