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Patent US5317660A successfully refreshed from Google Patents.
US5317660A
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US
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Optical transmission system with optical filter for providing protection against giant pulses
Assignee: Alcatel Lucent Deutschland AG
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Filing: 1993-06-21
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Granted: 1994-05-31
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Expires: 2013-06-21
Abstract
Abstract In optical transmission systems with fiber-optic amplifiers, an interruption of the fiber-optic link, e.g., due to fiber breakage, may cause a giant pulse to develop. To prevent the giant pulse from propagating in the fiber-optic link, an optical filter (7) which blocks the wavelength region of the pulse is placed in the fiber-optic link. The wavelength of the optical signal must be chosen to lie outside the wavelength region of the maximum gain of the fiber-optic amplifier.
Inventors
- 👤 Gustav Veith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:57
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/29; H04B10/291; H04B10/2912
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
An optical transmission system for transmitting an optical signal over an optical waveguide containing at least one fiber-optic amplifier, wherein the wavelength of the optical signal lies outside the wavelength region of the maximum gain of the fiber-optic amplifier, and that an optical filter having a stop band in the wavelength region of the maximum gain of the fiber-optic amplifier is provided before or after at least one fiber-optic amplifier.
Claim 2
Dependent Claim
70 words
An optical transmission system for transmitting an optical signal over an optical waveguide containing at least one fiber-optic amplifier, wherein the wavelength of the optical signal lies outside the wavelength region of the maximum gain of the fiber-optic amplifier, and that an optical filter having a stop band in the wavelength region of the maximum gain of the fiber-optic amplifier is provided before or after at least one fiber-optic amplifier.
Claim 3
Dependent Claim
19 words
An optical transmission system as claimed in claim 1, wherein the optical filter is a wavelength-selective fused fiber coupler.
Claim 4
Dependent Claim
29 words
An optical transmission system as claimed in claim 1, wherein the optical filter is a length of optical waveguide made of an absorbing material with a narrow absorption band.
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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) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |