| 摘要 |
Future optical WDM networks will require optical network elements capable of extracting and inserting individual wavelengths from/into the multiplex signal or of switching the individual wavelengths. Such an optical network element contains optical receivers and optical transmitters which are designed respectively to receive and transmit a predetermined wavelength and are connected to a space switching matrix which is arranged between the receivers and the transmitters and serves to selectively switch digital signals received in the individual wavelengths. In an optical network element according to the invention, a further optical transmitter is provided which is likewise connected to the space switching matrix and carries out a reclocking and restructuring of a frame-structured digital signal to be transmitted, so that the multiplex units internested in the transport frames in accordance with a multiplex hierarchy are embedded in fixed columns of restructured frames which do not change from one frame to the next.
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