| 摘要 |
There is provided a pulse shaping apparatus for shaping an input optical pulse (500) into an output optical pulse having substantially constant optical power (100, in Figure 1). The apparatus includes a modulator, which acts upon the input optical pulse (500) under the control of a control signal, and a sampling means, which takes a sample of the incoming optical pulse for further processing. In a feedback configuration, the modulator acts on the incoming pulse under the control of an error signal, the incoming pulse is then sampled, the sample processed and the error signal generated from the processed sample. In a feed-forward configuration, the incoming pulse is sampled first, the sample processed and the modulator acts on the incoming pulse under the control of an error signal resulting from the processing steps. Alternatively, an output optical pulse having substantially constant optical power can be generated by directing the incoming optical pulse through a limiting medium that saturates at a predetermined power level.
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