US3723921A
Expired / Lapsed
US
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Multimode waveguide with reduced dispersion
Assignee: AT&T Inc
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Filing: 1971-05-14
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Granted: 1973-03-27
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Expires: 1991-05-14
Abstract
Abstract Transmission performance of a multimode waveguide is optimized (i.e., pulse dispersion is minimized) by optimizing the coupling among the different modes. More specifically, in a waveguide supportive of modes having group velocities v1 and v2, and wherein the coupling mechanism comprises random discontinuities having an essentially white spectrum, optimum coupling is defined by an optimum coupling length Lopt given by
Inventors
- 👤 H Rowe
- 👤 D Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:31
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04B10/2581; H01; H01P; H01P1/00; H01P1/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
In a waveguide capable of guidiNg wave energy at a frequency of interest f in a plurality of different modes of wave propagation having two different group velocities v1 and V2: random coupling means uniformly distributed along said guide for coupling wave energy among said different modes where; said coupling varies substantially inversely as a function of frequency; and where the coupling length is given by
Claim 2
Dependent Claim
66 words
In a waveguide capable of guidiNg wave energy at a frequency of interest f in a plurality of different modes of wave propagation having two different group velocities v1 and V2: random coupling means uniformly distributed along said guide for coupling wave energy among said different modes where; said coupling varies substantially inversely as a function of frequency; and where the coupling length is given by
Claim 3
Dependent Claim
12 words
The waveguide according to claim 1 adapted to guide optical wave energy.
Claim 4
Dependent Claim
18 words
The waveguide according to claim 1 wherein said coupling means includes changes in the diameter of said guide.
Claim 5
Dependent Claim
19 words
The waveguide according to claim 1 wherein said coupling means includes changes in the position of the guide axis.
References Cited (Backward Citations)
US3157726A
Cited
US3259903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |