Patent US5355248A successfully refreshed from Google Patents.
US5355248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical amplifier
Assignee: Nortel Networks Ltd
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Filing: 1993-10-29
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Granted: 1994-10-11
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Expires: 2013-10-29
Abstract
Abstract A diode-pumped fiber amplifier has its amplifying fiber divided into two parts so that light from both ends of a laser diode can be used for pumping. A second diode may be included for redundancy, its outputs being coupled via a pair of polarisation beam splitter/combiners.
Inventors
- 👤 Anagnostis Hadjifotiou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:39
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06754; H01S3/06758; H01S3/09; H01S3/091; H01S3/094; H01S3/09408; H01S5/00; H01S5/06; H01S5/068; H01S5/06825
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
91 words
A diode-pumped optical amplifier, which amplifier includes an optical pump source in the form of an injection laser diode having first and second end facets from which optical pump power is emitted, and including an optically amplifying waveguided transmission medium formed in two parts optically in series with each other, wherein the optical output from the first end facet of the laser diode is optically coupled with the first part of the waveguided transmission medium while the optical output from the second end facet is optically coupled with the second part.
Claim 2
Dependent Claim
91 words
A diode-pumped optical amplifier, which amplifier includes an optical pump source in the form of an injection laser diode having first and second end facets from which optical pump power is emitted, and including an optically amplifying waveguided transmission medium formed in two parts optically in series with each other, wherein the optical output from the first end facet of the laser diode is optically coupled with the first part of the waveguided transmission medium while the optical output from the second end facet is optically coupled with the second part.
Claim 3
Dependent Claim
24 words
A diode-pumped optical fibre amplifier as claimed in claim 1, wherein the optically amplifying waveguided transmission medium takes the form of optically amplifying fibre.
Claim 4
Dependent Claim
47 words
A diode-pumped optical fibre amplifier as claimed in claim 1, wherein the optical outputs for the first end facet and the second end facet of a second injection laser diode are coupled with those of the first injection laser diode by means of two polarisation beam splitter/combiners.
Claim 5
Dependent Claim
24 words
A diode-pumped optical fibre amplifier as claimed in claim 3, wherein the optically amplifying waveguided transmission medium takes the form of optically amplifying fibre.
References Cited (Backward Citations)
US4699452A
Cited
EP0387075A1
Cited
US5058974A
Cited
EP0459685A2
Cited
GB2253514A
Cited
US5291326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-10 | 1998-04-11 | 1998-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-10 | 2002-04-11 | 2002-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-10 | 2006-04-11 | 2006-10-11 | $7700.00 | Window Closed / Lapsed |