Optical short pulse generating device
First Claim
1. An optical pulse generating device, comprising:
- a continuously oscillating semiconductor laser;
a first semiconductor electroabsorption optical modulator for performing intensity modulation of the output light of said semiconductor laser;
a second electroabsorption optical modulator for performing intensity modulation of the output light from said first electroabsorption optical modulator;
a sinusoidal voltage generator for generating a sinusoidal voltage for driving said first and second electroabsorption optical modulators;
a DC voltage generator for applying a DC bias voltage to said first and second electroabsorption optical modulators; and
a delay circuit inserted between said second electroabsorption optical modulator and said sinusoidal voltage generator for delaying said sinusoidal voltage from said sinusoidal voltage generator for a period of time corresponding to its phase reversal.
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Abstract
An optical short pulse generating device is disclosed, in which semiconductor laser light of a fixed intensity is launched into a first semiconductor electroabsorption optical modulator which is driven by a 0V or forward bias voltage and a sinusoidal voltage, and the output light from the first optical modulator is launched into a second electroabsorption optical modulator to which is applied a bias voltage and a sinusoidal voltage having delayed from the said sinusoidal voltage for a period of time corresponding to the phase reversal thereof, whereby it is possible to generate optical short pulses of a repetition frequency twice higher than the oscillation frequency of a sinusoidal voltage generator.
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Citations
3 Claims
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1. An optical pulse generating device, comprising:
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a continuously oscillating semiconductor laser; a first semiconductor electroabsorption optical modulator for performing intensity modulation of the output light of said semiconductor laser; a second electroabsorption optical modulator for performing intensity modulation of the output light from said first electroabsorption optical modulator; a sinusoidal voltage generator for generating a sinusoidal voltage for driving said first and second electroabsorption optical modulators; a DC voltage generator for applying a DC bias voltage to said first and second electroabsorption optical modulators; and a delay circuit inserted between said second electroabsorption optical modulator and said sinusoidal voltage generator for delaying said sinusoidal voltage from said sinusoidal voltage generator for a period of time corresponding to its phase reversal. - View Dependent Claims (2, 3)
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Specification