| 摘要 |
An optical network comprises a transmitter node ( 1 ), a receiver node ( 4 ) and an optical fibre ( 3 ) for transmitting an optical wavelength-division multiplex signal having payload channels and a supervisory channel between the nodes ( 1, 4 ). At least one of the nodes has an amplifier ( 8, 13 ) which is passed by the multiplex signal. The transmitter node ( 1 ) has a source ( 11 ) for the supervisory channel and a multiplexer ( 12 ) for combining the payload channels and the supervisory channel in order to form the optical wavelength-division multiplex signal, and the receiver node ( 4 ) has a sink ( 16 ) for the supervisory channel and a demultiplexer ( 14 ) for separating the wavelengthdivision multiplex signal into supervisory and the payload channels. The multiplexer ( 12 ) and the demultiplexer ( 14 ) are adapted to insert and extract, respectively, as the supervisory channel, a wavelength into/from the optical multiplex signal, the attenuation of which between source ( 11 ) and sink ( 16 ) is essentially the same in the pumped and unpumped states of the amplifier ( 8, 13 ).
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