| 摘要 |
According to a first aspect of the present invention, there is provided a method for monitoring individual wavelength division multiplexed data channel signals of a multiple data channel optical signal which is being amplified by a gain-clamped optical amplifier, the method comprising the steps of modulating each wavelength division multiplexed data channel signal with an associated lower frequency identification signal before the optical signal is amplified, the frequency of each identification signal being chosen such that it uniquely identifies the associated data channel signal and such that at least a portion of each identification signal is transferred onto a gain-clamping signal of the amplifier, and monitoring each identification signal as a component of the gain-clamping signal. There is also provided a gain-clamped optical amplifier for amplifying a multiple data channel optical signal.
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