US4658394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical transmission
Assignee: Nokia Bell Labs
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Filing: 1984-12-12
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Granted: 1987-04-14
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Expires: 2004-12-12
Abstract
Abstract An optical distribution architecture is disclosed wherein wavelength stabilized continuous wavelength lasers are centrally positioned in tandem with star couplers to distributed laser power among a plurality of lightguide paths. The laser power apportioned to each such path may then be locally or remotely modulated thereby reducing the number of lasers required to equip a network. Advantageously, lightguide fibres are single mode and polarization maintaining.
Inventors
- 👤 Steven S. Cheng
- 👤 Jan Lipson
- 👤 Stewart D. Personick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:02
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04B10/2587; H04B10/27; H04B10/272
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A short-haul optical transmission network comprising a source of coherent single mode continuous wave optical radiation, dividing means for dividing said single mode continuous wave optical radiation into m (m≧2) individual single mode output signals, external modulating means for modulating information onto at least some of said m individual single mode output signals, and a plurality of short-haul transmission paths each comprising a single mode optical fiber, each of said short-haul single mode optical fiber paths being adapted to transmit one of said m individual single mode output signals to a receiver station.
Claim 2
Dependent Claim
93 words
A short-haul optical transmission network comprising a source of coherent single mode continuous wave optical radiation, dividing means for dividing said single mode continuous wave optical radiation into m (m≧2) individual single mode output signals, external modulating means for modulating information onto at least some of said m individual single mode output signals, and a plurality of short-haul transmission paths each comprising a single mode optical fiber, each of said short-haul single mode optical fiber paths being adapted to transmit one of said m individual single mode output signals to a receiver station.
Claim 3
Dependent Claim
173 words
A short-haul optical transmission network comprising: a central office including: a first source of coherent single mode continuous wave optical radiation, operating at wavelength λ 1 , a second source of coherent single mode continuous wave optical radiation, operating at wavelength λ 2 , dividing means for dividing said wavelength λ 1 radiation into a plurality of individual single mode wavelength λ 1 signals and for dividing said wavelength λ 2 radiation into a plurality of individual single mode wavelength λ 2 signals, external modulating means for modulating information onto at least some of said individual wavelength λ 1 signals, and a plurality of multiplexing means, each of said multiplexing means being adapted to combine one of said individual wavelength λ 1 signals with one of said individual wavelength λ 2 signals to produce a combined signal, and a pluraity of short-haul transmission paths each comprising a single mode optical fiber, each of said single mode optical fiber transmission paths being adapted to transmit one of said combined signals to a receiver station.
Claim 4
Dependent Claim
173 words
A short-haul optical transmission network comprising: a central office including: a first source of coherent single mode continuous wave optical radiation, operating at wavelength λ 1 , a second source of coherent single mode continuous wave optical radiation, operating at wavelength λ 2 , dividing means for dividing said wavelength λ 1 radiation into a plurality of individual single mode wavelength λ 1 signals and for dividing said wavelength λ 2 radiation into a plurality of individual single mode wavelength λ 2 signals, external modulating means for modulating information onto at least some of said individual wavelength λ 1 signals, and a plurality of multiplexing means, each of said multiplexing means being adapted to combine one of said individual wavelength λ 1 signals with one of said individual wavelength λ 2 signals to produce a combined signal, and a pluraity of short-haul transmission paths each comprising a single mode optical fiber, each of said single mode optical fiber transmission paths being adapted to transmit one of said combined signals to a receiver station.
Claim 5
Dependent Claim
65 words
The transmission network of claim 2 further comprising means at said receiver station for separating said combined signal into modulated wavelength λ 1 radiation and unmodulated wavelength λ 2 radiation, means at said receiver station for detecting said wavelength λ 1 radiation, and means at said receiver station for modulating said wavelength λ 2 radiation with information to be transmitted back to said central office.
Claim 6
Dependent Claim
29 words
The transmission network of claim 3 wherein said modulated wavelength λ 2 radiation is transmitted back to said central office by means of a short-haul single mode optical fiber.
Claim 7
Dependent Claim
40 words
The transmission network of claim 4 wherein said wavelength λ 2 radiation is transmitted from said receiver station back to said central office by means of the same optical fiber used to transmit said combined signal to said receiver station.
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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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |