| 摘要 |
Parallel-formatted information is selectively removed and inserted in a wavelength division multiplexed network by transporting the parallel-formatted information using selected wavelength channels in a wavelength division multiplexed signal as a parallel bus (a "wavelength bus") and by selectively adding and dropping only information in the wavelength bus at an add/drop node. In one illustrative embodiment, one or more wavelength channels in a wavelength division multiplexed signal are allocated to form a wavelength bus for carrying multiplexed information supplied by one or more sources in a parallel format. At an add/drop node in the network, the wavelength channels in the wavelength bus are separated from the wavelength division multiplexed signal and information to be dropped is selectively removed by demultiplexing the parallel-formatted information. Information to be added at the add/drop node is multiplexed in a parallel format for transmission via the wavelength bus in the wavelength division multiplexed signal. A wavelength division multiplexed signal can be partitioned into multiple wavelength buses so that one or more wavelength buses can be used for carrying information that is to be added and dropped at one or more nodes, while other information can be separately routed in the wavelength division multiplexed signal on a "normal through" basis.
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