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Patent US5473719A successfully refreshed from Google Patents.
US5473719A
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US
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Optical dispersion compensator
Assignee: AT&T Inc
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Filing: 1994-09-19
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Granted: 1995-12-05
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Expires: 2014-09-19
Abstract
Abstract Pulse broadening in a single mode optical transmission system due to wavelength dispersion is reduced by separating the different wavelength components and selectively delaying them. Upon recombination, the original phases of the wavelength components are restored, and the pulses narrowed. By using exclusively single mode devices, essentially lossless operation is realized.
Inventors
- 👤 Julian Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:50
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/12007; G02B6/12009; G02B6/12011; G02B6/12019; H; H04; H04B; H04B10/00; H04B10/25; H04B10/2507; H04B10/2513; H04B10/25133; H04B10/2525; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29301; G02B6/29304; G02B6/29305; G02B6/2931; G02B6/29379; G02B6/29392; G02B6/29394; H04B2210/00; H04B2210/25; H04B2210/258
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
A dispersion compensator comprising: a single mode input demultiplexer; a single mode output multiplexer; and a plurality of different single mode delay lines connecting the output ports of said demultiplexer to the input ports of said multiplexer.
Claim 2
Dependent Claim
37 words
A dispersion compensator comprising: a single mode input demultiplexer; a single mode output multiplexer; and a plurality of different single mode delay lines connecting the output ports of said demultiplexer to the input ports of said multiplexer.
Claim 3
Dependent Claim
45 words
A dispersion compensator comprising: single mode input means for separating an input signal into its wavelength components; separate means for selectively delaying each of said wavelength components different lengths of time; and single mode output means for recombining said delayed components in a common wavepath.
Claim 4
Dependent Claim
45 words
A dispersion compensator comprising: single mode input means for separating an input signal into its wavelength components; separate means for selectively delaying each of said wavelength components different lengths of time; and single mode output means for recombining said delayed components in a common wavepath.
Claim 5
Dependent Claim
17 words
The compensator according to claim 2 wherein shorter wavelength components are delayed longer than longer wavelength components.
Claim 6
Dependent Claim
61 words
The compensator according to claim 2 wherein said input means includes: a star coupler having an input port and a plurality of output ports connected to an equal plurality of wavelength filters; and wherein: said output means comprises a star coupler having a plurality of input ports coupled to said delay means; and an output port coupled to said common wavepath.
Claim 7
Dependent Claim
18 words
The compensator according to claim 2 wherein: said separate means are single mode optical fibers of different lengths.
Claim 8
Dependent Claim
87 words
A dispersion compensator comprising: an input star coupler having an input port and a plurality of output ports, and an output star coupler having a plurality of input ports and an output port; and a plurality of wavepaths connecting each output port of said input star coupler to an input port of said output star coupler; each wavepath including a wavelength filter tuned to a different bandpass and a section of delay line having a delay different from the delays associated with the other of said wavepaths.
Claim 9
Dependent Claim
87 words
A dispersion compensator comprising: an input star coupler having an input port and a plurality of output ports, and an output star coupler having a plurality of input ports and an output port; and a plurality of wavepaths connecting each output port of said input star coupler to an input port of said output star coupler; each wavepath including a wavelength filter tuned to a different bandpass and a section of delay line having a delay different from the delays associated with the other of said wavepaths.
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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) | 1998-12-04 | 1999-06-05 | 1999-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-04 | 2003-06-05 | 2003-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-04 | 2007-06-05 | 2007-12-05 | $7700.00 | Window Closed / Lapsed |