US3961841A
Expired / Lapsed
US
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Optical pulse position modulator
Assignee: Individual
•
Filing: 1970-09-23
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Granted: 1976-06-08
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Expires: 1990-09-23
Abstract
Abstract An optical pulse position modulator is provided by a diffraction grating (or other optical spectrum resolution device) in combination with a suitable control device, such as a triangular electrooptic prism. This control device introduces a frequency dependent phase shift in the optical pulse which is proportional to the difference between the frequency of each Fourier component of the pulse and the central frequency. Thereby, upon reconstruction of the pulse by reflection back to the diffraction grating, the pulse position is shifted in time according to the controlled phase shift. Such a device has a relatively higher efficiency than conventional optical delay lines for picosecond pulses in the visible region of the spectrum, for example.
Inventors
- 👤 Joseph Anthony Giordmaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0305; H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A pulse position modulation system which comprises: a. first means for producing an angular dispersion of the Fourier frequency components in an optical pulse beam; b. second means for producing a controllable phase shift in said components, which is proportional to the difference in frequency between each of the components and the central frequency of the pulse beam; c. third means for undoing the angular dispersion after the beam has traversed the second means, in order to form an output pulse beam whose position is shifted in accordance with the controllable phase shift.
Claim 2
Dependent Claim
93 words
A pulse position modulation system which comprises: a. first means for producing an angular dispersion of the Fourier frequency components in an optical pulse beam; b. second means for producing a controllable phase shift in said components, which is proportional to the difference in frequency between each of the components and the central frequency of the pulse beam; c. third means for undoing the angular dispersion after the beam has traversed the second means, in order to form an output pulse beam whose position is shifted in accordance with the controllable phase shift.
Claim 3
Dependent Claim
41 words
The system recited in claim 1 in which the first and the third means are provided by a single device, and which further includes fourth means for directing the beam upon the device after the beam has traversed the second means.
Claim 4
Dependent Claim
14 words
The system recited in claim 2 in which the device is a diffraction grating.
Claim 5
Dependent Claim
19 words
The system recited in claim 1 in which the phase shift is linearly proportional to said difference in frequency.
Claim 6
Dependent Claim
28 words
The system recited in claim 4 in which the second means is a wedge shaped transparent medium whose refractive index with respect to said components can be modulated.
Claim 7
Dependent Claim
13 words
The system recited in claim 5 in which the transparent medium is electrooptic.
Claim 8
Dependent Claim
21 words
The system recited in claim 6 which further includes voltage means for controllably varying the said refractive index of the medium.
Claim 9
Dependent Claim
29 words
The system recited in claim 7 which further includes a source of the optical pulse beam and fifth means for utilizing the beam after interaction with the third means.
References Cited (Backward Citations)
US3246557A
Cited
US3492600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |