Patent US2371768A successfully refreshed from Google Patents.
Patent US5157683A successfully refreshed from Google Patents.
US5157683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser systems
Assignee: British Telecommunications PLC
•
Filing: 1989-08-30
•
Granted: 1992-10-20
•
Expires: 2009-08-30
Abstract
Abstract The invention relates to laser systems of the type comprising optical fibre amplifiers. A laser system comprises a first laser 1 and a second laser 2. The second laser 2 is pumped at a first wavelength lambda 1 and caused to lase at a second wavelength lambda 2. The first laser 1 has absorption bands at lambda 1 and lambda 2. The output lambda 2 of laser 2 and the remnant pump at lambda 1 are coupled and both are used to pump the first laser 1, thus causing laser 1 to lase at a third wavelength lambda 3.
Inventors
- 👤 Colin A. Millar
- 👤 Jonathan R. Armitage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:32
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/09; H01S3/091; H01S3/094
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
55 words
A laser system comprising: a first laser pumpable at a first and second wavelength; a second laser pumpable at the first wavelength and generating a laser output at the second wavelength wherein the output of the second laser at the second wavelength and the remnant pump at the first wavelength both pump the first laser.
Claim 2
Dependent Claim
55 words
A laser system comprising: a first laser pumpable at a first and second wavelength; a second laser pumpable at the first wavelength and generating a laser output at the second wavelength wherein the output of the second laser at the second wavelength and the remnant pump at the first wavelength both pump the first laser.
Claim 3
Dependent Claim
20 words
A system according to claim 1 wherein the first laser is a single mode optical fibre doped with rare-earth ions.
Claim 4
Dependent Claim
20 words
A system according to claim 2 wherein the first laser is a silica based optical fibre doped with erbium ions.
Claim 5
Dependent Claim
19 words
A system according to claim 1 wherein the second laser comprises a fluorozirconate based laser doped with erbium ions.
Claim 6
Dependent Claim
15 words
A system according to claim 4 wherein the second laser is a single mode fibre.
Claim 7
Dependent Claim
22 words
A system according to claim 1, wherein the second laser is a silica based fibre doped with both neodymium and ytterbium ions.
Claim 8
Dependent Claim
25 words
The system according to claim 1, wherein the first laser is efficiently pumped at the second wavelength to provide optical gain to an input signal.
Claim 9
Dependent Claim
52 words
The system according to claim 3 wherein the second laser is pumped at a wavelength of 800 nm and the first laser is pumped by both the second laser output and the remnant pump at wavelengths of 980 nm and 800 nm, respectively, such that the first laser lases at 1540 nm.
Claim 10
Dependent Claim
50 words
An optical fiber amplifier system comprising: first and second lasers connected in series wherein the first laser is pumped with the output of the second laser and the remnant pump of the second laser such that the first laser is pumped at a wavelength having substantially no excited state absorption.
Claim 11
Dependent Claim
50 words
An optical fiber amplifier system comprising: first and second lasers connected in series wherein the first laser is pumped with the output of the second laser and the remnant pump of the second laser such that the first laser is pumped at a wavelength having substantially no excited state absorption.
Claim 12
Dependent Claim
16 words
The system according to claim 9 wherein the first laser efficiently amplifies an optical input signal.
Claim 13
Dependent Claim
15 words
The system according to claim 9 wherein said first and second lasers are longitudinally pumped.
Claim 14
Dependent Claim
30 words
The system according to claim 9 wherein the second laser is pumped at a first wavelength and the first laser is pumped at the first wavelength and a second wavelength.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |