| 摘要 |
An optical amplification unit (1) comprises at least one optical amplifier (2) for amplifying an optical signal and a filter (7) preceding or following the optical amplifier (2). The optical amplifier comprises a first measuring device (4) for measuring a property of an input signal of the optical amplifier (2), a second measuring device (5) for measuring a property of an output signal of the optical amplifier (2), and a control circuit (6) for controlling a gain characteristic of the optical amplifier (2) in dependence of said input and output signal properties. The filter (7) exhibits a wavelength-dependent attenuation of the optical signal. The optical amplification unit (1) is connectable to an optical fiber span (8) and the filter (7) is adapted to compensate for a span loss tilt caused by said optical fiber span (8). An optical transmission system with at least one such optical amplification unit (1) and corresponding methods.
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