US5357364A
Expired / Lapsed
US
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Soliton transmission system having sliding-frequency guiding filters
Assignee: Nokia Bell Labs
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Filing: 1992-06-25
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Granted: 1994-10-18
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Expires: 2012-06-25
Abstract
Abstract Timing jitter problems are effectively eliminated in a soliton transmission system realized in accordance with the principles of the present invention by deploying optical filters whose center frequency intentionally differs from the center frequency of adjacent optical filters. The center frequency of the series of optical filters is translated along the desired length of the system in a predetermined manner such as frequency increasing, frequency decreasing, and combinations of both to create a transmission environment which is substantially opaque to noise while remaining perfectly transparent to solitons.
Inventors
- 👤 James P. Gordon
- 👤 Linn F. Mollenauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:25
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04B10/2507; H04B10/25077
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
99 words
A lightwave transmission system supporting soliton propagation in a particular band of frequencies and comprising an optical fiber transmission medium including both a plurality of optical amplifiers spaced apart along the optical fiber transmission medium and a plurality of optical filters spaced apart along the optical fiber transmission medium, the lightwave transmission system CHARACTERIZED IN THAT, each optical filter exhibits a nominal center frequency substantially different from the nominal center frequency of each other optical filter to move the frequency of the soliton toward its nominal center frequency, each nominal center frequency being in the particular band of frequencies.
Claim 2
Dependent Claim
99 words
A lightwave transmission system supporting soliton propagation in a particular band of frequencies and comprising an optical fiber transmission medium including both a plurality of optical amplifiers spaced apart along the optical fiber transmission medium and a plurality of optical filters spaced apart along the optical fiber transmission medium, the lightwave transmission system CHARACTERIZED IN THAT, each optical filter exhibits a nominal center frequency substantially different from the nominal center frequency of each other optical filter to move the frequency of the soliton toward its nominal center frequency, each nominal center frequency being in the particular band of frequencies.
Claim 3
Dependent Claim
35 words
The lightwave transmission system as defined in claim 1 wherein the nominal center frequencies of the plurality of optical filters increase substantially monotonically as a function of distance over the length of the transmission medium.
Claim 4
Dependent Claim
35 words
The lightwave transmission system as defined in claim 1 wherein the nominal center frequencies of the plurality of optical filters decrease substantially monotonically as a function of distance over the length of the transmission medium.
Claim 5
Dependent Claim
46 words
The lightwave transmission system as defined in claim 1 wherein the nominal center frequencies of the plurality of optical filters are disposed in a substantially staggered pattern, alternately increasing and decreasing about a mean as a function of distance over the length of the transmission medium.
Claim 6
Dependent Claim
158 words
A lightwave transmission system supporting soliton propagation in a particular band of frequencies and comprising an optical fiber transmission medium including both a plurality of optical amplifiers spaced apart along the optical fiber transmission medium and a plurality of optical filters spaced apart along the optical fiber transmission medium, the lightwave transmission system CHARACTERIZED IN THAT, each optical filter exhibits a nominal center frequency substantially different from the nominal center frequency of each other optical filter to move the frequency of the soliton toward its nominal center frequency, each nominal center frequency being in the particular band of frequencies and wherein, over at least a portion of the transmission system, the center frequencies of the plurality of optical filters changes from a first frequency to a second frequency at a rate less than or equal to approximately (2/27) 1/2 η, where η describes curvature per unit soliton length of a parabolically-shaped filter response around the nominal center frequency.
Claim 7
Dependent Claim
158 words
A lightwave transmission system supporting soliton propagation in a particular band of frequencies and comprising an optical fiber transmission medium including both a plurality of optical amplifiers spaced apart along the optical fiber transmission medium and a plurality of optical filters spaced apart along the optical fiber transmission medium, the lightwave transmission system CHARACTERIZED IN THAT, each optical filter exhibits a nominal center frequency substantially different from the nominal center frequency of each other optical filter to move the frequency of the soliton toward its nominal center frequency, each nominal center frequency being in the particular band of frequencies and wherein, over at least a portion of the transmission system, the center frequencies of the plurality of optical filters changes from a first frequency to a second frequency at a rate less than or equal to approximately (2/27) 1/2 η, where η describes curvature per unit soliton length of a parabolically-shaped filter response around the nominal center frequency.
Claim 8
Dependent Claim
108 words
A lightwave transmission system supporting soliton propagation in a particular band of frequencies and comprising an optical fiber transmission medium including both optical means for amplifying solitons in the particular band propagating along the optical fiber transmission medium and optical means for filtering solitons in the particular band propagating along the optical fiber transmission medium, the lightwave transmission system CHARACTERIZED IN THAT, the optical means for filtering further includes filter means for translating the solitons adiabatically along the transmission medium from a first frequency to a second frequency, different from the first frequency, so that the solitons are separated in frequency from noise generated by the amplifying means.
Claim 9
Dependent Claim
108 words
A lightwave transmission system supporting soliton propagation in a particular band of frequencies and comprising an optical fiber transmission medium including both optical means for amplifying solitons in the particular band propagating along the optical fiber transmission medium and optical means for filtering solitons in the particular band propagating along the optical fiber transmission medium, the lightwave transmission system CHARACTERIZED IN THAT, the optical means for filtering further includes filter means for translating the solitons adiabatically along the transmission medium from a first frequency to a second frequency, different from the first frequency, so that the solitons are separated in frequency from noise generated by the amplifying means.
Claim 10
Dependent Claim
32 words
The lightwave transmission system as defined in claim 6 wherein magnitude of the difference between the first and second frequencies is greater than or equal to one-half the bandwidth of the soliton.
Claim 11
Independent Claim
65 words
A method for soliton propagation in a lightwave transmission system comprising the steps of: amplifying solitons at a plurality of locations along the system; and filtering the solitons at a plurality of locations along the system to translate the solitons to a second frequency different from a soliton launch frequency so that the solitons are separated in frequency from noise generated by the amplifying step.
Claim 12
Independent Claim
65 words
A method for soliton propagation in a lightwave transmission system comprising the steps of: amplifying solitons at a plurality of locations along the system; and filtering the solitons at a plurality of locations along the system to translate the solitons to a second frequency different from a soliton launch frequency so that the solitons are separated in frequency from noise generated by the amplifying step.
Claim 13
Independent Claim
125 words
A method for soliton propagation in a lightwave transmission system comprising the steps of: amplifying solitons at a plurality of locations along the system; and filtering the solitons at a plurality of locations along the system to translate the solitons to a second frequency different from a soliton launch frequency so that the solitons are separated in frequency from noise generated by the amplifying step and wherein the filtering occurs at different nominal center frequencies along at least a portion of the length of the system so that the rate of change of frequency versus system length is less than or equal to approximately (2/27) 1/2 η, where η describes curvature per unit soliton length of a parabolically-shaped filter response around the nominal center frequency.
Claim 14
Independent Claim
125 words
A method for soliton propagation in a lightwave transmission system comprising the steps of: amplifying solitons at a plurality of locations along the system; and filtering the solitons at a plurality of locations along the system to translate the solitons to a second frequency different from a soliton launch frequency so that the solitons are separated in frequency from noise generated by the amplifying step and wherein the filtering occurs at different nominal center frequencies along at least a portion of the length of the system so that the rate of change of frequency versus system length is less than or equal to approximately (2/27) 1/2 η, where η describes curvature per unit soliton length of a parabolically-shaped filter response around the nominal center frequency.
References Cited (Backward Citations)
US5117303A
Cited
US5140656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |