US5017885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical amplifier with reduced nonlinearity
Assignee: Nokia Bell Labs
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Filing: 1990-09-28
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Granted: 1991-05-21
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Expires: 2010-09-28
Abstract
Abstract An improved optical amplifier is disclosed with reduced signal-induced, deleterious, nonlinear effects, such as crosstalk, inter-modulation distortion and other saturation-induced effects. The invention comprises an optical amplifier with a compensation loop, such as a feed-forward or a feed-backward loop. This loop provides additional pumping to the gain medium associated with the amplifier, thereby compensating for what would otherwise be deleterious, signal-induced variations in the gain of the optical amplifier.
Inventors
- 👤 Adel A. M. Saleh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:03
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/50; H03F1/02; H03F1/0205; H03F1/0261; H03F1/0266; H03F3/00; H03F3/04; H03F3/08; H03F3/087; H03F2200/00; H03F2200/192; H03F2200/276
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
An optical amplifier comprising, (a) an optical gain medium, (b) means for coupling light into the optical gain medium, (c) means for coupling light out of the optical gain medium, and (d) means for coupling pumping energy into the optical gain medium, The Invention Characterized in that the amplifier further comprises a compensation loop which provides additional gain to the amplifier gain medium as the light coupled into the optical gain medium increases, whereby, signal-induced variations in the gain of the optical amplifier are reduced.
Claim 2
Dependent Claim
85 words
An optical amplifier comprising, (a) an optical gain medium, (b) means for coupling light into the optical gain medium, (c) means for coupling light out of the optical gain medium, and (d) means for coupling pumping energy into the optical gain medium, The Invention Characterized in that the amplifier further comprises a compensation loop which provides additional gain to the amplifier gain medium as the light coupled into the optical gain medium increases, whereby, signal-induced variations in the gain of the optical amplifier are reduced.
Claim 3
Dependent Claim
36 words
The device of claim 1 wherein the compensation loop is a feed-forward loop between the means for coupling light into the optical gain medium and the means for coupling pumping energy into the optical gain medium.
Claim 4
Dependent Claim
37 words
The device of claim 1 wherein the compensation loop is a feedback loop between the means for coupling light out of the optical gain medium and the means for coupling pumping energy into the optical gain medium.
Claim 5
Dependent Claim
15 words
The device of claim 1 wherein the compensation loop has a substantially flat frequency response.
Claim 6
Independent Claim
19 words
The device of claims 1 wherein said additional gain is responsive to variations in the instantaneous optical signal power.
Claim 7
Dependent Claim
12 words
The device of claim 1 wherein the optical amplifier comprises a semiconductor.
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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) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |