Patent US2610479A successfully refreshed from Google Patents.
Patent US4840456A successfully refreshed from Google Patents.
US4840456A
Expired / Lapsed
US
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Methods of and apparatus for generation of radio frequency signals
Assignee: Verizon Laboratories Inc
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Filing: 1987-12-28
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Granted: 1989-06-20
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Expires: 2007-12-28
Abstract
Abstract Electrical signals with frequencies ranging from several tens of megahertz to hundreds of gigahertz are generated by detecting the optical output from a novel double-external-cavity diode laser system. The system provides a convenient means of measuring the frequency response of high speed photodetectors, and it can also be used for the optical generation and transmission of microwave or millimeter wave carriers in applications such as phased array radars.
Inventors
- 👤 Donald M. Fye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:13
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/14; H01S5/141; H03; H03B; H03B17/00; H01S3/00; H01S3/05; H01S3/08; H01S3/08086; H01S3/0809; H01S5/06; H01S5/062; H01S5/06226; H01S5/0623
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
187 words
An extremely high frequency electrical generator comprising; means for generating a collimated coherent light beam along a first path; beam splitting means oriented along said first path for splitting said light beam into two components, one of said components being directed along a second path, and the other of said components being directed along a third path, said second and third paths being non-coincident; a first frequency selective element means oriented along said second path for receiving said one component and reflecting back, along said second path, toward said beam splitting means, light at the wavelength λ 1 ; a second frequency selective element means oriented along said third path for receiving said other component and reflecting back, along said third path, toward said beam splitting means, light at the wavelength λ 2 ; whereby said beam splitting means combines said light at said wavelengths λ 1 and λ 2 along a fourth path; and a photodetecting means oriented along said fourth path for receiving light at said wavelengths λ 1 and λ 2 and for providing electrical signals at the wavelength, |λ 1 -λ 2 |.
Claim 2
Dependent Claim
187 words
An extremely high frequency electrical generator comprising; means for generating a collimated coherent light beam along a first path; beam splitting means oriented along said first path for splitting said light beam into two components, one of said components being directed along a second path, and the other of said components being directed along a third path, said second and third paths being non-coincident; a first frequency selective element means oriented along said second path for receiving said one component and reflecting back, along said second path, toward said beam splitting means, light at the wavelength λ 1 ; a second frequency selective element means oriented along said third path for receiving said other component and reflecting back, along said third path, toward said beam splitting means, light at the wavelength λ 2 ; whereby said beam splitting means combines said light at said wavelengths λ 1 and λ 2 along a fourth path; and a photodetecting means oriented along said fourth path for receiving light at said wavelengths λ 1 and λ 2 and for providing electrical signals at the wavelength, |λ 1 -λ 2 |.
Claim 3
Dependent Claim
21 words
The generator as recited in claim 1 wherein said means for generating a collimated coherent light beam comprises: a diode laser.
Claim 4
Dependent Claim
38 words
The generator as recited in claim 2 wherein said diode laser has one end coated with an anti-reflective coating, whereby said coated one end is adapted to provide emission of light therefrom, and means for collimating said light.
Claim 5
Dependent Claim
19 words
The generator as recited in claim 3 wherein one of said frequency selective element means is a diffraction grating.
Claim 6
Dependent Claim
18 words
The generator as recited in claim 4 wherein both of said frequency selective element means are diffraction gratings.
Claim 7
Dependent Claim
19 words
The generator as recited in claim 2 wherein one of said frequency selective element means is a diffraction grating.
Claim 8
Dependent Claim
18 words
The generator as recited in claim 6 wherein both of said frequency selective element means are diffraction gratings.
Claim 9
Dependent Claim
19 words
The generator as recited in claim 1 wherein one of said frequency selective element means is a diffraction grating.
Claim 10
Dependent Claim
17 words
The generator as recited in claim 8 wherein both of said frequency selective means are diffraction gratings.
Claim 11
Dependent Claim
16 words
The generator as recited in claim 1 wherein all of said paths are independent and non-coincident.
Claim 12
Dependent Claim
17 words
The generator as recited in claim 1 wherein said first path and said fourth path are co-aligned.
Claim 13
Independent Claim
151 words
A method of generating extremely high frequency electrical signals comprising the steps of: generating a collimated coherent light beam along a first path; splitting said beam along said first path into two components, one of said components being directed along a second path, and the other of said components being directed along a third path, said second and third paths being non-coincident; receiving said one component along said second path and reflecting back, along said second path, a frequency selected wavelength λ 1 ; receiving said other component along said third path and reflecting back, along said third path, a frequency selected wavelength λ 2 , whereby said light at said wavelengths λ 1 and λ 2 are combined along a fourth path; and photodetecting light at said wavelengths λ 1 and λ 2 along said fourth path, and providing electrical signals at the wavelength |λ 1 and λ 2 |.
Claim 14
Independent Claim
151 words
A method of generating extremely high frequency electrical signals comprising the steps of: generating a collimated coherent light beam along a first path; splitting said beam along said first path into two components, one of said components being directed along a second path, and the other of said components being directed along a third path, said second and third paths being non-coincident; receiving said one component along said second path and reflecting back, along said second path, a frequency selected wavelength λ 1 ; receiving said other component along said third path and reflecting back, along said third path, a frequency selected wavelength λ 2 , whereby said light at said wavelengths λ 1 and λ 2 are combined along a fourth path; and photodetecting light at said wavelengths λ 1 and λ 2 along said fourth path, and providing electrical signals at the wavelength |λ 1 and λ 2 |.
Claim 15
Dependent Claim
17 words
The method as recited in claim 12 wherein said light beam is generated by a diode laser.
Claim 16
Dependent Claim
46 words
The method as recited in claim 13 wherein said diode laser has a pair of ends, said method further comprising: coating one of said ends with an anti-reflective coating whereby said coated one end is adapted to provide emission of light therefrom, and collimating said light.
Claim 17
Dependent Claim
22 words
The method as recited in claim 14 wherein one of said frequency selected wavelengths is obtained by positioning of a diffraction grating.
Claim 18
Dependent Claim
23 words
The method as recited in claim 15 wherein each of said frequency selected wavelengths is obtained by positioning of a respective diffraction grating.
Claim 19
Dependent Claim
22 words
The method as recited in claim 13 wherein one of said frequency selected wavelengths is obtained by positioning of a diffraction grating.
Claim 20
Dependent Claim
23 words
The method as recited in claim 17 wherein each of said frequency selected wavelengths is obtained by positioning of a respective diffraction grating.
Claim 21
Dependent Claim
22 words
The method as recited in claim 12 wherein one of said frequency selected wavelengths is obtained by positioning of a diffraction grating.
Claim 22
Dependent Claim
23 words
The method as recited in claim 19 wherein each of said frequency selected wavelengths is obtained by positioning of a respective diffraction grating.
Claim 23
Dependent Claim
14 words
The method as recited in claim 12 wherein said paths are independent and non-coincident.
Claim 24
Dependent Claim
17 words
The method as recited in claim 12 wherein said first path and said fourth path are co-aligned.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |