US5790292A
Expired / Lapsed
US
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Optical fiber transmission line
Assignee: Fujitsu Ltd
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Filing: 1995-10-02
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Granted: 1998-08-04
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Expires: 2015-10-02
Abstract
Abstract An optical fiber transmission line capable of suppressing the generation efficiency of four wave mixing in transmitting wavelength multiplex signal light. The transmission line employs a single mode optical fiber in which a zero dispersion wavelength is varied in the longitudinal direction of the optical fiber more largely than manufacturing variations in manufacturing conditions of the optical fiber. The use of this optical fiber as the transmission line suppresses the generation efficiency of four wave mixing in transmitting the wavelength multiplex signal light to allow the transmission of the wavelength multiplex signal light with a reduced crosstalk.
Inventors
- 👤 Kazue Otsuka
- 👤 Hiroshi Onaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:58
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/80; H04B10/85; H04B10/25; H04B10/2507; H04B10/2513; H04B10/2525; H04B10/2543; H04B10/2563
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
88 words
An optical fiber transmission line comprising: a single mode optical fiber in which a zero dispersion wavelength is varied in a longitudinal direction of said optical fiber more largely than manufacturing variations in manufacturing conditions of said optical fiber: said single mode optical fiber being constructed by alternately connecting an optical fiber continuously changing in dispersion value with respect to signal light to be transmitted and having a positive average dispersion value and an optical fiber continuously changing in dispersion value and having a negative average dispersion value.
Claim 2
Dependent Claim
88 words
An optical fiber transmission line comprising: a single mode optical fiber in which a zero dispersion wavelength is varied in a longitudinal direction of said optical fiber more largely than manufacturing variations in manufacturing conditions of said optical fiber: said single mode optical fiber being constructed by alternately connecting an optical fiber continuously changing in dispersion value with respect to signal light to be transmitted and having a positive average dispersion value and an optical fiber continuously changing in dispersion value and having a negative average dispersion value.
Claim 3
Dependent Claim
63 words
An optical fiber transmission line comprising: a single mode optical fiber in which a zero dispersion wavelength is varied in a longitudinal direction of said optical fiber more largely than manufacturing variations in manufacturing conditions of said optical fiber; wherein variations in said zero dispersion wavelength are periodic, and a dispersion value is continuously changed in the longitudinal direction of said optical fiber.
Claim 4
Dependent Claim
63 words
An optical fiber transmission line comprising: a single mode optical fiber in which a zero dispersion wavelength is varied in a longitudinal direction of said optical fiber more largely than manufacturing variations in manufacturing conditions of said optical fiber; wherein variations in said zero dispersion wavelength are periodic, and a dispersion value is continuously changed in the longitudinal direction of said optical fiber.
Claim 5
Dependent Claim
46 words
An optical fiber transmission line according to claim 2, wherein a lengthwise distribution of the variations in said zero dispersion wavelength has a shape selected from the group consisting of a triangular wave shape, a saw-toothed wave shape, a trigonometric function shape, and a random shape.
Claim 6
Dependent Claim
38 words
An optical fiber transmission line according to claim 1, wherein said optical fiber having the positive average dispersion value and said optical fiber having the negative average dispersion value are connected together so that total dispersion becomes zero.
Claim 7
Dependent Claim
23 words
An optical fiber transmission line according to claim 3, wherein an average of the variations in said zero dispersion wavelength is made zero.
Claim 8
Dependent Claim
137 words
An optical fiber communication system for transmitting wavelength division multiplexed signal light through an optical fiber transmission line, comprising: a single mode optical fiber in which a zero dispersion wavelength is varied in a longitudinal direction of said optical fiber more largely than manufacturing variations in manufacturing conditions of said optical fiber, said single mode optical fiber being constructed by alternately connecting an optical fiber continuously changing in dispersion value with respect to signal light to be transmitted and having a positive average dispersion value and an optical fiber continuously changing in dispersion value and having a negative average dispersion value; an optical transmitter connected to one end of said single mode optical fiber, for transmitting said wavelength division multiplexed signal light; and an optical receiver connected to the other end of said single mode optical fiber.
Claim 9
Dependent Claim
137 words
An optical fiber communication system for transmitting wavelength division multiplexed signal light through an optical fiber transmission line, comprising: a single mode optical fiber in which a zero dispersion wavelength is varied in a longitudinal direction of said optical fiber more largely than manufacturing variations in manufacturing conditions of said optical fiber, said single mode optical fiber being constructed by alternately connecting an optical fiber continuously changing in dispersion value with respect to signal light to be transmitted and having a positive average dispersion value and an optical fiber continuously changing in dispersion value and having a negative average dispersion value; an optical transmitter connected to one end of said single mode optical fiber, for transmitting said wavelength division multiplexed signal light; and an optical receiver connected to the other end of said single mode optical fiber.
Claim 10
Dependent Claim
175 words
An optical fiber communication system for transmitting wavelength division multiplexed signal light through an optical fiber transmission line, comprising: a first single mode optical fiber in which a zero dispersion wavelength is varied in a longitudinal direction of said optical fiber more largely than manufacturing variations in manufacturing conditions of said optical fiber, said single mode optical fiber being constructed by alternately connecting an optical fiber continuously changing in dispersion value with respect to signal light to be transmitted and having a positive average dispersion value and an optical fiber continuously changing in dispersion value and having a negative average dispersion value; a second single mode optical fiber having one end connected to one end of said first single mode optical fiber, said second single mode optical fiber having no intentional variations in zero dispersion wavelength; an optical transmitter connected to the other end of said first single mode optical fiber, for transmitting said wavelength division multiplexed signal light; and an optical receiver connected to the other end of said second single mode optical fiber.
Claim 11
Dependent Claim
175 words
An optical fiber communication system for transmitting wavelength division multiplexed signal light through an optical fiber transmission line, comprising: a first single mode optical fiber in which a zero dispersion wavelength is varied in a longitudinal direction of said optical fiber more largely than manufacturing variations in manufacturing conditions of said optical fiber, said single mode optical fiber being constructed by alternately connecting an optical fiber continuously changing in dispersion value with respect to signal light to be transmitted and having a positive average dispersion value and an optical fiber continuously changing in dispersion value and having a negative average dispersion value; a second single mode optical fiber having one end connected to one end of said first single mode optical fiber, said second single mode optical fiber having no intentional variations in zero dispersion wavelength; an optical transmitter connected to the other end of said first single mode optical fiber, for transmitting said wavelength division multiplexed signal light; and an optical receiver connected to the other end of said second single mode optical fiber.
Claim 12
Dependent Claim
33 words
An optical fiber communication system according to claim 6, wherein variations in said zero dispersion wavelength are periodic, and a dispersion value is continually changed in the longitudinal direction of said optical fiber.
Claim 13
Dependent Claim
33 words
An optical fiber communication system according to claim 7, wherein variations in said zero dispersion wavelength are periodic, and a dispersion value is continually changed in the longitudinal direction of said optical fiber.
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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) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |