| 摘要 |
A method and an apparatus are provided to demultiplex an optical signal havi ng a plurality of channels at a predetermined channel spacing having demultiplexi ng means with a frequency spacing larger than the predetermined channel spacing for receiving the optical signal and for dividing the optical signal by wavelength into a plurality of wavelength streams broader than the predetermined channel spacing, time doma in demultiplexing means for receiving one of the plurality of wavelength stream s and for dividing the one of the plurality of wavelength streams into a plurality of time domain demultiplexed wavelength streams, and optical filtering means for demultiplexing one of the plurality of time domain demultiplexed wavelength streams into a single channel. Advantageously, splitting means are provided to split the optical signal int o sub-signals before launching them into the demultiplexing means.
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