| 摘要 |
In the present invention, wavelength division multiplexed transmission line functions of chromatic dispersion compensation and channel drop are performe d by a node having a concatenated series of wavelength selective dispersion compensating elements (F1-F3) and switches (S1-S4). The switches (S1-S4) are arranged to select or bypass each wavelength selective dispersion compensati ng element (F1-F3). If a wavelength selective dispersion compensating element ( F1- F3) is appropriately selected, the corresponding channel (1-3) is dispersion compensated and reflected to a drop port (3). Any remaining channels are circulated by the switches (S1-S4) to the remaining dispersion compensating elements (F1-F3) where they are dispersion compensated and reflected to an optical output (5). In the preferred examples, the node includes an insert port (6) to allow multiplexing of additional channels. This allows the node to perform both drop and insert functions in addition to dispersion compensatio n and so forms a dispersion compensating drop and insert node. |
