US3739173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlaced multiplexing electro optical system
Assignee: Thales SA
•
Filing: 1971-02-05
•
Granted: 1973-06-12
•
Expires: 1991-02-05
Abstract
Abstract A double diffraction optical system associated with a monochromatic light source, with optical-electrical modulating means and with photoelectric detector means, for effecting the interlaced spectral multiplexing or demultiplexing of a plurality of electrical signals.
Inventors
- 👤 G Broussaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:16
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32; G02B27/00; G02B27/42; G02B27/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
A spectral demultiplexing electro-optical system for demultiplexing a multiplexed electrical signal whose frequency spectrum comprises interlaced spectral bands respectively belonging to the frequency spectra of N electrical signals, N being an integer at least equal to two, said system comprising : a monochromatic radiant energy source emitting a beam ; an electro-optical modulator positioned for modulating said beam, said modulator having a control input for receiving said multiplexed signal ; a first diffracting system having an input positioned for receiving the radiant energy emerging from said modulator ; an optical filter positioned for receiving the diffracted energy emerging from said first diffracting system ; said optical filter comprising a plurality of parallel slots transmitting selected portions of the diffracted energy emerging from said first diffracting system, and optical spreader means facing said slots in order to project onto a plane parallel to said slots, enlarged images thereof ; a second diffracting system positioned for receiving the radiation emerging from said plane ; and photo-electric means positioned for receiving the radiant energy emerging from said second diffracting system.
Claim 2
Dependent Claim
177 words
A spectral demultiplexing electro-optical system for demultiplexing a multiplexed electrical signal whose frequency spectrum comprises interlaced spectral bands respectively belonging to the frequency spectra of N electrical signals, N being an integer at least equal to two, said system comprising : a monochromatic radiant energy source emitting a beam ; an electro-optical modulator positioned for modulating said beam, said modulator having a control input for receiving said multiplexed signal ; a first diffracting system having an input positioned for receiving the radiant energy emerging from said modulator ; an optical filter positioned for receiving the diffracted energy emerging from said first diffracting system ; said optical filter comprising a plurality of parallel slots transmitting selected portions of the diffracted energy emerging from said first diffracting system, and optical spreader means facing said slots in order to project onto a plane parallel to said slots, enlarged images thereof ; a second diffracting system positioned for receiving the radiation emerging from said plane ; and photo-electric means positioned for receiving the radiant energy emerging from said second diffracting system.
Claim 3
Dependent Claim
16 words
A spectral demultiplexing device as claimed in claim 1, wherein said enlarged images are arranged side-by-side.
Claim 4
Dependent Claim
34 words
A spectral demultiplexing device as claimed in claim 1, wherein said optical spreader means comprise, facing each of said slots, a pair of lenses capable of projecting an enlarged erect image of the slot.
Claim 5
Dependent Claim
32 words
A spectral demultiplexing device as claimed in claim 3, wherein said lenses compriSe a plate of refractive material having at least one fluted face ; said plate being integral with said filter.
Claim 6
Dependent Claim
19 words
A spectral demultiplexing device as claimed in claim 3, wherein said lenses are holographic lenses integral with said filter.
Claim 7
Dependent Claim
28 words
A spectral demultiplexing device as claimed in claim 3, wherein said lenses are cylindrical lenses ; the curved faces of said lenses having generatrices parallel to said slots.
Claim 8
Dependent Claim
21 words
A spectral demultiplexing device as claimed in claim 1, wherein said radiant energy source is a source of coherent luminous energy.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |