Patent US5434693A successfully refreshed from Google Patents.
US5434693A
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US
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Optical short pulse generating device
Assignee: KDDI Corp
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Filing: 1994-03-16
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Granted: 1995-07-18
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Expires: 2014-03-16
Abstract
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.
Inventors
- 👤 Hideaki Tanaka
- 👤 Satoru Takagi
- 👤 Masatoshi Suzuki
- 👤 Yuichi Matsushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/50; G; G02; G02F; G02F1/00; G02F1/01; G02F1/0121; G02F1/015; G02F1/0155; G02F1/0157; G02F2203/00; G02F2203/26; G02F2203/54
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
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.
Claim 2
Dependent Claim
120 words
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.
Claim 3
Dependent Claim
23 words
An optical pulse generator device according to claim 1, in which said DC voltage generator generates the DC bias voltage of zero volt.
Claim 4
Dependent Claim
31 words
An optical pulse generator device according to claim 1, in which said DC voltage generator generates a forward DC bias voltage as the DC bias voltage with respect to said modulators.
References Cited (Backward Citations)
US5325225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |