US5301054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission of AM-VSB video signals over an optical fiber
Assignee: Corning Inc
•
Filing: 1993-01-14
•
Granted: 1994-04-05
•
Expires: 2013-01-14
Abstract
Abstract The use of a doped optical fiber amplifier enables the transmission of multi-channel AM-VSB television signals. An Erbium doped fiber amplifier is disclosed. The amplifier is also useful for reducing second order distortion products produced in an amplitude modulated subcarrier optical communication system. The amplifier may be used in a tree and branch structure optical fiber television network.
Inventors
- 👤 David R. Huber
- 👤 Douglas W. Hall
- 👤 Edward F. Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:32
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/27; H04B10/272; H04B10/29; H04B10/291; H04B10/2912
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
Apparatus for communicating amplitude modulated vestigial-sideband (AM-VSB) signals over an optical communication path comprising: a light source for providing light at a wavelength λ; means for modulating light from said source by an AM-VSB signal; means for optically amplifying the modulated light in an optical amplifier other than a semiconductor optical amplifier, said optical amplifier exhibiting gain at said wavelength λ and producing only minimal distortion that is tolerable for AM-VSB signal distribution; and means for introducing the amplified modulated light output from said optical amplifier to an optical communication fiber.
Claim 2
Dependent Claim
91 words
Apparatus for communicating amplitude modulated vestigial-sideband (AM-VSB) signals over an optical communication path comprising: a light source for providing light at a wavelength λ; means for modulating light from said source by an AM-VSB signal; means for optically amplifying the modulated light in an optical amplifier other than a semiconductor optical amplifier, said optical amplifier exhibiting gain at said wavelength λ and producing only minimal distortion that is tolerable for AM-VSB signal distribution; and means for introducing the amplified modulated light output from said optical amplifier to an optical communication fiber.
Claim 3
Dependent Claim
15 words
Apparatus in accordance with claim 1 wherein said optical amplifier is an optical fiber amplifier.
Claim 4
Dependent Claim
18 words
Apparatus in accordance with claim 1 wherein said optical amplifier is a rare earth doped optical fiber amplifier.
Claim 5
Dependent Claim
17 words
Apparatus in accordance with claim 1 wherein said optical amplifier is a rare earth doped optical amplifier.
Claim 6
Dependent Claim
16 words
Apparatus in accordance with claim 1 wherein said optical amplifier is an erbium doped optical amplifier.
Claim 7
Dependent Claim
17 words
Apparatus in accordance with claim 1 wherein said optical amplifier is an erbium doped optical fiber amplifier.
Claim 8
Dependent Claim
33 words
Apparatus in accordance with claim 1 wherein said modulating means are adapted to modulate said light by a television signal containing a plurality of AM-VSB subcarriers, each corresponding to a different television channel.
Claim 9
Dependent Claim
13 words
Apparatus in accordance with claim 1 wherein said light source is a laser.
Claim 10
Dependent Claim
40 words
Apparatus in accordance with claim 1 wherein said optical amplifier comprises: a doped amplifying fiber; means for inputting said modulated light to said doped amplifying fiber; and means for inputting light from a pump laser to said doped amplifying fiber.
Claim 11
Dependent Claim
17 words
Apparatus in accordance with claim 9 wherein said amplifying fiber is doped with a rare earth element.
Claim 12
Dependent Claim
13 words
Apparatus in accordance with claim 10 wherein said rare earth element is erbium.
References Cited (Backward Citations)
US4959837A
Cited
US5210631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |