US5587830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High capacity optical fiber network
Assignee: Nokia of America Corp
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Filing: 1993-05-28
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Granted: 1996-12-24
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Expires: 2013-05-28
Abstract
Abstract A high capacity optical fiber network operative with wavelength division multiplexing. Contemplated systems can utilize span distances in excess of 100 km, signal amplification within spans, and provide plural multiplexed channels operative at multiple gigabits per second.
Inventors
- 👤 Andrew R. Chraplyvy
- 👤 Robert W. Tkach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:09
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04B10/2507; H04B10/2513; H04B10/2525; H04B10/2543; H04B10/255; H04B10/2563
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
Wavelength division multiplexed optical waveguide system including: a transmitter for generating, modulating, and multiplexing modulated channel carriers for introduction into a transmission line, the transmitter being characterized by a "system wavelength" of magnitude within the wavelength range of the grouped channel carriers; a receiver for performing functions including de-multiplexing modulated channel carriers; optical amplifiers; and a transmission line of optical fiber including at least one fiber span defined at one end by a transmitter and at the other end by a receiver, in which the span includes at least one optical amplifier CHARACTERIZED IN THAT substantially all fiber defining the span has a chromatic dispersion of an absolute value in the range 1.5-4 ps/nm-km at the system wavelength.
Claim 2
Dependent Claim
118 words
Wavelength division multiplexed optical waveguide system including: a transmitter for generating, modulating, and multiplexing modulated channel carriers for introduction into a transmission line, the transmitter being characterized by a "system wavelength" of magnitude within the wavelength range of the grouped channel carriers; a receiver for performing functions including de-multiplexing modulated channel carriers; optical amplifiers; and a transmission line of optical fiber including at least one fiber span defined at one end by a transmitter and at the other end by a receiver, in which the span includes at least one optical amplifier CHARACTERIZED IN THAT substantially all fiber defining the span has a chromatic dispersion of an absolute value in the range 1.5-4 ps/nm-km at the system wavelength.
Claim 3
Dependent Claim
13 words
System of claim 1 in which the system wavelength is approximately 1550 nm.
Claim 4
Dependent Claim
18 words
System of claim 2 in which substantially all fiber defining the span is of substantially uniform chromatic dispersion.
Claim 5
Dependent Claim
12 words
System of claim 3 in which the chromatic dispersion is ≧2 ps/nm-km.
Claim 6
Dependent Claim
36 words
System of claim 2 in which average linear dispersion of fiber defining the span is equalized to a magnitude of approximately zero by inclusion of at least two lengths of fiber of different signs of dispersion.
Claim 7
Dependent Claim
30 words
System of claim 5 in which substantially all fiber defining the span is of uniform chromatic dispersion ≧2 ps/nm-km, and in which equalization is due to inclusion of compensating fiber.
Claim 8
Dependent Claim
13 words
System of claim 2 in which optical amplifiers are composed of erbium-doped silica.
Claim 9
Dependent Claim
15 words
System of claim 7 in which extreme wavelengths of channels define a spectrum ≦20 nm.
Claim 10
Dependent Claim
17 words
System in accordance with claim 8 using at least four channels which are spaced by 0.8-4 nm.
Claim 11
Dependent Claim
20 words
System of claim 1 in which a substantial length of fiber within a span has a λ 0 ≅1550 nm.
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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) | 1999-12-24 | 2000-06-24 | 2000-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-24 | 2004-06-24 | 2004-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-24 | 2008-06-24 | 2008-12-24 | $7700.00 | Window Closed / Lapsed |