US4152045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical waveguide with prism coupler for parallel light
Assignee: RCA Corp
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Filing: 1977-10-03
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Granted: 1979-05-01
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Expires: 1997-10-03
Abstract
Abstract Couplers for coupling achromatic light having wavelengths of blue through red to and from an optical film waveguide along collinear paths parallel with the waveguide. Each coupler is constituted by a prism made of a material which, over the range of wavelengths of interest, has a change in refractive index which differs from the change in refractive index of the waveguide film by less than 0.5 percent of the refractive index of the prism material.
Inventors
- 👤 Jacob M. Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:21
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
Means for coupling achromatic light having wavelengths within a given range to or from an optical waveguide along a path parallel with the waveguide, comprising an optical waveguide film on a substrate, and a prism having a base on said waveguide film and having a face positioned in said path and at an angle θ with said base, said prism being made of a material having a refractive index n p which is higher than the refractive index n g of the waveguide, and having a dispersive behavior substantially equal to the dispersive behavior of the material of the waveguide film.
Claim 2
Dependent Claim
101 words
Means for coupling achromatic light having wavelengths within a given range to or from an optical waveguide along a path parallel with the waveguide, comprising an optical waveguide film on a substrate, and a prism having a base on said waveguide film and having a face positioned in said path and at an angle θ with said base, said prism being made of a material having a refractive index n p which is higher than the refractive index n g of the waveguide, and having a dispersive behavior substantially equal to the dispersive behavior of the material of the waveguide film.
Claim 3
Dependent Claim
19 words
Means as defined in claim 1 wherein said range of wavelengths includes the wavelengths of blue through red light.
Claim 4
Dependent Claim
52 words
Means as defined in claim 1 wherein, over the range of light wavelengths of interest, the change in refractive index n p of the prism material differs from the change in refractice index n g of the waveguide film material by less than 0.5 percent of the refractive index of the prism.
Claim 5
Dependent Claim
17 words
Means as defined by claim 1 wherein said angle θ is in accordance with the formula: ##EQU3##
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |