Patent US4904039A successfully refreshed from Google Patents.
US4904039A
Expired / Lapsed
US
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Electro-optic devices utilizing a sapphire substrate
Assignee: United States Department of the Air Force
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Filing: 1988-11-18
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Granted: 1990-02-27
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Expires: 2008-11-18
Abstract
Abstract The present invention provides improved optical switching and modulation through the use of electrically assisted opto-optical devices and optically assisted electro-optical devices. The modulator and switches 34, 60 are guided wave devices comprising silicon channel waveguides on a sapphire substrate. An optically transparent sapphire substrate 12, 42, 62 is used to allow transmission of short wavelength light through the substrate to operate upon the silicon channels in the area of p-n junctions. This permits the construction of dual control electro-optical devices. These guided wave devices operate on light at wavelengths of 1.3 microns or higher.
Inventors
- 👤 Richard A. Soref
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:41
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/015; G02F1/025; G02F1/29; G02F1/31; G02F1/313; G02F1/3132; G02F1/3133; G02F1/0126; G02F1/0151; G02F1/0152; G02F1/3137; G02F1/3138
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
82 words
An electro-optical device comprising: a transparent sapphire substrate; a silicon layer positioned on said substrate and formed into an optical waveguide; a p-n junction formed in said silicon waveguide for selectively changing the refractive index of said waveguide; a current source for supplying activating energy to said p-n junction; and an optical source positioned for providing a beam of light that is transmitted through said sapphire substrate and into said silicon waveguide in order to change the refractive index of the waveguide.
Claim 2
Dependent Claim
82 words
An electro-optical device comprising: a transparent sapphire substrate; a silicon layer positioned on said substrate and formed into an optical waveguide; a p-n junction formed in said silicon waveguide for selectively changing the refractive index of said waveguide; a current source for supplying activating energy to said p-n junction; and an optical source positioned for providing a beam of light that is transmitted through said sapphire substrate and into said silicon waveguide in order to change the refractive index of the waveguide.
Claim 3
Dependent Claim
24 words
The electro-optical device of claim 1 wherein the beam of light is of a wavelength in the range of 400 nm to 900 nm.
Claim 4
Dependent Claim
16 words
The electro-optical device of claim 1 wherein the optical beam is focused on the p-n junction.
Claim 5
Dependent Claim
40 words
The electro-optical device of claim 1 wherein said optical waveguide comprises two optical waveguide channels having a coupling region comprising both optical waveguide channels and a silicon transfer area therebetween to allow the passage of optical signals between said channels.
Claim 6
Dependent Claim
17 words
The electro-optical device of claim 4 wherein said p-n junction is formed adjacent to said transfer area.
Claim 7
Dependent Claim
16 words
The electro-optical device of claim 4 wherein said optical channels are shaped for single mode operation.
Claim 8
Dependent Claim
32 words
The electro-optical device of claim 1 wherein the device preferably operates as a mode extinction modulator through the use of both the p-n junction and short wavelength light from said optical source.
Claim 9
Dependent Claim
22 words
The electro-optical device of claim 7 wherein said beam of light is focused on said silicon layer adjacent to said p-n junction.
Claim 10
Dependent Claim
39 words
The electro-optical device of claim 1 wherein said p-n junction further comprises ohmic contact electrodes mounted to said optical waveguide for transferring electrical energy from said current source to p type and n type silicon formed on said waveguide.
Claim 11
Dependent Claim
113 words
An electro-optical coupler comprising: a transparent sapphire substrate; a silicon layer positioned on said substrate and formed into two optical channel waveguides having a coupling region comprising parallel optical channels and a silicon signal transfer area there between; a p-n junction formed in said silicon channel waveguides for selectively changing the refractive index of said waveguides; a current source for supplying activating energy to said p-n junction; and an optical source positioned for providing a beam of light that is transmitted through said sapphire substrate and into said silicon waveguides in order to change the coupling coefficient of said channel waveguides to selectively allow the passage of optical signals between said channel waveguides.
Claim 12
Dependent Claim
113 words
An electro-optical coupler comprising: a transparent sapphire substrate; a silicon layer positioned on said substrate and formed into two optical channel waveguides having a coupling region comprising parallel optical channels and a silicon signal transfer area there between; a p-n junction formed in said silicon channel waveguides for selectively changing the refractive index of said waveguides; a current source for supplying activating energy to said p-n junction; and an optical source positioned for providing a beam of light that is transmitted through said sapphire substrate and into said silicon waveguides in order to change the coupling coefficient of said channel waveguides to selectively allow the passage of optical signals between said channel waveguides.
Claim 13
Dependent Claim
24 words
The electro-optical device of claim 10 wherein the beam of light is of a wavelength in the range of 400 nm to 900 nm.
Claim 14
Dependent Claim
16 words
The electro-optical device of claim 10 wherein the optical beam is focused on the p-n junction.
Claim 15
Dependent Claim
21 words
The electro-optical device of claim 10 wherein said p-n junction is formed adjacent to said coupling region of said optical waveguides.
Claim 16
Dependent Claim
22 words
The electro-optical device of claim 10 wherein said optical channel waveguides are shaped for single mode operation except at said coupling region.
Claim 17
Dependent Claim
106 words
An electro-optical switch comprising: a transparent sapphire substrate; a silicon layer positioned on said substrate and formed into crossing optical channel waveguides wherein said optical channel waveguides merge and then separate; a p-n junction formed at the merger of said optical channel waveguides for selectively changing the refractive index of the silicon layer at the junction of said optical waveguides; a current source for supplying activating energy to said p-n junction; and an optical source positioned for providing a beam of light that is transmitted through said sapphire substrate and into said silicon optical waveguides in order to selectively change the refractive index of the waveguides.
Claim 18
Dependent Claim
106 words
An electro-optical switch comprising: a transparent sapphire substrate; a silicon layer positioned on said substrate and formed into crossing optical channel waveguides wherein said optical channel waveguides merge and then separate; a p-n junction formed at the merger of said optical channel waveguides for selectively changing the refractive index of the silicon layer at the junction of said optical waveguides; a current source for supplying activating energy to said p-n junction; and an optical source positioned for providing a beam of light that is transmitted through said sapphire substrate and into said silicon optical waveguides in order to selectively change the refractive index of the waveguides.
Claim 19
Dependent Claim
24 words
The electro-optical device of claim 16 wherein the beam of light is of a wavelength in the range of 400 nm to 900 nm.
Claim 20
Dependent Claim
24 words
The electro-optical device of claim 16 wherein the optical beam is focused on the merger of said optical channel waveguide in an off-center manner.
Claim 21
Dependent Claim
20 words
The electro-optical device of claim 16 wherein said p-n junction is formed adjacent to said junction of said optical waveguides.
Claim 22
Dependent Claim
27 words
The electro-optical device of claim 16 wherein said optical channel waveguides are shaped for single mode operation except at the merger region of said optical channel waveguides.
Claim 23
Dependent Claim
42 words
The electro-optical device of claim 16 wherein said p-n junction further comprises ohmic contact electrodes mounted to said optical channel waveguides for transferring electrical energy from said current source to p type and n type silicon areas formed in said channel waveguides.
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