| 摘要 |
A method of conveying a WDM optical signal through a WDM system includes demultiplexing the received WDM optical signal into two or more spectral bands. Each spectral band has a respective predetermined center frequency an d bandwidth, which encompasses a respective portion of the transmission window of a communications link. Each spectral band is then independently conveyed through the WDM system. This arrangement provides a flexible banded MUX/DEMU X architecture that enables multiple different channel plans (spectral grids) to co-exist within a common optical communications network. Legacy equipment ca n therefore continue in service, as traffic is gradually migrated onto new, higher capacity systems. This provides a convenient migration path for netwo rk service providers to progressively upgrade the information carrying capacity of network links, without stranding legacy equipment.
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