US4962985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective coatings for optical devices comprising Langmuir-Blodgett films
Assignee: Nokia Bell Labs
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Filing: 1989-10-02
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Granted: 1990-10-16
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Expires: 2009-10-02
Abstract
Abstract A semiconductor optical device, such as a photodetector or a semiconductor laser, is sealed by a Langmuir-Blodgett film that intercepts the optical path extending from the device. The film is less than one-thirtieth of a wavelength at the operating optical frequency, which precludes interference with transmitted light waves.
Inventors
- 👤 Jane D. LeGrange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:55
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/84; G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; H01; H01S; H01S5/00; H01S5/02; H01S5/028; H10F; H10F77/00; H10F77/30; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
An optical communication system comprising: a first optical device adapted to be optically coupled to a second optical device by light of a predetermined optical frequency transmitted along an optical path extending between the first and second optical devices; said first optical device being of a type that is susceptible to deterioration if exposed over a period of time to atmospheric contaminants; means comprising a Langmuir-Blodgett film convering at least part of the first optical device for sealing said first optical device, thereby preventing water vapor molecules and other atmospheric contaminants from contacting the first optical device; said Langmuir-Blodgett film extending across said optical path; said Langmuir-Blodgett film having a thickness of less than one-thirtieth the wavelength of said light at said optical frequency.
Claim 2
Dependent Claim
124 words
An optical communication system comprising: a first optical device adapted to be optically coupled to a second optical device by light of a predetermined optical frequency transmitted along an optical path extending between the first and second optical devices; said first optical device being of a type that is susceptible to deterioration if exposed over a period of time to atmospheric contaminants; means comprising a Langmuir-Blodgett film convering at least part of the first optical device for sealing said first optical device, thereby preventing water vapor molecules and other atmospheric contaminants from contacting the first optical device; said Langmuir-Blodgett film extending across said optical path; said Langmuir-Blodgett film having a thickness of less than one-thirtieth the wavelength of said light at said optical frequency.
Claim 3
Dependent Claim
16 words
The optical communication system of claim 1 wherein: said first optical device is a semiconductor photodetector.
Claim 4
Dependent Claim
16 words
The optical communication system of claim 1 wherein: said first optical device is a semiconductor laser.
Claim 5
Dependent Claim
16 words
The optical communication system of claim 1 wherein: said Langmuir-Blodgett film consists of a polyimide composition.
Claim 6
Dependent Claim
16 words
The optical communication system of claim 4 wherein: said first optical device is a semiconductor photodetector.
Claim 7
Dependent Claim
16 words
The optical communication system of claim 4 wherein: said first optical device is a semiconductor laser.
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