Waveform shaping apparatus, optical transmission system, and waveform shaping method
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United States of America Patent
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Apr 23, 2013
Grant Date -
Sep 25, 2008
app pub date -
Feb 28, 2008
filing date -
Mar 19, 2007
priority date (Note) -
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Abstract
A waveform shaping apparatus includes a quantum dot optical amplifier in which an amplification factor of input signal beams saturates if the optical power of the signal beams is equal to or greater than a predetermined value; and a quantum dot saturable absorber in which an absorption factor of the input signal beams saturates if the optical power of the signal beams is under a predetermined value. The quantum dot optical amplifier and the quantum dot saturable absorber are connected in series with a transmission path of the signal beams, and shape the waveform of the signal beams. Voltages applied to the quantum dot optical amplifier and the quantum dot saturable absorber, respectively, are adjusted based on the optical power of the signal beams.
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