Patent US5378664A successfully refreshed from Google Patents.
US5378664A
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Optical fiber amplifier and a glass therefor
Assignee: Furukawa Electric North America Inc
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Filing: 1993-06-24
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Granted: 1995-01-03
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Expires: 2013-06-24
Abstract
Abstract A chalcogenide glass that is doped with praseodymium and contains a rare earth metal is disclosed. The rare earth metal is at least 10 mole percent of the metals in the glass. The concentration of the praseodymium in the glass is at least 200 ppm. The chalcogenide glass, when formed into an amplifier for an optical fiber transmission system, efficiently amplifies optical signals in the signal band of 1.3 μm.
Inventors
- 👤 Philippe C. Becker
- 👤 Allan J. Bruce
- 👤 David J. DiGiovanni
- 👤 Vincent G. Lambrecht, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:07
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06708; C; C03; C03C; C03C3/00; C03C3/32; C03C3/321; H01S3/14; H01S3/16; H01S3/1601; H01S3/1603; H01S3/1613
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
A chalcogenide glass comprising: about 200 ppm to about 2000 ppm praseodymium, a second rare earth metal wherein the second rare earth metal is not praseodymium, at least one other metal that promotes glass formation and prevents the rare earth metals from separating from the molten phase during glass formation, and sulfur wherein the total rare metal content of the chalcogenid glass is at least 10 mole percent of the metals in the glass.
Claim 2
Dependent Claim
74 words
A chalcogenide glass comprising: about 200 ppm to about 2000 ppm praseodymium, a second rare earth metal wherein the second rare earth metal is not praseodymium, at least one other metal that promotes glass formation and prevents the rare earth metals from separating from the molten phase during glass formation, and sulfur wherein the total rare metal content of the chalcogenid glass is at least 10 mole percent of the metals in the glass.
Claim 3
Dependent Claim
23 words
The glass of claim 1 wherein the second rare earth metal is selected from the group consisting of lanthanum, yttrium, ytterbium and lutetium.
Claim 4
Dependent Claim
20 words
The glass of claim 2, wherein the other metal is selected from the Group 3A metals of the Periodic Table.
Claim 5
Dependent Claim
21 words
The glass of claim 3 wherein the Group 3A metal is selected from the group consisting of gallium, aluminum and indium.
Claim 6
Dependent Claim
12 words
The glass of claim 4 wherein the Group 3A metal is gallium.
Claim 7
Dependent Claim
24 words
The glass of claim 4 wherein the glass further comprises a second other metal that prevents significant crystal formation when the glass is formed.
Claim 8
Dependent Claim
12 words
The glass of claim 6 wherein the second other metal is germanium.
Claim 9
Dependent Claim
31 words
The glass of claim 1 wherein the glass has a highest prevalent phonon energy derived from the elemental vibrations of the glass that is less than about 400 cm -1 .
Claim 10
Dependent Claim
13 words
The glass of claim 1 wherein the glass emits in 1.3 μm region.
References Cited (Backward Citations)
FR2223319A1
Cited
US4962995A
Cited
US5244846A
Cited
JPH04333029A
Cited
JPH0563285A
Cited
JPH0563284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |