| 摘要 |
In a wavelength division multiplexed optical transmission system extending from a WDM transmitter (10) to a WDM receiver (12), the transmission path (11) includes a set of optically pumped optically amplifying fibre optical amplifiers (13) arranged optically in series. The amplifying fibres are of the same type, but exhibit a spread of spectral gain characteristics as the result of being operated under different conditions of amplifier length, or pump power and optical input signal, so that the overall variation of gain with wavelength is reduced compared to that which would prevail were all the amplifiers identical. <IMAGE>
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