US4372643A
Expired / Lapsed
US
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Standing-wave, velocity-matched gate
Assignee: AT&T Inc
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Filing: 1980-06-23
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Granted: 1983-02-08
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Expires: 2000-06-23
Abstract
Abstract An ultrafast gate is produced by locally modulating the coupling along a pair of coupled wavepaths (11, 12) by means of a standing-wave electrical signal. By resolving the electrical signal into two, oppositely travelling waves propagating at the same velocity as the signal in the coupled wavepaths, it can be shown that the effect is to simulate an alternating Δβ coupler. It is further shown that side lobes in the output signal can be reduced by tapering the coupling along the coupling interval.
Inventors
- 👤 Pao-Lo P. Liu
- 👤 Enrique A. Marcatili
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:59
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/29; G02F1/31; G02F1/313; G02F1/3132; G02F1/3134
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
In combination, apparatus including: a pair of coupled optical wavepaths (11, 12 and 60, 61) and, means (20, 70), supportive of travelling electrical waves, for locally modulating the coupling between said wavepaths; Characterized in that said travelling wave means is terminated to produce a standing wave therealong.
Claim 2
Dependent Claim
47 words
In combination, apparatus including: a pair of coupled optical wavepaths (11, 12 and 60, 61) and, means (20, 70), supportive of travelling electrical waves, for locally modulating the coupling between said wavepaths; Characterized in that said travelling wave means is terminated to produce a standing wave therealong.
Claim 3
Dependent Claim
17 words
The combination according to claim 1 wherein said wavepaths (11, 12 and 60, 61) are optical waveguides.
Claim 4
Dependent Claim
27 words
The combination according to claim 2 wherein said optical wavepaths comprise a pair of substantially identical dielectric strips embedded in an electrooptic substrate of lower refractive index.
Claim 5
Dependent Claim
19 words
The combination according to claim 2 wherein said optical waveguides (11, 12) are uniformly spaced over their coupling interval.
Claim 6
Dependent Claim
28 words
The combination according to claim 2 wherein the space (z) between said optical waveguides (60, 61) varies as a function of the distance (x) along their coupling interval.
Claim 7
Dependent Claim
16 words
The combination according to claim 1 wherein said travelling wave means (20, 70) is reactively terminated.
Claim 8
Dependent Claim
21 words
The combination according to claim 6 wherein said travelling wave means (20) is terminated by means of a short circuit (16).
Claim 9
Dependent Claim
20 words
The combination according to claim 6 wherein said travelling wave means (70) is terminated by means of an open circuit.
Claim 10
Dependent Claim
21 words
The combination according to claim 1 wherein said travelling means includes a pair of conductive electrodes (14, 15 and 63, 64).
Claim 11
Dependent Claim
15 words
The combination according to claim 1 wherein said travelling wave means is a resonant circuit.
Claim 12
Dependent Claim
17 words
The combination according to claim 1 including a signal source (17) for energizing said travelling wave means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |