US5078464A
Expired / Lapsed
US
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Optical logic device
Assignee: Nokia Bell Labs
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Filing: 1990-11-07
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Granted: 1992-01-07
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Expires: 2010-11-07
Abstract
Abstract An optical logic device based on the time-shift-keying architecture is described in which digital logic functions are realized by applying appropriate signal pulses to a nonlinear shift or "chirp" element whose output is supplied to a dispersive element capable of supporting soliton propagation. In an optical fiber realization of the optical logic device, two orthogonally polarized pulses are supplied to the combination of a moderately birefringent fiber acting as the nonlinear chirp element and a polarization maintaining fiber acting as the soliton dispersive delay element having a anomolous group velocity dispersion at the signal wavelengths of interest. A nonlinear frequency shift is created in one of the pulses in the former element through cross-phase modulation and, in turn, the frequency shift is translated into a temporal shift of the affected pulse in the latter element. These devices operate at switching energies approaching 1pJ.
Inventors
- 👤 Mohammed N. Islam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:26
CPC Classifications
G; G02; G02F; G02F3/00; G02F1/00; G02F1/35; G02F1/3511; G02F1/3513
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
142 words
An optical logic device comprising means responsive to at least a first data signal and a control signal for combining said control signal with said at least first data signal in a prescribed relationship, said control signal occurring in a prescribed time slot, said time slot substantially corresponding to a pulse width of said control signal, means connected at an output of said combining means for inducing a nonlinear frequency shift of said control signal in response to said at least first data signal, and means coupled to said frequency shift inducing means for supporting soliton propagation therethrough and for translating said nonlinear frequency shift into a corresponding time shift of said control signal so that said control signal is substantially removed from said prescribed time slot at an output of said device when said at least first data signal is present.
Claim 2
Dependent Claim
142 words
An optical logic device comprising means responsive to at least a first data signal and a control signal for combining said control signal with said at least first data signal in a prescribed relationship, said control signal occurring in a prescribed time slot, said time slot substantially corresponding to a pulse width of said control signal, means connected at an output of said combining means for inducing a nonlinear frequency shift of said control signal in response to said at least first data signal, and means coupled to said frequency shift inducing means for supporting soliton propagation therethrough and for translating said nonlinear frequency shift into a corresponding time shift of said control signal so that said control signal is substantially removed from said prescribed time slot at an output of said device when said at least first data signal is present.
Claim 3
Dependent Claim
30 words
The optical logic device defined in claim 1 further comprising means coupled to an output of said translating means for inhibiting further propagation of said at least first data signal.
Claim 4
Dependent Claim
51 words
The optical logic device as defined in claim 1 wherein said nonlinear frequency shift inducing means includes a prescribed length of moderately birefringent optical fiber and wherein said translating means includes a prescribed length of polarization maintaining fiber exhibiting anomalous group velocity dispersion at a wavelength related to said control signal.
Claim 5
Dependent Claim
165 words
An optical logic device comprising means responsive to at least a first data signal and a control signal for combining said control signal with said at least first data signal in a prescribed relationship, said control signal occurring in a prescribed time slot, said time slot substantially corresponding to a pulse width of said control signal, means connected at an output of said combining means for inducing a nonlinear frequency shift of said control signal in response to said at least first data signal, and means coupled to said frequency shift inducing means for supporting soliton propagation therethrough and for translating said nonlinear frequency shift into a corresponding time shift of said control signal so that said control signal is moved to a time slot neighboring said prescribed time slot at an output of said device when said at least first data signal is present. From said prescribed time slot at an output of said device when said at least first data signal is present.
Claim 6
Dependent Claim
165 words
An optical logic device comprising means responsive to at least a first data signal and a control signal for combining said control signal with said at least first data signal in a prescribed relationship, said control signal occurring in a prescribed time slot, said time slot substantially corresponding to a pulse width of said control signal, means connected at an output of said combining means for inducing a nonlinear frequency shift of said control signal in response to said at least first data signal, and means coupled to said frequency shift inducing means for supporting soliton propagation therethrough and for translating said nonlinear frequency shift into a corresponding time shift of said control signal so that said control signal is moved to a time slot neighboring said prescribed time slot at an output of said device when said at least first data signal is present. From said prescribed time slot at an output of said device when said at least first data signal is present.
Claim 7
Dependent Claim
30 words
The optical logic device defined in claim 4 further comprising means coupled to an output of said translating means for inhibiting further propagation of said at least first data signal.
Claim 8
Dependent Claim
51 words
The optical logic device as defined in claim 4 wherein said nonlinear frequency shift inducing means includes a prescribed length of moderately birefringent optical fiber and wherein said translating means includes a prescribed length of polarization maintaining fiber exhibiting anomalous group velocity dispersion at a wavelength related to said control signal.
Claim 9
Dependent Claim
151 words
An optical logic device comprising means responsive to at least first and second data signals and a control signal for combining said control signal with said at least first and second data signals in a prescribed relationship, said control signal occurring in a prescribed time slot, said time slot substantially corresponding to a pulse width of said control signal, means connected at an output of said combining means for inducing a nonlinear frequency shift of said control signal in response to said at least first data signal, and means coupled to said frequency shift inducing means for supporting soliton propagation therethrough and for translating said nonlinear frequency shift into a corresponding time shift of said control signal so that said control signal is substantially removed 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
151 words
An optical logic device comprising means responsive to at least first and second data signals and a control signal for combining said control signal with said at least first and second data signals in a prescribed relationship, said control signal occurring in a prescribed time slot, said time slot substantially corresponding to a pulse width of said control signal, means connected at an output of said combining means for inducing a nonlinear frequency shift of said control signal in response to said at least first data signal, and means coupled to said frequency shift inducing means for supporting soliton propagation therethrough and for translating said nonlinear frequency shift into a corresponding time shift of said control signal so that said control signal is substantially removed 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
30 words
The optical logic device defined in claim 7 further comprising means coupled to an output of said translating means for inhibiting further propagation of said first and second data signals.
Claim 12
Dependent Claim
66 words
The optical logic device defined in claim 7 wherein at least said control signal is an optical signal having sufficient characteristics for achieving soliton propagation in said translating means, said first and second data signals having substantially equal amplitudes at a level less than an amplitude of said control signal, and said control signal being polarized orthogonal to both said first and said second data signals.
Claim 13
Dependent Claim
50 words
The optical logic device defined in claim 9 wherein said nonlinear frequency shift inducing means includes a prescribed length of moderately birefringent optical fiber and wherein said translating means includes a prescribed length of polarization maintaining fiber exhibiting anomalous group velocity dispersion at a wavelength related to said control signal.
Claim 14
Dependent Claim
70 words
The optical logic device defined in claim 10 wherein said control 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 in a predetermined temporal relationship to interact with said control signal via cross-phase modulation effects in said nonlinear frequency shift inducing means.
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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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |