Abstract
We present a first direct experimental observation of dynamic frequency chirp associated with the turn-on spike in the output of a Fabry–Perot semiconductor laser amplifier. Such a frequency chirp exists because of the change in the refractive index at the onset of light injection due to carrier saturation. The experimental observation is made by using a novel technique to optically isolate the turn-on spike from the steady-state response level. Using this technique, we have also successfully demonstrated conversion of a high duty-cycle data stream to a low duty-cycle data stream of the same frequency, which could have potential applications in optical time division multiplexing.
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