US5020050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cascadable optical combinatorial logic gates
Assignee: Nokia Bell Labs
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Filing: 1989-10-13
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Granted: 1991-05-28
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Expires: 2009-10-13
Abstract
Abstract Combinatorial logic devices are presented in which data signals interact with an enable signal in the device to move the enable signal outside its prescribed time slot when one or both of the data signals are present. Data signals are discarded within the device to avoid propagation through subsequent logic device stages. Such logic devices are particularly well suited to all-optical realizations in which soliton pulse signals are used. These devices exhibit high gain, cascadability and potentially large fanout capability.
Inventors
- 👤 Mohammed N. Islam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:27
CPC Classifications
G; G02; G02F; G02F3/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
89 words
An optical combinatorial logic device comprising means for generating an enable signal in a prescribed time slot, said time slot substantially corresponding to a pulse width of said enable signal, means responsive to at least a first data signal for combining said enable signal with said at least first data signal in a prescribed relationship, and means coupled to said signal combining means for substantially removing said enable signal from said prescribed time slot at an output of said device when said at least first data signal is present.
Claim 2
Dependent Claim
89 words
An optical combinatorial logic device comprising means for generating an enable signal in a prescribed time slot, said time slot substantially corresponding to a pulse width of said enable signal, means responsive to at least a first data signal for combining said enable signal with said at least first data signal in a prescribed relationship, and means coupled to said signal combining means for substantially removing said enable signal from said prescribed time slot at an output of said device when said at least first data signal is present.
Claim 3
Dependent Claim
32 words
The optical combinatorial logic device defined in claim 1 further comprising means coupled to an output of said signal removing means for inhibiting further propagation of said at least first data signal.
Claim 4
Dependent Claim
27 words
The optical combinatorial logic device defined in claim 2 further comprising means coupled to said inhibiting means for replicating an output signal from said prescribed time slot.
Claim 5
Dependent Claim
92 words
An optical combinatorial logic device comprising means for generating an enable signal in a prescribed time slot, said time slot substantially corresponding to a pulse width of said enable signal, means responsive to at least a first data signal for combining said enable signal with said at least first data signal in a prescribed relationship, and means coupled to said signal combining means for moving said enable signal to a time slot neighboring said prescribed time slot at an output of said device when said at least first data signal is present.
Claim 6
Dependent Claim
92 words
An optical combinatorial logic device comprising means for generating an enable signal in a prescribed time slot, said time slot substantially corresponding to a pulse width of said enable signal, means responsive to at least a first data signal for combining said enable signal with said at least first data signal in a prescribed relationship, and means coupled to said signal combining means for moving said enable signal to a time slot neighboring said prescribed time slot at an output of said device when said at least first data signal is present.
Claim 7
Dependent Claim
32 words
The optical combinatorial logic device defined in claim 4 further comprising means coupled to an output of said signal moving means for inhibiting further propagation of said at least first data signal.
Claim 8
Dependent Claim
27 words
The optical combinatorial logic device defined in claim 5 further comprising means coupled to said inhibiting means for replicating an output signal from said prescribed time slot.
Claim 9
Dependent Claim
94 words
An optical combinatorial logic device comprising means for generating an enable signal in a prescribed time slot, said time slot substantially corresponding to a pulse width of said enable signal, means responsive to first and second data signals for combining said enable signal with said first and second data signals in a prescribed relationship, and means coupled to said signal combining means for substantially removing said enable signal from said prescribed time slot at an output of said device when said first data signal is present or when said second data signal is present.
Claim 10
Dependent Claim
94 words
An optical combinatorial logic device comprising means for generating an enable signal in a prescribed time slot, said time slot substantially corresponding to a pulse width of said enable signal, means responsive to first and second data signals for combining said enable signal with said first and second data signals in a prescribed relationship, and means coupled to said signal combining means for substantially removing said enable signal from said prescribed time slot at an output of said device when said first data signal is present or when said second data signal is present.
Claim 11
Dependent Claim
31 words
The combinatorial logic device defined in claim 7 further comprising means coupled to an output of said signal removing means for inhibiting further propagation of said first and second data signals.
Claim 12
Dependent Claim
68 words
The optical combinatorial logic device defined in claim 7 wherein said first and second data signals and said enable signal are optical signals capable of soliton propagation in said removing means, said first and second data signals having substantially equal amplitudes at a level less than an amplitude of said enable signal, and said enable signal being polarized orthogonal to both said first and said second data signals.
Claim 13
Dependent Claim
21 words
The optical combinatorial logic device defined in claim 9 wherein said removing means includes a prescribed length of birefringent optical fiber.
Claim 14
Dependent Claim
60 words
The optical combinatorial logic device defined in claim 10 wherein said enable signal propagates along a fast axis of said birefringent optical fiber and wherein said first and second data signals propagate along a slow axis of said birefringent optical fiber, said first and second data signals being positioned to substantially overlap said enable signal in said prescribed time slot.
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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |